General-4
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Which NDT method is associated with Burmah Castrol strips?
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Radiography testing
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Helium leak testing
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Magnetic particle testing
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Ultrasonic testing
In a single pass weld, the width of the zone in which longitudinal residual stresses are
tensile, is: Page 19-2
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Independent of the weld width
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Narrower than the weld metal
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The same width as the weld metal
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Wider than the weld metal and heat affected zone
Standard oxy-fuel gas cutting equipment can be applied to:
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Aluminum alloys
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Copper
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Carbon Steels
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Austenitic stainless steel
In TIG welding hydrogen is added to argon for the welding of which type of steel?
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Carbon steel
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Copper
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Carbon manganese steel
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Austenitic stainless steel
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What may be a reason for using nitrogen gas in TIG welding?
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To stabilize the arc when welding carbon steel
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It can be used to weld copper
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The gas used is always the choice of the welder
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It is the very best gas to nickel alloys
If the maximum inter pass temperature is exceeded in a carbon manganese butt
weld, what would be affected most.
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Hardness
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Toughness
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Fusion
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Penetration
What is meant by the term duty cycle?
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How long a welder can weld for in a given period
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The amount of time the electrode is being used
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The amount of time a welding machine can be used
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The amount of electricity being consumed
Which of the following standards is concerned with welder approval?
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BS EN ISO 2560
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BS EN 15614
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BS EN 287
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BS EN ISO 22553
A drawing with symbols to BS EN 22553 will show a 5mm leg fillet by which of the
following:
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b. t5
c. z5
d. 5z
Which of the following types of destructive test is sometimes used for welder
qualification testing?
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a5
Hardness test
CTOD
b. Fracture test
c. Charpy V notch impact test
d.
What does the term ‘back-step’ refer to during welding?
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A QA term referring to inspection points
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Use of step wedges on the root of the joint
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Use of step wedges for radiography
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A weld run sequence
A typical temperature for stress relieving carbon-manganese steel weld-ments is:
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580-620’c
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5000-6200’c
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75-80’c
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1500-1800’c
Which of the following materials is most susceptible to hydrogen cracking?
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Low carbon steel
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Austenitic stainless steel
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High strength low alloy steel
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Aluminum
Ultraviolet and infrared radiation, produced during arc welding, may:
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Make arc striking easier
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Be used for weld testing
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Increase the welding speed
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Cause skin burns
The penetrating power of an X-ray set is expressed in:
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b. KV
c. IQI values
d. The number of Isotope type
If pre heating is decreased, which of the following would be most affected?
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Curies
Impact value
b. Hardness
c. Tensile strength
d. Toughness
Preheating may not be necessary during welding in which of the following cases?
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Welding of cast iron
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Welding of low alloy streets
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Welding of manganese stainless steel
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Welding of Austenitic stainless steel
Which of the following is normally true?
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Impact energy a specified in N/mm²
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Heat input is specified in K.I/mm²
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Yield strength in specified in N/mm²
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Diffusible hydrogen is specified in ml.
Which standard is used for European welding procedure qualification?
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ASME IX
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BS EN ISO 4872
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BS EN ISO 15614
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BS EN ISO 287
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The term manual welding is often used when the welder controls:
• Arc length
c. Burn off rate
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b. Wire speed
d. Transfer mode
A fatigue fracture can be identified (from examination of the fracture faces) by:
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The presence of beach marks
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The presence of plastic deformation
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Being rough and torn
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Being flat and rough
An efficient weld metal volume reduction can be achieved by: Page No. 19-13
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Changing from double V to single V
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Changing from single V to single U
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Changing from double U to double V
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Changing from single J to single V
Which welding process develops the lowest level of hydrogen?
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TIG
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SAW
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MMA
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MIG / MAG
Which of the following defects will have the more severe effect on the load bearing
condition?
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Undercut
c. Incompletely filled groove
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Irregular width
d. Excess penetration
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Which of the following actions/ can help to prevention of spatter during arc
welding?
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Switch to AC power
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Use dry electrodes
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Reduces arc current
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All of the above
A triangular section filet weld equal leg lengths of 12mm has a throat thickness?
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0.8mm
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17mm
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9.5mm
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8.4mm
When comparing the properties of plain carbon steels and austenitic stainless steel
following statements is true?
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Carbon steels have better thermal conductivity
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Stainless steels have low expansion and contraction
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Carbon steels have higher expansion rates in the Z direction
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Stainless steels have lower chromium
Cast and helix are terms that refers to:
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Ingredients in the flux covering
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Bead deposition techniques for distortion control
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Quality of the welding wires
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Sources from which wires are drawn
Which of the following electrodes don’t requires re-baking at higher temperature
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Cellulosic types
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Vacuum packed types
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Hydrogen types
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All the types above require re-baking
Carbon dioxide shielding is NOT suitable for MAG welding of austenitic stainless
steel?
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Carbon dioxide is a heavier gas
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Carbon dioxide is an active gas
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The heat content of this gas is very high
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There is insufficient gas coverage