Republic of the Philippines
DAVAO DEL NORTE STATE COLLEGE
INSTITUTE OF TEACHER EDUCATION
New Visayas, Panabo City, Davao del Norte, Philippines 8105
SEMI- DETAILED LESSON PLAN IN
TLE 221- INTRODUCTION TO INDUSTRIAL ARTS 2
Date: April 29, 2022
Year and Section: BTLED 2-B
Subject: TLE 221- INTRODUCTION TO INDUSTRIAL ARTS 2
I. LEARNING OBJECTIVES:
At the end of the lesson 100% of students shall be able to;
1. Identify the different methods of cutting and joining metals.
2. Discuss the importance of the different methods of cutting and joining metals.
3. Create an infographic showing the significance of cutting and joining metals in metal
works.
II. LEARNING CONTENT
a. Subject Matter: Methods of Cutting and Joining Metals.
b. References: Module 2 lesson 5 Methods of Cutting and Joining Metals
c. Materials: Laptop, Mobile phone, Online educational application, Online software
and PowerPoint presentation (lesson content, videos and images)
d. Skills: Management, Reading, Analyzing, Observing and Speaking.
III. LEARNING EXPERIENCES/PROCEDURES:
A. Preliminaries:
1. Prayer
2. Greeting
3. Attendance
4. Energizer: Paint me a picture!
Instructions: The teacher will show a series of pictures and the students will try to
imitate it as much as they can. As a proof of their participation the students will take
their own picture and share it to the class group chat. For props, the students can use
different resources available.
5. Recap
6. Motivation: Guess me!
1. Which word in the dictionary is spelled incorrectly?
Ans: Incorrectly
2. What do Alexander The Great and Winnie The Pooh have in common?
Ans:Middle name
3. What word becomes shorter when you add two letters to it?
Ans: Short
4. David’s parents have three sons: Snap, Crackle, and what’s the name of the third son?
Ans: David
5. I’m tall when I’m young, and I’m short when I’m old. What am I?
Ans: Candle
B. ACTIVITY (Lesson Proper): Q and A Portion
Mechanics: The teacher will provide questions and the students will answer through
the google meet in call messages. The first student who can answer the question correctly
he/she must deliver the answer like a beauty queen. The answer must start with I believe…
1. A burning technique that involves application of high heat to the surface metal, which
brings it up to a temperature at which it will soften and then break along a precise
line.
Ans: Welding
2. Joining metals using metallic materials called rivets.
Ans: Riveting
3. It requires a drill bit applied directly to metal, then the typical combination of force
and rotation that you’d see when a screw was being drilled into a wall.
Ans: Drilling
4. Joining two folded edges of sheet metal that are hooked and locked together.
Ans: Grooving
5. What is the common way of cutting metals in ordinary work?
Ans: Sawing
C. ANALYSIS
Observe and analyze the picture below:
Questions:
1.What are these tools?
Ans: Soldering and Sawing
2. Who among you here encountered or tried to use these type of tools?
Ans: Random students will give their ideas.
D. ABSTRACTION
Lesson 5 Methods of Cutting and Joining Metals
Within steel and the rest of the metal working world, cutting and separating metals is
a vital process. There are numerous metal cutting methods out there, starting with basic
hand-held items like hacksaws, chisels or shears.
Methods of Cutting metals:
1. Shearing - to cut through with a hard blade.
2. Acetylene - cutting by flame, partially melting portion metal to be cut.
3. Electric welding - cutting by melting a portion of metal by electric arc. The welding
machine is adjusted to high current.
4. Machining - using a lathe machine by cutting metals while turning.
5. Sawing - it is the common way of cutting metals in ordinary work. Hacksaw is used for
sawing metals.
6. Filing - is the process of cutting a small or thin portion of the metal.
7. Grinding - (using a thin grinding stone) the machine is especially designed to cut even hard
metals is called an abrasive cut-off machine. Grinding involves a smooth metal surface and
very high-quality metal. A grinding machine has an abrasive wheel that turns while making
contact with the metal, wearing the surface down and helping separate it.
8. Turning- Turning involves applying the sharp point of a cutting tool to a metal surface as
it’s rapidly spun. This removes the top layer of metal to a predetermined size.
9. Drilling- requires a drill bit applied directly to metal, then the typical combination of
force and rotation that you’d see when a screw was being drilled into a wall. Drilling allows
for very precise holes in metal where needed.
10. Flame- A gas flame that reaches a temperature of above 3,500 degrees Celsius can also
be used. This heats the metal to melting point, then directs a stream of oxygen onto the spot,
causing the metal to burn and melt along a line.
11. Laser- cutting is relatively similar – using a concentrated beam of light that can be reduced
to a single point at a very high temperature. This allows exact, precise shapes to be cut out of
metal, and lasers are often controlled by a computer to get maximum accuracy here.
12. Plasma- A more recent technique is plasma cutting, which uses a plasma torch to pump
either oxygen or inert gas out of the nozzle while simultaneously sending an electrical arc
through the gas. This creates plasma hot enough to melt metal while moving quickly enough
to blow metal molten away.
13. Water jets, or erosion technology- mimic the effect of water on metal in the natural
environment – just at a much higher rate. This method doesn’t rely on any heat, and can
therefore be used on metals that are sensitive to high heat.
Methods of joining metals:
1. Welding - melts two pieces of metal solidly together at their point of contact, and
sometimes the point of contact is stronger than the metal itself. Welding or burning
techniques involve application of high heat to the surface metal, which brings it up to a
temperature at which it will soften and then break along a precise line.
2. Soldering - a method of joining two metal parts using a third metal (alloy) that has a
lower melting point called solder.
3. Riveting - joining metals using metallic materials called rivets.
4. Grooving - joining two folded edges of sheet metal that are hooked and locked together.
5. Fastening with bolt and nut - this is similar to rivets bolt or bolt and nut.
6. Fastening with metal screw- preferred for thin sheets of metal just like riveting.
FASTENING SHEET METALS
1.
2.
●
●
3.
4.
Riveting - They are used to join two or more sheets of metal permanently. They are
generally made of aluminum, copper or iron. Round head and flat head rivets are
commonly used. Blind rivets are made so all the riveting is done from one side of the
metal.
Soft soldering - Soldering is the process of fastening two or more pieces of metal
together by means of an alloy (solder) having lower melting point than that of the
pieces being joined.
Soft solder is made of varying percentages of tin and lead. The most common
composition is 40/60, 50/50, and 60/40 (first number refers to the tin part).
Soldering copper must always be tinned before they do a good job of soldering. After
a soldering copper has been overheated, the point becomes covered with oxide. This
oxide prevents the heat from flowing to the metal.
Sheet metal screws- These are used in sheet metal work to join and install ductwork
for heating, ventilation, and air-conditioning. Many of our appliances are covered
with sheet metal cases that are joined with sheet metal screws. They are commonly
called "self-tapping screws".
Brazing- is quite similar to soldering. An oxy-acetylene welding torch is used to heat
the metal until the brazing rod flows at the area being joined. The base metals are
not melted.
Joints that are properly brazed are very strong. A brazing rod, usually a copper alloy
and matching flux are used.
Adjust the torch to a neutral flame and apply heat to the metals being joined until
they are red hot. Heat the end of the brazing rod and dip in the flux, causing it to
cling to the rod.
E. APPLICATION:
The teacher will shows a pictures, and the students will identify what kind of cutting
and joining methods it is.
1.
= SAWING METHOD
2.
= DRILLING METHOD
3.
= SOLDERING METHOD
4.
= RIVETING METHOD
5.
= GRINDING METHOD
IV. ASSESSMENT
Identification. Write T if the statement is true and change the underlined words if its
false to make it true.
Electric Welding 1. Cutting by melting portion of metal by shearing arc.
Lathe Machine 2. Using sawing tool by cutting metals while turning.
TRUE
3. Brazing is a quite similar to soldering, it is used to heat the metal until
brazing rod lows.
Fastening with metal screw 4. Fastening wit bolt and nut preferred for thin sheets metal
just like riveting.
TRUE
together
5. Soft soldering is the process of fastening two or more pieces of metal
V. ASSIGNMENT:
Create an infographic showing the significance of cutting and joining metals in metal works.
Infographic Criteria:
Content……………….40%
Originality……………30%
Creativity……………...30%
Prepared by:
Sabanto Reneth A.
Cristine Mae A. Nayon
TLE 221 Students
Observed by:
RANIEL P. NATIVIDAD
TLE 221 Instructor