2010
Prince Edward Island Department of Education
and Early Childhood Development
P.O. Box 2000, Charlottetown
Prince Edward Island
Canada, C1A 7N8
Tel. (902) 368-4600
Fax. (902) 368-4622
http://www.gov.pe.ca/eecd/
Welding Technology
Gas Tungsten Arc Welding (GTAW) (WEL801E)
Course Description
Gas tungsten arc welding is a precise method of welding various types of metal. GTAW is a process
widely used in the welding fabrication industry. During this course students will learn to identify,
describe, and safely use the equipment and tools required to perform GTAW welds in a variety of
positions on various types of metal.
Classroom Component—Suggested time: 19 hours
This component of the curriculum is required to teach the knowledge and skills associated with the
learning outcomes of the curriculum.
Skill Development Component—Suggested time: 91 hours
This component of the curriculum is required by the student to apply the knowledge and develop the
skills related to the learning outcomes of the curriculum.
SCO - Identifies the Specific Curriculum Outcome (SCO)
Column 1
SCO - Delineations
Describes what the students are expected to
know, be able to do, and value in order to
achieve the SCO.
The teacher is responsible for the planning
and facilitation of learning as well as the
assessment of each SCO - Delineation.
Column 3
Teacher Lessons / Demonstrations
Provides suggestions for developing and
delivering the content for student learning.
Student Activities / Assessments
Provides suggestions for creating
meaningful activities to allow the student
to achieve the SCO.
Column 2
Student Knowledge, Abilities and Competencies
Provides clarity to the SCO by describing the knowledge,
abilities, and competencies that the students develop. This
column is designed to indicate the depth and breadth of the SCO.
It is not necessary to use all of these suggestions or that all of the
students be engaged in the same learning activity.
Column 4
Resources
Lists a variety of resources that support the teaching and learning
related to the SCO. These resources are suggested to support the
teacher in developing an effective instructional package for delivery
to the students.
1
CURRICULUM OUTCOMES
Module 1: Materials Handling (~10 hours Classroom Component)
28.
Students will be able to apply safe procedures for handling materials.
Students will be expected to
28.1
identify safe procedures for handling and storing materials
28.2
determine weight and centre of gravity of loads
28.3
describe the effect that sling angles have on safe lifting
28.4
identify the load limits of commonly used wire rope slings and synthetic slings
28.5
describe the causes and effects of shock loading on rigging
28.6
identify relevant Occupational Health and Safety Regulations
28.7
identify and use hand signals for crane operations
28.8
describe safe procedures for lifting, hoisting, and moving loads
28.9
describe the purpose and use of knots
28.10 describe the care and use of wire rope, synthetic rope, and chains
28.11 describe the correct use of plate clamps
28.12 describe the correct procedure for applying cable clips
Module 2: Introduction to GTAW Process (~2 hours Classroom Component)
29.
Students will be able to apply safe work practices and procedures when using GTAW.
Students will be expected to
29.1
describe the GTAW process and applications
29.2
explain the advantages and disadvantages of the GTAW process
29.3
explain hazards and protective measures associated with GTAW
29.4
identify the basic components of a GTAW work station
29.5
describe types of GTAW power sources
29.6
identify welding currents used in GTAW
(a) AC current
(b) DC current
(c) High frequency current
29.7
describe the torch assembly
29.8
describe gas regulators and flowmeters
2
CAREER AND TECHNICAL EDUCATION CURRICULUM
CURRICULUM OUTCOMES
Module 3: GTAW Electrodes, Filler Metals, and Shielding Gases (~4 hours Classroom Component)
30.
Students will be able to select GTAW electrodes, filler metals, and gases.
Students will be expected to
30.1
identify the function of the electrode in GTAW
30.2
identify electrodes by AWS designations and explain their applications
30.3
explain and demonstrate the care and preparation of electrodes
30.4
identify the function of the filler metals in GTAW
30.5
identify filler metals by AWS and CSA designations and explain their applications
30.6
identify types and purpose of consumable inserts
30.7
explain the care and handling of filler metals
30.8
describe the types and applications of shielding gases used in GTAW
30.9
describe the advantages and disadvantages of various types of shielding gases
Module 4: GTAW Equipment Maintenance and Troubleshooting (~3 hours Classroom Component)
31.
Students will be able to maintain and troubleshoot GTAW equipment.
Students will be expected to
31.1
diagnose power source output current problems and demonstrate corrective measures
31.2
diagnose GTAW torch and cable assembly problems and demonstrate corrective measures
31.3
explain the care and handling of GTAW equipment and components
31.4
diagnose shielding gas coverage problems and demonstrate corrective measures
Module 5: GTAW Welds on Mild Steel (~18 of 91 hours Skill Development Component)
32.
Students will be able to place stringer beads in the flat position, prepare joints for GTAW, and
perform welds in the 1F, 2F, and 3F positions.
Students will be expected to
32.1
strike an arc using the touch start or lift start and high frequency methods
32.2
demonstrate the ability to weld stringer beads in the flat position on mild steel gauge plate
32.3
prepare joints for GTAW on mild steel gauge plate
32.4
demonstrate the ability to weld fillet welds in the 1F position on mild steel gauge plate
32.5
demonstrate the ability to weld fillet welds in the 2F position on mild steel gauge plate
32.6
demonstrate the ability to weld fillet welds in the 3F position on mild steel gauge plate
CAREER AND TECHNICAL EDUCATION CURRICULUM
3
4
CAREER AND TECHNICAL EDUCATION CURRICULUM
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW)
Materials Handling
(~10 hours Classroom Component)
Introduction
Handling materials of various sizes, shapes, and weights is a common practice in the
welding trade. An apprentice must be aware of all rules and regulations governing the
handing of materials and be able to follow procedures to ensure their own safety and the
safety of those working with them.
Specific
Curriculum
Outcome
28.
Students will be able to apply safe procedures for handling materials.
SCO - Delineations Students will be expected to
28.1
28.2
28.3
28.4
28.5
28.6
28.7
28.8
28.9
28.10
28.11
28.12
identify safe procedures for handling and storing materials
determine weight and centre of gravity of loads
describe the effect that sling angles have on safe lifting
identify the load limits of commonly used wire rope slings and synthetic slings
describe the causes and effects of shock loading on rigging
identify relevant Occupational Health and Safety Regulations
identify and use hand signals for crane operations
describe safe procedures for lifting, hoisting, and moving loads
describe the purpose and use of knots
describe the care and use of wire rope, synthetic rope, and chains
describe the correct use of plate clamps
describe the correct procedure for applying cable clips
Assessment
Strategies
Paper/Pencil
Self/Peer-Assessments
Skills Performance
Teacher Observation
Career Portfolio
Resources
Alberta Module 120101j, Materials Handling
National Occupational Analysis (NOA), Human Resources and Skills Development
Canada (HRSDC): Occupational Analyses Series - Welder
StudentsAchieve (http://sas.edu.pe.ca)
CAREER AND TECHNICAL EDUCATION CURRICULUM
5
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 1
Materials Handling (~10 hours Classroom Component)
SCO 28. Students will be able to apply safe procedures for handling materials.
SCO - Delineations
Student Knowledge, Abilities, and Competencies
Students will be expected to
Topic: General Safety
• Demonstrate an uderstanding of the standard personal protective
equipment (PPE) required in the welding trade:
- head protection
- eye protection
- ear protection
- foot protection
- limb and body protection
• Demonstrate an ability to maintain a clean work environment.
• Describe proper procedures for lifting and carrying loads.
• Demonstrate an ability to follow lifting and carrying procedures.
• Demonstrate an ability to store materials and supplies in a safe
manner.
28.1
identify safe procedures for
handling and storing
materials
28.2
determine weight and centre
of gravity of loads
28.3
describe the effect that sling
angles have on safe lifting
6
Topic: Weight
• Locate lifting and rigging information.
• Calculate the weight of an object to be lifted.
• Define “centre of gravity”.
• Describe the effect of lifting an unstable load when the centre of
gravity is not located directly below the hook.
• Demonstrate an understanding of proper lifting and hoisting
procedures.
Topic: Sling Angle
• Define “sling angle”.
• Describe the rated capacity of a sling.
• Describe the effect that sling angle has on the weight distribution
across the legs.
• Demonstrate knowledge of the sling stress formula.
• Calculate the sling stress and determine the appropriate slings
required to lift loads.
CAREER AND TECHNICAL EDUCATION CURRICULUM
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 1
Materials Handling (~10 hours Classroom Component)
SCO 28. Students will be able to apply safe procedures for handling materials.
Teacher Lessons / Demonstrations
Resources
Topic: General Safety
• Review safety practices for the welding facility.
• Have on display examples of all of the PPE that welders are expected
to wear.
• Review emergency exit plans.
Texts / Teacher Resources
Alberta Module 120101j
Materials Handling
pp. 2-9
Topic: Weight
• Create visuals (overheads or slideshow) of images in the ILM to
explain centre of gravity.
Topic: Sling Angle
• Create visuals (overheads or slideshow) of images in the ILM to
explain sling angle.
Software / Databases
NOA, HRSDC: Occupational
Analyses Series - Welder
StudentsAchieve (SAS)
Numeracy
• Develop a math-enhanced lesson on calculating the weight of
structural shapes.
• Develop a math-enhanced lesson on determining the amount of
tension on a sling.
• Refer to “Fractions” module (WEL701A) for an example of a mathenhanced lesson.
Student Activities / Assessments
•
•
Determine the centre of gravity for structural shapes.
Practise safe work habits and proper housekeeping while working on
shop projects.
Literacy
• Free Writing: Use as a pre-reading strategy. Write for 3 min.
on experiences you have had related to general safety.
Numeracy
• Calculate the weight of structural shapes.
• Calculate the amount of tension on a sling.
CAREER AND TECHNICAL EDUCATION CURRICULUM
7
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 1
Materials Handling (~10 hours Classroom Component)
SCO 28. Students will be able to apply safe procedures for handling materials.
SCO - Delineations
Student Knowledge, Abilities, and Competencies
Students will be expected to
Topic: Slings
• Describe advantages of wire rope slings.
• Define “working load limit”.
• Calculate the working load limit of a wire rope.
• Describe the advantages of synthetic slings.
• Identify the configurations of synthetic web slings.
• Demonstrtate an understanding of manufacturers’ specifications
for web slings.
28.4
identify the load limits of
commonly used wire rope
slings and synthetic slings
28.5
describe the causes and
effects of shock loading on
rigging
Topic: Shock Loading
• Describe the actual working load of a wire rope.
• Define “shock loading”.
• Describe how to avoid shock loading.
identify relevant
Occupational Health and
Safety Regulations
Topic: Occupational Health and Safety
• Reference sections of the P.E.I. Occupational Health and Safety
Act that apply to rigging equipment.
• Interpret Occupational Health and Safety Regulations.
28.6
8
CAREER AND TECHNICAL EDUCATION CURRICULUM
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 1
Materials Handling (~10 hours Classroom Component)
SCO 28. Students will be able to apply safe procedures for handling materials.
Teacher Lessons / Demonstrations
Resources
Topic: Slings
• Have on display examples of a variety of wire rope and synthetic slings.
• Demonstrate how to read and interpret sling manufacturers’ tables
and charts related to working load limits of wire ropes.
Texts / Teacher Resources
Alberta Module 120101j
Materials Handling
pp. 10-14
Topic: Shock Loading
• Discuss the ways to avoid shock loading.
Software / Databases
NOA, HRSDC: Occupational
Analyses Series - Welder
Topic: Occupational Health and Safety
• Review the content in the ILM and share with students the P.E.I.
Occupational Health and Safety Regulations related to rigging.
StudentsAchieve (SAS)
Numeracy
• Develop a math-enhanced lesson related to calculating the working
load limit of wire ropes.
Student Activities / Assessments
•
•
Component ID: Identify a variety of slings and wire ropes.
Select the appropriate sling or wire rope for lifting operations.
Literacy
• Say Something (p.13 of Materials Handling ILM): Take time to
model the strategy with a student or colleague and review the rules
that will make for a successful Say Something. It is a good idea to
post these rules so everyone can see them and be reminded of them
during the activity:
- With your partner, decide who will say something first.
- When you say something, you should make a prediction, ask a
question, clarify something you had misunderstood, or make a
connection.
- If you cannot do one or more of the above things, then you
need to reread.
CAREER AND TECHNICAL EDUCATION CURRICULUM
9
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 1
Materials Handling (~10 hours Classroom Component)
SCO 28. Students will be able to apply safe procedures for handling materials.
SCO - Delineations
Students will be expected to
28.7
identify and use hand signals
for crane operations
28.8
describe safe procedures for
lifting, hoisting, and moving
loads
28.9
describe the purpose and use
of knots
10
Student Knowledge, Abilities, and Competencies
Topic: Hand Signals
• Describe the role of the signal person.
• Demonstrate an understanding of common hand signals.
Topic: Lifting, Hoisting and Moving
• Define “softeners” and describe their function.
• Describe the types of stress and abuse that are applied to slings.
• Demonstrate an ability to perform visual inspections of rope and
slings.
• Describe the function of the tag line.
• Describe factors that can cause an uneven loading on sling legs.
• Identify the following sling arrangements:
- single vertical hitch
- bridal hitch (two and three leg)
- single basket hitch
- double basket hitch
- double wrap basket hitch
- single choker hitch
- double choker hitch
- double wrap choker hitch
• Describe the function of spreader beams.
• State the importance of levelling a crane.
• Describe procedures for levelling a crane
• Describe factors that affect the lifting of any load.
• Define “load radius deflection”.
• Describe precautions to follow when hoisting and carrying a load.
Topic: Knots
• Define “knot”, “bend”, “hitch” and “splice”.
• Describe the effect that knots, bends, hitches, and splices have on
rope strength.
• Demonstrate an understanding of the purpose and function of
each of the knots, bends, hitches, and splices listed below:
- bowline, bowline on a bight, running bowline, self-centring
bowline
- figure of eight (or figure eight)
- clove hitch, round turn and two half-hitches
- timber hitch
- sheet bend, carrick bend
- cat’s-paw
• Demonstrate an ability to tie each of the knots, bends, hitches,
and splices listed above.
CAREER AND TECHNICAL EDUCATION CURRICULUM
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 1
Materials Handling (~10 hours Classroom Component)
SCO 28. Students will be able to apply safe procedures for handling materials.
Teacher Lessons / Demonstrations
Topic: Hand Signals
• Create for display in the welding facility a visual of the hand signals
for crane operation.
Topic: Lifting, Hoisting, and Moving
• Review general safety rules regarding the hoisting and lifting of
items in the welding facility.
• Demonstrate the application of softeners.
• Demonstrate the application of the various sling arrangements.
• Create a slideshow to highlight the various types of sling
arrangements.
• Create a slideshow to help describe the process of levelling a crane.
Resources
Texts / Teacher Resources
Alberta Module 120101j
Materials Handling
pp. 15-26
Software / Databases
NOA, HRSDC: Occupational
Analyses Series - Welder
StudentsAchieve (SAS)
Topic: Knots
• Create visuals from the ILM (overheads or slideshow) to identify the
difference between knots, bends, hitches, and splices.
• Demonstrate how to tie each of the knots, bends, hitches, and
splices listed in column 2.
Literacy
• Anticipation Guide: Use as a pre-reading strategy. Develop
questions around the safe application and purpose of common
knots, bends, hitches, and splices
CBL
• Arrange for students to visit an industry where numerous hoisting,
lifting and jacking operations are performed (e.g., Georgetown
Shipyard).
• Arrange for students to visit a work site that involves the use of a
crane and have them witness a real application of hand signals.
• Arrange for a local crane operator to bring a crane to the school
so students can use hand signals to direct the crane through a series
of movements.
Student Activities / Assessments
•
•
•
•
•
Role-play sets of crane operations with students as a class and in
small groups.
Practise hoisting and lifting a load using a variety of sling
arrangements and using softeners when necessary.
Label diagrams related to load radius.
Tie each of the knots, bends, hitches, and splices listed in column 2.
Use the correct knots, bends, hitches, and splices when handing
materials in the shop
Literacy
• Free Writing: Use as a pre-reading strategy. Have students write for
3 min. on a experience you had in which you had to rely on a rope
or a knot to perform a task.
CAREER AND TECHNICAL EDUCATION CURRICULUM
11
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 1
Materials Handling (~10 hours Classroom Component)
SCO 28. Students will be able to apply safe procedures for handling materials.
SCO - Delineations
Students will be expected to
28.10 describe the proper care and
use of wire rope, synthetic
rope, and chains
28.11 describe the correct use of
plate clamps
28.12 describe the correct
procedure for applying cable
clips
Student Knowledge, Abilities, and Competencies
Topic: Care of Rope and Chains
• Explain how a wire rope is constructed.
• Explain the difference between an independent wire rope core and
a fibre core.
• Define “lay”.
• Define “lay length”.
• Describe the construction of a right lay regular lay wire rope.
• Explain the difference between regular lay and lang lay rope.
• Interpret wire rope classification tables.
• Measure the size of a wire rope.
• Define seizing and describe its function.
• Describe precautions to take when installing new wire rope.
• Describe the advantages of synthetic rope over natural fibre rope.
• Demonstrate an understanding of the properties and uses of
common ropes.
• Describe factors that can reduce the breaking strength of a rope.
• State safety factors to consider when lifting objects.
• State safety factors to consider when lifting people.
• Demonstrate an understanding of the advantages and
disadvantages of lifting and hoisting using chains.
• Identify grade 8 alloy (grade T) chain.
• Describe the process of heat treating.
• Demonstrate an ability to perform visual inspections of chains.
Topic: Plate Clamps and Cable Clips
• Describe the function of plate clamps.
• Describe how to ensure the proper function of the plate clamps.
•
•
•
•
12
Describe the function of wire rope clips.
Identify the two main types of wire rope clips.
Demonstrate the abililty to correctly install both types of wire rope
clips.
Interpret manufacturers specifications on the use and installation
of wire rope clips.
CAREER AND TECHNICAL EDUCATION CURRICULUM
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 1
Materials Handling (~10 hours Classroom Component)
SCO 28. Students will be able to apply safe procedures for handling materials.
Teacher Lessons / Demonstrations
Topic: Care of Rope and Chains
• Have on hand samples of right and left lay and right and left lang
lay ropes for students to inspect.
• Demonstrate how to seize a wire rope.
• Demonstrate proper handling of wire rope.
• Demonstrate the proper method of inspecting a chain.
Topic: Plate Clamps and Cable Clips
• Demonstrate the application of plate clamps and cable clips.
• Demonstrate the proper method of inspecting plate clamps and
cable clips.
Resources
Texts / Teacher Resources
Alberta Module 120101j
Materials Handling
pp. 27-47
Software / Databases
NOA, HRSDC: Occupational
Analyses Series - Welder
StudentsAchieve (SAS)
Student Activities / Assessments
•
•
•
•
Seize wire ropes.
Set up an inspection schedule for chains, wire ropes, plate clamps
and cable clips used in the welding facility.
Replace a worn or damaged link in a chain.
Use plate clamps and cable clips when necessary while performing
hoisting and lifting operations.
CAREER AND TECHNICAL EDUCATION CURRICULUM
13
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW)
14
CAREER AND TECHNICAL EDUCATION CURRICULUM
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW)
Introduction to GTAW Process
(~2 hours Classroom Component)
Introduction
GTAW is a welding process which is used on a variety of metals where the utmost in
weld quality is desired. Prior to performing a weld, an apprentice is required to select the
specified welding process for the job. Being familiar with GTAW and the
consumables used with it will allow the apprentice to make appropriate choices.
Specific
Curriculum
Outcome
29.
Students will be able to apply safe work practices and procedures when using
GTAW.
SCO - Delineations Students will be expected to
29.1
29.2
29.3
29.4
29.5
29.6
29.7
29.8
describe the GTAW process and applications
explain the advantages and disadvantages of the GTAW process
explain hazards and protective measures associated with GTAW
identify the basic components of a GTAW work station
describe types of GTAW power sources
identify welding currents used in GTAW
(a) AC current
(b) DC current
(c) high frequency current
describe the torch assembly
describe gas regulators and flowmeters
Assessment
Strategies
Paper/Pencil
Self/Peer-Assessments
Skills Performance
Teacher Observation
Career Portfolio
Resources
Alberta Module 120202a, Introduction to GTAW Process
National Occupational Analysis (NOA), Human Resources and Skills Development
Canada (HRSDC): Occupational Analyses Series - Welder
StudentsAchieve (http://sas.edu.pe.ca)
CAREER AND TECHNICAL EDUCATION CURRICULUM
15
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 2
Introduction to GTAW Process (~2 hours Classroom Component)
SCO 29. Students will be able to apply safe work practices and procedures when using GTAW.
SCO - Delineations
Student Knowledge, Abilities, and Competencies
Students will be expected to
Topic: GTAW Process
• Describe the GTAW process.
• State applications of GTAW.
• Describe the GTAW spot welding process.
• State advantages and disadvantages of GTAW spot welding.
• Describe hot and cold wire GTAW.
• State advantages and disadvantages of hot and cold wire GTAW.
29.1
describe the GTAW process
and applications
29.2
explain the advantages and
disadvantages of the GTAW
process
29.3
16
explain hazards and
protective measures
associated with GTAW
Topic: Hazards
• Apply and describe safety measures to be taken with GTAW
in reference to:
- electrical shock
- eye, face, and hearing protection (PPE)
- fire prevention
- ventilation.
CAREER AND TECHNICAL EDUCATION CURRICULUM
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 2
Introduction to GTAW Process (~2 hours Classroom Component)
SCO 29. Students will be able to apply safe work practices and procedures when using GTAW.
Teacher Lessons / Demonstrations
Resources
Topic: GTAW Process
• Discuss the GTAW process, its application, and its advantages and
disadvantages.
Texts / Teacher Resources
Alberta Module 120102a
Introduction to GTAW Process
pp. 2-10
Topic: Hazards
• Review the general safety regulations for the welding facility.
• Demonstrate the application of the PPE required for GTAW.
• Review fire safety regulations for the welding facility.
Literacy
Anticipation Guide: Use as a pre-reading strategy. Allow students to make
assumptions about the GTAW process based on what they already know
about other welding processes.
Software / Databases
NOA, HRSDC: Occupational
Analyses Series - Welder
StudentsAchieve (SAS)
Student Activities / Assessments
•
Label diagrams of the GTAW process.
Literacy
Summarizing: Use as a post-reading
strategy. Use a graphic organizer
similar to the example to help
illustrate the advantages and
disadvantages of GTAW.
Compare and Contrast: Use as a
post-reading strategy. Compare the
process of GTAW to other welding
processes (SMAW, GMAW, FCAW,
OAW).
CAREER AND TECHNICAL EDUCATION CURRICULUM
17
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 2
Introduction to GTAW Process (~2 hours Classroom Component)
SCO 29. Students will be able to apply safe work practices and procedures when using GTAW.
SCO - Delineations
Students will be expected to
29.4
identify the basic
components of a GTAW
work station
29.5
describe types of GTAW
power sources
29.6
identify welding currents
used in GTAW:
(a) AC Current
(b) DC Current
(c) High Frequency Current
18
Student Knowledge, Abilities, and Competencies
Topic: GTAW Outfit and Power Sources
• Identify the components of a GTAW work station.
• Describe optional accessories that may be part of the GTAW
work station.
• Describe the process of pulsed GTAW and discuss its advantages.
•
•
•
•
•
Describe factors that affect the type of power source required.
Describe the types of power sources available.
Define “drooping”.
State the classifications of power sources.
Describe the features and controls built into a full function
GTAW power source.
Topic: Welding Currents
• Define “amperage” and “voltage”.
• State the welding currents used for GTAW.
• Describe the resulting welding characteristics unique to each
current type and polarity.
• Describe the function and process of each of the following welding
currents:
- direct current electrode negative (DCEN)
- direct current electrode positive (DCEP)
- alternating current
• Define “arc rectification”.
• Define “DC component”.
• List features that help with arc starting and arc stability.
• Describe the principles of operation and discuss the advantages
and disadvantages of the following:
- high-frequency current
- high voltage injection
- AC square wave output
- AC unbalanced and balanced wave control
• Identify proper welding current for a variety of metals.
CAREER AND TECHNICAL EDUCATION CURRICULUM
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 2
Introduction to GTAW Process (~2 hours Classroom Component)
SCO 29. Students will be able to apply safe work practices and procedures when using GTAW.
Teacher Lessons / Demonstrations
Topic: GTAW Outfit and Power Sources
• Display all the components of a GTAW outfit.
• Demonstrate how to set the power source to perform GTAW welds.
Topic: Welding Currents
• Create a slideshow of the graphics from the ILM to help illustrate
the effects of welding current.
Literacy
Materials related to outcome 29.6 (pp. 20-27) in this module may be
difficult for students to read. Help students understand how to read the
text by modelling reading strategies.
•
Resources
Texts / Teacher Resources
Alberta Module 120102a
Introduction to GTAW Process
pp. 11-27
Software / Databases
NOA, HRSDC: Occupational
Analyses Series - Welder
StudentsAchieve (SAS)
Think Aloud and Say Something: Use as during-reading strategies.
Take time when doing the Think Aloud to reflect on how it is you
yourself make meaning when reading challenging trade-related text,
and how you relate the topic to prior topics covered (e.g., SMAW
and GMAW equipment). Take time to model the Say Something
strategy with a student or colleague and review the rules that will
make for a successful activity. It is a good idea to post these rules so
everyone can see them and be reminded of them during the activity:
- With your partner, decide who will say something first.
- When you say something, you should make a prediction, ask a
question, clarify something you had misunderstood, or make a
connection.
- If you cannot do one or more of the above things, then you need
to reread.
CAREER AND TECHNICAL EDUCATION CURRICULUM
19
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 2
Introduction to GTAW Process (~2 hours Classroom Component)
SCO 29. Students will be able to apply safe work practices and procedures when using GTAW.
SCO - Delineations
Student Knowledge, Abilities, and Competencies
Students will be expected to
Topic: Torches
• Describe the characteristics of both air-cooled and water-cooled
torches.
• Describe how GTAW torches are rated.
• Identify the components of both an air-cooled and water-cooled
torch.
• Describe the function of each of the following components:
- torch cap
- torch body
- collet body and electrode collet
- gas nozzles
- gas lenses
• Assemble a GTAW torch with the correct equipment to perform a
weld.
29.7
describe the torch assembly
29.8
describe gas regulators and
flowmeters
20
Topic: Regulators and Flowmeters
• Describe the function of a regulator.
• Describe the function of a flowmeter.
• Discuss points to consider when selecting a regulator and/or
flowmeter.
• Describe the function and characteristics of shielding gas hoses.
• Describe the function of the solenid valves.
• Read and interpret WHMIS MSDS on compressed gas cylinders.
• Demonstrate an ability to assemble the gas cylinder valve and
regulators.
• Demonstrate an ability to adjust gas flow rate to required working
rate.
CAREER AND TECHNICAL EDUCATION CURRICULUM
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 2
Introduction to GTAW Process (~2 hours Classroom Component)
SCO 29. Students will be able to apply safe work practices and procedures when using GTAW.
Teacher Lessons / Demonstrations
Resources
Topic: Torches
• Make an overhead of figure 32.
• Demonstrate how to disassemble a torch body.
Texts / Teacher Resources
Alberta Module 120102a
Introduction to GTAW Process
pp. 28-44
Topic: Regulators and Flowmeters
• Review the set-up and operation of regulators and flowmeters.
• Create visuals from the ILM.
Student Activities / Assessments
•
•
Assemble a GTAW air-cooled torch body.
Label diagrams of GTAW torches.
Literacy
• Free Writing: Use as a pre-reading strategy. Write for 3 min. on
experiences you have had working with torches, regulators, and
flowmeters.
CAREER AND TECHNICAL EDUCATION CURRICULUM
Software / Databases
NOA, HRSDC: Occupational
Analyses Series - Welder
StudentsAchieve (SAS)
Alberta ILM Graphics CD
Welding Period 2
21
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW)
22
CAREER AND TECHNICAL EDUCATION CURRICULUM
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW)
GTAW Electrodes, Filler Metals, and
Shielding Gases (~4 hours Classroom Component)
Introduction
A welder apprentice must develop a solid working knowledge of the electrodes, filler
metals, and shielding gases used in all welding processes. This knowledge enables the apprentice to ensure that projects and welds conform to acceptable standards, and will help
them to troubleshoot problems related to the welding process.
Specific
Curriculum
Outcome
30.
Students will be able to select GTAW electrodes, filler metals, and gases.
SCO - Delineations Students will be expected to
30.1
30.2
30.3
30.4
30.5
30.6
30.7
30.8
30.9
identify the function of the electrode in GTAW
identify electrodes by AWS designations and explain their applications
explain and demonstrate the care and preparation of electrodes
identify the function of the filler metals in GTAW
identify filler metals by AWS and CSA designations and explain their applications
identify types and purpose of consumable inserts
explain the care and handling of filler metals
describe the types and applications of shielding gases used in GTAW
describe the advantages and disadvantages of various types of shielding gases
Assessment
Strategies
Paper/Pencil
Self/Peer-Assessments
Skills Performance
Teacher Observation
Career Portfolio
Resources
Alberta Module 120202b, GTAW Electrodes, Filler Metals and Shielding Gases
National Occupational Analysis (NOA), Human Resources and Skills Development
Canada (HRSDC): Occupational Analyses Series - Welder
StudentsAchieve (http://sas.edu.pe.ca)
CAREER AND TECHNICAL EDUCATION CURRICULUM
23
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 3
GTAW Electrodes, Filler Metals, and Shielding Gases (~4 hours Classroom Component)
SCO 30. Students will be able to select GTAW electrodes, filler metals, and gases.
SCO - Delineations
Student Knowledge, Abilities, and Competencies
Students will be expected to
30.1
identify the function of the
electrode in GTAW
Topic: GTAW Electrodes
• Describe the function of the electrode used for GTAW.
• State the characteristics of tungsten that make it an effective
electrode.
• State the four alloying elements used to create tungsten alloys.
30.2
identify electrodes by AWS
designations and explain their
applications
•
•
•
•
•
30.3
24
explain and demonstrate the
care and preparation of
electrodes
Interpret AWS specifications for identifying GTAW electrodes.
State factors to consider when selecting a tungsten electrode.
Describe the function and intended use of common GTAW
electrodes.
Identify the finish on the electrode.
Interpret data related to electrode selection from manufacturers’
tables and specifications.
Topic: Care and Preparation
• Describe the purpose of preparing electrodes.
• State the application of tapered ends.
• State the application of balled ends.
• Describe the three methods of preparing electrodes.
• Explain why grinding marks should be longitudinal.
• Discuss how to keep an electrode in good condition when welding.
• Practise safe work habits when handling and preparing electrodes.
• Describe factors that influence electrode end conditions.
• Predict potential problems based on the condition of the electrode.
CAREER AND TECHNICAL EDUCATION CURRICULUM
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 3
GTAW Electrodes, Filler Metals, and Shielding Gases (~4 hours Classroom Component)
SCO 30. Students will be able to select GTAW electrodes, filler metals, and gases.
Teacher Lessons / Demonstrations
Topic: GTAW Electrodes
• Have a variety of common GTAW electrodes for display and for
circulation through the class.
• Review the AWS standards for the classification of GTAW electrodes.
Topic: Care and Preparation
• Create a slideshow using images from the graphics CD to help
illustrate the various types of electrode preparation.
• Demonstrate how to properly prepare an electrode.
• Demonstrate how to inspect and recondition an electrode.
Resources
Texts / Teacher Resources
Alberta Module 120102b
GTAW Electrodes, Filler Metals, and
Shielding Gases
pp. 2-13
Software / Databases
NOA, HRSDC: Occupational
Analyses Series - Welder
Student Activities / Assessments
StudentsAchieve (SAS)
•
•
•
Alberta ILM Graphics CD
Welding Period 2
Prepare GTAW electrodes for shop projects.
Recondition GTAW electrodes.
Select the appropriate GTAW electrode for shop projects.
Literacy
• Free Writing: Use as a pre-reading strategy. Write for 3 min. on
experiences you have had identifying and working with
welding electrodes.
CAREER AND TECHNICAL EDUCATION CURRICULUM
25
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 3
GTAW Electrodes, Filler Metals, and Shielding Gases (~4 hours Classroom Component)
SCO 30. Students will be able to select GTAW electrodes, filler metals, and gases.
SCO - Delineations
Student Knowledge, Abilities, and Competencies
Students will be expected to
Topic: Filler Metals
• Identify various forms of filler metals.
• Describe factors to consider when selecting a filler metal.
30.4
identify the function of the
filler metals in GTAW
30.5
identify filler metals by AWS
and CSA designations and
explain their applications
•
•
•
Describe AWS and CSA designations.
Interpret specification tables related to filler metals for GTAW.
Explain the characteristics of commonly used filler metals.
30.6
identify types and purpose of
consumable inserts
•
•
Describe advantages of using consumable inserts.
Identify various forms of consumable inserts and state their
intended function.
30.7
explain the care and handling
of filler metals
•
Practise proper care and handling of filler metals.
26
CAREER AND TECHNICAL EDUCATION CURRICULUM
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 3
GTAW Electrodes, Filler Metals, and Shielding Gases (~4 hours Classroom Component)
SCO 30. Students will be able to select GTAW electrodes, filler metals, and gases.
Teacher Lessons / Demonstrations
Topic: Filler Metals and Consumable Inserts
• Have a variety of common GTAW filler metals for display and for
circulation through the class.
• Review the AWS standards for the classification of GTAW filler metals.
• Demonstrate the application of a consumable insert and joint
preparation.
• Discuss the care and handling of GTAW filler metals.
Student Activities / Assessments
•
•
•
Component ID: Identity a variety of filler metals and electrodes used
with GTAW.
Prepare joints for consumable inserts.
Demonstrate proper care and handling of GTAW filler metals and
electrodes.
CAREER AND TECHNICAL EDUCATION CURRICULUM
Resources
Texts / Teacher Resources
Alberta Module 120102b
GTAW Electrodes, Filler Metals, and
Shielding Gases
pp. 14-22
Software / Databases
NOA, HRSDC: Occupational
Analyses Series - Welder
StudentsAchieve (SAS)
27
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 3
GTAW Electrodes, Filler Metals, and Shielding Gases (~4 hours Classroom Component)
SCO 30. Students will be able to select GTAW electrodes, filler metals, and gases.
SCO - Delineations
Student Knowledge, Abilities, and Competencies
Students will be expected to
Topic: Shielding Gases
• Define terms related to shielding gases.
• Interpret WHMIS information.
• Explain the function of the shielding gas.
• State the general application of each of the following shielding
gases used for GTAW:
- argon
- helium
- nitrogen
- argon helium
- argon hydrogen
• Demonstrate an ability to regulate shielding gas flow rates.
30.8
describe the types and
applications of shielding
gases used in GTAW
30.9
describe the advantages and
disadvantages of various
types of shielding gases
28
Topic: Advantages and Disadvantages
• Demonstrate an understanding of the advantages of various
shielding gases.
• Demonstrate an understanding of the disadvantages of various
shielding gases.
CAREER AND TECHNICAL EDUCATION CURRICULUM
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 3
GTAW Electrodes, Filler Metals, and Shielding Gases (~4 hours Classroom Component)
SCO 30. Students will be able to select GTAW electrodes, filler metals, and gases.
Teacher Lessons / Demonstrations
Resources
Topic: Shielding Gases
• Review the terms related to shielding gases.
• Review the function and characteristics of shielding gases, and relate
the content back to experiences the students would have had
working with shielding gases in GMAW welding.
Topic: Advantages and Disadvantages
• Discuss table 4 and table 5 in the ILM (pp. 27-28).
Software / Databases
NOA, HRSDC: Occupational
Analyses Series - Welder
Student Activities / Assessments
•
•
Identify shielding gas problems from sample welds.
Copy and complete a chart similar to the example below.
Gas
Characteristics / Applications Cost
Texts / Teacher Resources
Alberta Module 120102b
GTAW Electrodes, Filler Metals, and
Shielding Gases
pp. 23-28
StudentsAchieve (SAS)
Metals
Literacy
Summarizing: Use as a post-reading strategy. Use a graphic organizer
similar to the example shown to help illustrate the advantages and
disadvantages of GTAW.
CAREER AND TECHNICAL EDUCATION CURRICULUM
29
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW)
30
CAREER AND TECHNICAL EDUCATION CURRICULUM
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW)
GTAW Equipment Maintenance and
Troubleshooting (~3 hours Classroom Component)
Introduction
Keeping welding equipment running smoothly not only results in better quality welds,
but also improves efficiency, which helps reduce the high cost of equipment down time.
The more knowledgeable apprentices are about the function, operation, and maintenance
of GTAW equipment, the better prepared they are to set welding parameters, diagnose
problems, and take preventative steps to avoid future problems.
Specific
Curriculum
Outcome
31.
Students will be able to maintain and troubleshoot GTAW equipment.
SCO - Delineations Students will be expected to
31.1
31.2
31.3
31.4
diagnose power source output current problems and demonstrate corrective measures
diagnose GTAW torch and cable assembly problems and demonstrate corrective
measures
explain the care and handling of GTAW equipment and components
diagnose shielding gas coverage problems and demonstrate corrective measures
Assessment
Strategies
Paper/Pencil
Self/Peer-Assessments
Skills Performance
Teacher Observation
Career Portfolio
Resources
Alberta Module 120102c, GTAW Equipment Maintenance & Troubleshooting
National Occupational Analysis (NOA), Human Resources and Skills Development
Canada (HRSDC): Occupational Analyses Series - Welder
StudentsAchieve (http://sas.edu.pe.ca)
CAREER AND TECHNICAL EDUCATION CURRICULUM
31
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 4
GTAW Equipment Maintenance and Troubleshooting (~3 hours Classroom Component)
SCO 31. Students will be able to maintain and troubleshoot GTAW equipment.
SCO - Delineations
Student Knowledge, Abilities, and Competencies
Students will be expected to
Topic: Power Sources
• Describe factors to consider when setting up and maintaining
GTAW power sources:
- location and hookup of the welding power source
- torch assembly
- shielding gas and gas control system
- work lead
- high-frequency current system
- shut-down procedures
• Interpret manufacturers’ information related to GTAW equipment
maintenance.
31.1
diagnose power source
output current problems and
demonstate corrective
measures
31.2
diagnose GTAW torch and
cable assembly problems and
demonstrate corrective
measures
32
Topic: Torch and Cable Assemblies
• Describe factors to consider when setting up and maintaining
GTAW torch and cable assemblies:
- torch handle and head
- air-cooled GTAW torches
- gas control valves
- cable covers
- nozzles
- collet and collet body
- gas lens
- electrode condition
• Interpret manufacturers’ information related to GTAW torches
and
cable assemblies.
CAREER AND TECHNICAL EDUCATION CURRICULUM
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 4
GTAW Equipment Maintenance and Troubleshooting (~3 hours Classroom Component)
SCO 31. Students will be able to maintain and troubleshoot GTAW equipment.
Teacher Lessons / Demonstrations
Topic: Power Sources
• Demonstrate the proper assembly and adjustment of a GTAW set-up.
Topic: Torch and Cable Assemblies
• Demonstrate proper care, handling, and inspection of GTAW torch
and cable assemblies.
CBL
• Guest Speaker: Invite a service person and salesperson from a local
machine supplier to speak to the class about equipment
maintenance.
Resources
Texts / Teacher Resources
Alberta Module 120102c
GTAW Equipment Maintenance and
Troubleshooting
pp. 2-18
Software / Databases
NOA, HRSDC: Occupational
Analyses Series - Welder
StudentsAchieve (SAS)
Student Activities / Assessments
•
•
•
Identify the components of the GTAW set-up.
Correctly set up and adjust a GTAW set-up.
Develop a routine maintenance schedule.
Literacy
• Free Writing: Use as a pre-reading strategy. Write for 3 min. on the
value of and experiences you have had with equipment maintenance
and troubleshooting.
CAREER AND TECHNICAL EDUCATION CURRICULUM
33
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 4
GTAW Equipment Maintenance and Troubleshooting (~3 hours Classroom Component)
SCO 31. Students will be able to maintain and troubleshoot GTAW equipment.
SCO - Delineations
Student Knowledge, Abilities, and Competencies
Students will be expected to
Topic: Care and Handling
• Demonstrate an understanding of the proper care and handling of
the following components of the GTAW outfit:
- regulator/flowmeter unit
- hoses
- remote control switches
- cooling systems
31.3
explain the care and handling
of GTAW equipment and
components
31.4
diagnose shielding gas
coverage problems and
demonstrate corrective
measures
34
Topic: Shielding Gases
• Describe the following common problems related to shielding gases:
- inadequate gas flow
- excessive gas flow
- incorrect gas selection
• Describe the three categories of weld faults.
- process
- electrical
- mechanical
• Demonstrate an ability to diagnose GTAW weld faults related to
the categories above.
CAREER AND TECHNICAL EDUCATION CURRICULUM
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 4
GTAW Equipment Maintenance and Troubleshooting (~3 hours Classroom Component)
SCO 31. Students will be able to maintain and troubleshoot GTAW equipment.
Teacher Lessons / Demonstrations
Resources
Topic: Care and Handling
• Review the proper handling procedures and safety regulations related
to a GTAW outfit.
Texts / Teacher Resources
Alberta Module 120102c
GTAW Equipment Maintenance and
Troubleshooting
pp. 19-26
Topic: Shielding Gases
• Review the tables on pp. 24-26 of the ILM.
Literacy
• Anticipation Guide: Use as a pre-reading strategy. The questions or
statements made should relate to trouble shooting welding
equipment with regard to process, electrical and mechanical problems.
Software / Databases
NOA, HRSDC: Occupational
Analyses Series - Welder
StudentsAchieve (SAS)
Student Activities / Assessments
•
•
Identify various weld faults related to mechanical, process, and
electrical problems.
Implement a routine maintenance schedule.
CAREER AND TECHNICAL EDUCATION CURRICULUM
35
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW)
36
CAREER AND TECHNICAL EDUCATION CURRICULUM
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW)
GTAW Welds on Mild Steel
(~18 of 91 hours Skill Development Component)
Introduction
A welder apprentice must be able to perform GTAW welds to an acceptable standard.
This module is a hands-on, practical module that will develop students’ ability to
perform GTAW welds on mild steel plate.
Specific
Curriculum
Outcome
32.
Students will be able to place stringer beads in the flat position, prepare joints
for GTAW, and perform welds in the 1F, 2F, and 3F positions.
SCO - Delineations Students will be expected to
32.1
32.2
32.3
32.4
32.5
32.6
strike an arc using the touch start or lift start and high-frequency methods
demonstrate the ability to weld stringer beads in the flat position on mild steel gauge
plate
prepare joints for GTAW on mild steel gauge plate
demonstrate the ability to weld fillet welds in the 1F position on mild steel gauge plate
demonstrate the ability to weld fillet welds in the 2F position on mild steel gauge plate
demonstrate the ability to weld fillet welds in the 3F position on mild steel gauge plate
Assessment
Strategies
Paper/Pencil
Self/Peer-Assessments
Skills Performance
Teacher Observation
Career Portfolio
Resources
Alberta Module 120102d, GTAW Welds on Mild Steel
National Occupational Analysis (NOA), Human Resources and Skills Development
Canada (HRSDC): Occupational Analyses Series - Welder
StudentsAchieve (http://sas.edu.pe.ca)
CAREER AND TECHNICAL EDUCATION CURRICULUM
37
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 5
GTAW Welds on Mild Steel (~18 of 91 hours Skill Development Component)
SCO 32. Students will be able to place stringer beads in the flat position, prepare joints for GTAW, and perform
welds in the 1F, 2F, and 3F positions.
SCO - Delineations
Student Knowledge, Abilities, and Competencies
Students will be expected to
Topic: Starting the Arc
• Demonstrate an understanding of the factors to consider when
assessing the value of any welding technique.
• Describe and practise safety procedures related to GTAW processes.
• Define the terms identified on pp. 3-4 of ILM 120202d.
• Interpret welding procedure specifications.
• Create welding procedure specifications.
• Perform welding techniques used for GTAW.
• Demonstrate the ability to start the arc by means of
- scratch start
- high frequency start
- lift start.
32.1
38
strike an arc using the touch
start or lift start and high
frequency methods
CAREER AND TECHNICAL EDUCATION CURRICULUM
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 5
GTAW Welds on Mild Steel (~18 of 91 hours Skill Development Component)
SCO 32. Students will be able to place stringer beads in the flat position, prepare joints for GTAW, and perform
welds in the 1F, 2F, and 3F positions.
Teacher Lessons / Demonstrations
Topic: Starting the Arc
• Create a slideshow to illustrate the proper method of starting the arc.
• Demonstrate proper starting techniques.
Student Activities / Assessments
•
•
Create a Welding Procedure Specification (WPS) for eacj shop project.
Have the students fold a piece of blank paper in half. Label the top
half “scratch start” the bottom half “high-frequency start,” and the
back “lift start”. Have students practice both methods of striking
an arc by using a pencil or a felt tip marker. The marks left on
the paper will help determine students’ understanding of both
methods. Observe each student for proper technique and arc length.
Resources
Texts / Teacher Resources
Alberta Module 120102d
GTAW Welds on Mild Steel
pp. 2-10
Software / Databases
NOA, HRSDC: Occupational
Analyses Series - Welder
StudentsAchieve (SAS)
Literacy
• Summarizing: Use as a post-reading strategy after you have read the
exercise.
CAREER AND TECHNICAL EDUCATION CURRICULUM
39
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 5
GTAW Welds on Mild Steel (~18 of 91 hours Skill Development Component)
SCO 32. Students will be able to place stringer beads in the flat position, prepare joints for GTAW, and perform
welds in the 1F, 2F, and 3F positions.
SCO - Delineations
Student Knowledge, Abilities, and Competencies
Students will be expected to
•
32.2
demonstrate the ability to
weld stringer beads in the flat
position on mild steel gauge
plate
32.3
prepare joints for GTAW on
mild steel gauge plate
32.4
demonstrate the ability to
weld fillet welds in the 1F
position on mild steel gauge
plate
32.5
demonstrate the ability to
weld fillet welds in the 2F
position on mild steel gauge
plate
32.6
demonstrate the ability to
weld fillet welds in the 3F
position on mild steel gauge
plate
40
For each of the exercises in the ILM that relate to outcomes
32.2–32.6 demonstrate the ability to
- select/prepare and identify correct materials
- prepare work area
- interpret welding parameters
- evaluate the quality of the final weld.
CAREER AND TECHNICAL EDUCATION CURRICULUM
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW) - MODULE 5
GTAW Welds on Mild Steel (~18 of 91 hours Skill Development Component)
SCO 32. Students will be able to place stringer beads in the flat position, prepare joints for GTAW, and perform
welds in the 1F, 2F, and 3F positions.
Teacher Lessons / Demonstrations
•
•
•
Review and demonstrate proper safety procedures.
Demonstrate set-up of GTAW welding parameters.
Perform a class demonstration for each of the exercises.
Student Activities / Assessments
Complete each of the exercises in the ILM.
Literacy
• Summarizing: Use as a post-reading strategy after you have read the
exercise.
Resources
Texts / Teacher Resources
Alberta Module 120102d
GTAW Welds on Mild Steel
pp. 11-29
Software / Databases
NOA, HRSDC: Occupational
Analyses Series - Welder
StudentsAchieve (SAS)
Enrichment / Research Activities
•
Participate in Skills Canada competitions.
CAREER AND TECHNICAL EDUCATION CURRICULUM
41
WEL801E - GAS TUNGSTEN ARC WELDING (GTAW)
42
CAREER AND TECHNICAL EDUCATION CURRICULUM