GTAW & TIG welding MCQ 1 to 100, - your questions answered

 GTAW & TIG welding MCQ 1 to 100

TIG welding MCQ 

 GTAW & TIG welding MCQ 1 to 100, - your questions answered

GTAW or TIG welding

1. The welding process shown in fig. is…
a) TIG
b) MIG
c) SMAW
d) SAW

2. What is the boiling point of tungsten?
a) 4500°C
b) 5950°C
c) 6404°C
d) 3330°C

3. What is the melting point of tungsten?
a) 3380°C
b) 2000°C
c) 5404°C
d) 1404°C

4. What is meant by GTAW welding?
a) Gun tantalum arc welding
b) Gas tungsten arc welding
c) General tin arc welding

5. In TIG/GTAW welding, which type of electrodes is used?
a) Non-consumable electrode
b) Cored electrode
c) Continuous consumable wire electrode
d) Stick electrode
6. Name the parts of the TIG welding torch? Identify the part ‘B’
a) Nozzle
b) Handle
c) Tungsten electrode
d) Gas hose
7. Which of the following arc welding processes does not use consumable electrodes?
a) GMAW
b) GTAW
c) SAW
d) SMAW
8. Which of the following is the odd out?
a) Neon
b) Xenon
c)Argon
d) Nitrogen
9. In Gas tungsten arc welding (TIG) the following polarity is used for welding Aluminium?
a) Direct current straight polarity (DCSP)
b) Direct current reverse polarity (DCRP)
c) Alternating Current
d) All of the above
10. Argon is used in the welding of stainless steel because:
a) It is inert
b) It helps in melting the electrode
c) It prevents undercut
d) It is cheap
11. It is a non-consumable electrode having a high melting point. It is used in TIG welding. What is the name of this electrode?
a) Carbon electrode
b) Copper electrode
c) Aluminum electrode
d) Tungsten electrode
12. Which one of the following is a commonly used shielding gas in TIG welding?
a) Carbon dioxide
b) Nitrogen
c) Argon
d) Hydrogen
13. An inert gas cylinder is used in the TIG welding process. What is the color of the inert gas cylinder?
a) Black
b) Peacock blue
c) Maroon
d) Red
14. What are the two most commonly inert gases used in TIG welding?
a) Argon & carbon dioxide
b) Helium & carbon dioxide
c) Carbon dioxide & nitrogen
d) Argon & helium
15. What is the atomic weight of argonshielding gas?
a) 40
b) 4
c) 14
d) 44
16. What is the atomic weight of heliumshielding gas?
a) 40
b) 4
c) 14
d) 44
17. Which type of power source used in MIG/MAG welding?
a) Constant voltage type
b) Constant current type
c) Constant voltage or current type
d) None of the above
18. Down slope in TIG welding will helps to prevent…
a) Uneven cooling of weld pool
b) Undercut
c) cracks
d) Distortion
19. What is the name of electronic unit thathelps to initiate the arc in TIG weldingprocess?
a) Low frequency
b) Medium frequency
c) High frequency
d) Double frequency
20. What is the colour code of 2% thoriumadded tungsten electrodes?
a) Green
b) Blue
c) Red
d) White
21. What is the colour code of pure tungstenelectrode?
a) Green
b) Blue
c) Red
d) White
22. What is the function of post flow in TIGwelding?
a) To protect TIG welding torch
b) To protect the end of the weld
c) To protect the cooling down of tungsten
d) Both b and c
23. Helium shielding gas having higher flowrates as compared to argon because…
a) helium is extracted from natural gas
b) atomic weight is 40
c) helium is lighter than air
d) none of the above
24. Which of the following is not an inert gas?
a) Argon
b) Xenon
c) Carbon dioxide
d) Helium
25. Why is welding is shielded?
a) To eliminate hydrogen
b) To retard the cooling rate of the weld
c) To eliminate the atmospheric air
d) To ensure maximum heat input
26. What is the colour code of throiatedelectrode with a 0.9 - 1.2 % thorium oxide?
a) Orange
b) Black
c) Gray
d) Yellow
27. What does HF stand for in TIG welding
a) High frequency
b) High free
c) Hydrogen frequency
d) Helium free
28. Argon shielding gas having lower flow ratesas compared to helium because…
a) obtained from the atmosphere by
liquification of air
b) atomic weight is 4
c) argon is heavier than air
d) none of the above
29. In GTAW(TIG), which polarity is most widelyused:
a) Direct current straight polarity (DCSP)
b) Direct current reverse polarity (DCRP)
c) Alternating Current
d) All of the above
30. What is the colour code of Zirconiatedtungsten electrode with a 0.15 – 0.4 %zirconiumoxide?
a) Orange
b) Black
c) Brown
d) Yellow
31. Which tungsten electrode is used forwelding of non-alloyed & low alloyed steels aswell as stainless steels?
a) Thoriated tungsten electrode
b) Zirconated tungsten electrode
c) Pure tungsten electrode
d) None of the above
32. Which tungsten electrode is used forwelding of aluminium & magnesium alloys?
a) Thoriated tungsten electrode
b) Zirconated tungsten electrode
c) Pure tungsten electrode
d) Both b & c
32. TIG welding is best suited for welding…
a) Aluminium
b) Mild steel
c) Copper alloys
d) Galvanized steel
33. Argon gas is best suited for welding thinnermetals because…
a) High arc voltage
b) Low gas volume
c) Low arc voltage
d) High gas volume
34. Helium gas is best suited for welding thickermetals because…
a) High arc voltage
b) Low gas volume
c) Low arc voltage
d) High gas volume
35. What is the type of shielding gas for GTAW(Gas Tungsten Arc Welding) used for carbonsteels only called?
a) Argon - H₂
b) Argon - CO₂
c) Argon - Helium
d) Helium
36. Argon gas is normally superior to helium gasbecause…
a) Lower cost
b) More availability
c) Better for welding dissimilar metals
d) All of the above
37. In pulsed TIG welding, the supply current is
not constant and it is being fluctuated from
low level to high level, which results in
a) Distortion effect is less
b) Distortion effect is more
c) Both a &b
d) None of the above
37. Helium shielding gas is better for welding at
a) Lower speed
b) Higher speed
c) Normal speed
d) Constant speed
38. Argon shielding gas is better for welding at
a) Lower speed
b) Higher speed
c) Normal speed
d) Constant speed
39. The main disadvantage of TIG weldingprocess is…
a) No spattering
b) No post weld cleaning
c) Less Productivity
d) Narrow HAZ
40. Nozzle used in TIG welding is made up of…
a) Metallic
b) Plastic
c) Copper
d) Ceramic
41. Helium is _________ times lighter than
argon
a) Six
b) Eight
c) Ten
d) Twelve
42. For higher duty cycle operations usingmaximum welding current upto 500 amps,whichtype of torch is required?
a) Air cooled
b) Ice cooled
c) Water cooled
d) Both a and C
43. What is the effect in welding of stainlesssteel if tungsten electrode is connected topositive terminal in TIG welding?
a) Lack of penetration
b) Poor penetration
c) Porosity
d) Crack
44. What is the shape of tip of then electrodeused in TIG welding for DC machine?
a) Spherical end
b) Pointed end
c) Flat end
d) Angle end
45. In TIG welding, what is the shape of the tipof tungsten electrode used for welding ofaluminium?
a) Pointed end
b) Flat end
c) Spherical end
d) Angular end
46. In TIG welding, what is the shape of the tipof tungsten electrode used for welding ofmild steel?
a) Flat end
b) Pointed end
c) Spherical end
d) Angular end
47. In TIG welding, what is the function of flowswitch in the water line?
a) To remove slag formation from the base
metal
b) To shield the weld area
c) To initiate the arc without touching the work
piece
d) To switch off the power supply, if any failurein the water circulation
48. In TIG welding, if the thickness of plate tobe welded increases, the size of torch andelectrode diameter must…
a) Decreases
b) Remains same
c) Increases
d) Neither increase nor decrease
49. What is the name of the defect, if the tungsten electrode tip melts & deposit insidetheweld bead?
a) Poor penetration
b) Undercut
c) Tungsten inclusion
d) Lack of fusion
50. Which of the following electrodes & current types may be used for the TIG welding of nickel & its alloys?
a) Zirconium electrode, AC
b) Thorium electrode, DC +ve
c) Cerium electrode, DC –ve
d) All of the above
51. What is the expansion of GTAW?
a) Gas tube arc welding
b) General tungsten arc welding
c) Gas Tungsten arc welding
d) Gas tip arc welding
52. What is the tungsten electrode used for carbon steel & low alloy steel TIG welding?
a) 5% thoriated tungsten electrode
b) 2% thoriated tungsten electrode
c) 5% zirconiated tungsten electrode
d) 2% zirconiated tungsten electrode
53. Inert gases which one produces the deepestpenetration in TIG welding process?
a) Oxygen
b) Helium
c) CO2
d) Argon
54. Out of the following inert gas produceswider penetration profile in TIG welding process?
a) Argon
b) Oxygen
c) Helium
d) CO2
55. At one end of the tungsten electrode colouridentification given for easy selection.What is the colour of 2% thorium addedtungsten electrode?
a) Green
b) Yellow
c) Red
d) Brown
56. At one end of the tungsten electrode, color identification is given for easy selection. What is the color identification of 1%zirconium added tungsten electrode?
a) Red
b) Brown
c) Green
d) Yellow
57. At one end of the tungsten electrode, color identification is given for easy selection. What is the color identification of pure tungsten electrode?
a) Red
b) Green
c) Yellow
d) Brown
58. What is the type of power source polarity is used to weld Aluminium, magnesium, and their alloys in TIG welding?
a) DC
b) AC/DC
c) AC
d) HWAC
59. The normal rage flow rate of shielding gas used in TIG welding is...
a) 1- 4 litres/minute
b) 2-7 litres/minute
c) 10-15 litres/minute
d) 15-20 litres/minute
60. Why alternating current is preferred for welding aluminum using TIG welding?
a) It gives stability and cleaning action
b) It allows high welding speed
c) It avoids weld cracks
d) It gives a good bead profile
61. What is the recommended type of current while welding with a zirconium added tungsten electrode?
a) AC
b) DC
c) AC/DC
d) All of the above
62. What is the recommended type of current while welding with thorium added tungsten electrode?
a) AC
b) DC
c) AC/DC
d) HWAC
63. Identify inert gases in the following list used for TIG welding process...
a) Oxygen
b) Nitrogen
c) Helium
d) Hydrogen
64. About the advantage of pulsed TIGwelding, which statement is correct?
a) Easy to use on thick metals
b) Less distortion
c) Parameter control is easy
d) Deep penetration can be obtained
65. The linear rate at which the arc moves
along the joint is called...
a) Arc travel speed
b) Stick out
c) Arc length
d) Transfer
66. Which type of weld defect occurs on the joint due to less flow rate of shielding gas?
a) Crack
b) Undercut
c) Overlap
d) Porosity
67. During the TIG welding process, the tip of the electrode touched the base metal and blunted. What defect will present in Base metal?
a) Oxide inclusion
b) Slag inclusion
c) Tungsten inclusion
d) Porosity
68. What is the physical property of the property of argon gas?
a) Colourless & tasteless
b) Reactive
c) Burning
d) Supports burning
69. The arc temperature produced in the TIGwelding process is...
a) 6000°C
b) 10000°C
c) 20000°C
d) 3000°C
70. What is the type of starting method shown in figure?
a) Lift arc start
b) Scratch start
c) Dip start
d) High-frequency start
71. What is the upslope setting in TIG welding current control?
a) The gas reaching time
b) HF starting time
c) The time taken for welding current to reach the maximum
d) Gas flow rate
72. What is the post flow setting in TIG welding?
a) Time taken for shielding gas to stay after the current stopped
b) The time taken for welding current to reach
the maximum
c) The gas reaching time
d) HF starting time
73. What is the function of Collet as a part of the TIG welding torch?
a) To hold the tungsten electrode
b) To supply gas
c) To supply current
d) To supply cooling water

74. What is the reason for using the purging method in pipe welding?
a) To replace the air in the pipeline with inert gas
b) To Clean the pipe
c) To remove the moisture
d) To remove oxide
75. The reason for the formation of yellow color in ceramic Nozzle during TIG welding is...
a) Incorrect arc length
b) The shielding gas flow rate is too low
c) Contaminated filler rod
d) Excessive heating of torch
76. During TIG welding the tungsten starts melting. What is the reason?
a) Operating on electrode positive polarity
b) Insufficient shielding gas
c) The current is too high
d) Welding speed is fast
77. In DC TIG welding if you operate with electrode positive polarity, what will happen?
a) Electrode will starts melting
b) No welding will take place
c) The base plate will be contaminated
d) Current will stop
78. Why alternating current is preferred for welding aluminum using TIG welding?
a) It gives stability and cleaning action
b) It allows high welding speed
c) It avoids weld cracks
d) It gives a good bead profile
79. What is the recommended type of metal while welding with thorium added tungsten electrode?
a) Mild steel & alloy steels
b) Aluminum alloys
c) Magnesium alloys
d) Refractive metals

80. In the welding of the butt joint from one side,
which of the following controls the profile of
the root bead?
a) Root Face
b) Bevel Angle
c) Root Gap
d) One of the above
81. What is the recommended type of metal
while welding with zirconium added tungsten
electrode?
a) Mild steel & alloy steels
b) Aluminum & Magnesium alloys
c) Copper
d) Stainless Steel
82. As per the following figure, the taper
shaped tungsten electrode grinding is
recommended for what type of current?
a) AC
b) Both AC and DC
c) DC
d) HWDC
83. As per the following figure, ball end type
tungsten electrode grinding is recommended
for what type of metal?
a) Aluminum & Magnesium alloys
b) Both a & b
c) All of the above
d) Mild steel & alloy steels
84. The characteristics of the power source used in
TIG welding is...
a) Constant current
b) Constant voltage
c) CC/CV
d) None of the above
85. TIG welding is used where _________is
more important than productivity.
a) Quality
b) Quantity
c) Mass production
d) Portability
86. What is the size of a gas nozzle for 1.5mm
dia. tungsten electrode in TIG welding
process?
.a) 10 mm dia
b) 12 mm dia.
c) 14 mm dia.
d) 16 mm dia
87. Which defect would you expect to obtain in
TIG welds in non-deoxidized steel?
a) Undercut
b) Porosity
c) Tungsten inclusions
d) Linear misalignment
88. The main reason for using a back purge
when welding stainless steel with TIG welding
process is to…
a) Improve positional welding
b) Prevent the possibility of porosity
c) Prevent excessive root penetration
d) Prevent the formation of dense oxide layer
forming in the root
89. Which defect may occur in the weld bead, if the
shielding gas is insufficient in TIG welding?
a) Porosity
b) Undercut
c) Tungsten inclusion
d) Cracking
90. Which defect may occur in the weld bead, if the
edge preparation and current level is
incorrect in TIG welding?
a) Cracking
b) Blowholes
c) Lack of penetration
d) Porosity
91. Choosing of correct current and electrode in
TIG welding depends upon:
) type & thickness of metal to be welded
b) type of shielding gas
c) diameter of electrode & type of electrode
d) all of the above
92. In TIG welding, if DC electrode positive
(DCEP) is used for welding it results in...
a) More penetration
b) Oxide inclusion or lack of fusion
c) Undercut
d) poor penetration & overheating of the torch
93. Which of the following ray is not produced
during welding?
a) Gamma rays
b) Visible light rays
c) Infrared ray
d) Ultraviolet rays
94. As per AWS classification of TIG welding
electrode – EW Th-1, ‘W’ stands for
a) Electrode
b) Chemical formula of tungsten
c) Thoriated tungsten
d) Welding strength
95. For TIG welding, what benefit does
current slop-out device have?
a) it reduces tungsten spatter
b) it reduces the risk of crater cracking
c) it reduces the risk of arc strikes
d) it reduces the inter pass temperature
96. The percentage of alloying element in
tungsten electrode helps to…
a) Increases electrode life
b) Stabilizes the arc
c) Both a and b
d) None of the above
97. Which of the following defect occur, when
welding metals like aluminum &
magnesium with straight polarity?
a) Oxide inclusion or lack of fusion
b) Porosity
c) Incomplete fusion
d) Burn through

98. What is the heat balance in the arc using
DCEN polarity in TIG welding?
a) 50% at work and 50% at the electrode
b) 70% at work and 30% at the electrode
c) 30% at work and 70% at the electrode
d) 90% at work and 10% at an electrode

99. While using AC in TIG welding, what is the
heat balance in the arc?
a) 50% at work and 50% at the electrode
b) 70% at work and 30% at the electrode
c) 30% at work and 70% at the electrode
d) 90% at work and 10% at an electrode

100. Which of the following gas mixtures is not
used in gas tungsten arc welding (TIG)?
a) Argon-Helium
b) Argon-Nitrogen
c) Argon-Hydrogen
d) Argon-Carbon dioxide

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