Latest TIG Welding Questions And Answers

Here you can take a free TIG Welding Quiz Course Practice Test with the Latest GTAW TIG Welding Questions and Answers.

1.

The color of pure tungsten electrode is ___________

 A. Red

 B. White

 C. Green

 D. Gray

2.

In the TIG process, the function of the tungsten electrode is ___________

 A. To provide filler metal to the joint

 B. To provide a shielding effect

 C. To conduct electric current to the arc

 D. Both (a) and (b)

3.

Which of the weld defects are most common in TIG welding?

 A. Porosity

 B. Tungsten inclusions

 C. Crack

 D. Slap inclusion

4.

Color of 2% Thoriated Tungsten electrode is ___________

 A. Red

 B. Green

 C. Pink

 D. White

5.

What unit is required in the GTAW process to strike the arc?

 A. DC suppressor unit

 B. HF unit

 C. Flint lighter

 D. Anyone of these

6.

The best way to find gas leakage

 A. By flame

 B. By sniff

 C. By matchstick

 D. By soap solution

7.

GTAW uses a consumable steel electrode.

 A. True

 B. False

8.

GTAW torches used for welding over 200 amps should be water-cooled

 A. True

 B. False

9.

The gas cup size used is determined by the diameter of the tungsten electrode required

 A. True

 B. False

10.

The torch is held at a 45-degree angle when welding a T-Joint in a horizontal position.

 A. True

 B. False

11.

Which of the following statements is/are true for the welding process?

 A. Generally welding equipments are very costly

 B. TIG Welding results in residual stresses and distortion of the workpiece

 C. Two dissimilar metals cannot be joined by welding

 D. All of the above

12.

TIG Welding denotes –

 A. Torch inclined Gas Welding

 B. Torch included Gas Welding

 C. Tungsten Inert Gas Welding

 D. All of the above Welding

13.

The presence of dirt, oil, and oxides on the base metal cause

 A. Porosity

 B. Incomplete fusion

 C. Crack

 D. Burn through

14.

Argon Cylinder is painted with

 A. Maroon colour

 B. Black colour

 C. Red colour

 D. Peacock Blue colour

15.

The function of a gas regulator is to

 A. Reduce the cylinder pressure to working pressure

 B. Mix the gases in the required proportion

 C. Change the volume of gas flowing into the blowpipe

 D. Convert the liquid into gases

16.

The most commonly used shielding gas in TIG Welding is –

 A. Helium

 B. Argon

 C. Krypton

 D. Xenon

17.

If the job is in the Positive terminal and the Electrode is in the negative terminal then it will come under which polarity

 A. Reverse Polarity

 B. Straight Polarity

 C. Both

 D. None of these

18.

TIG Welding is preferred because ___________

 A. It is less costly

 B. Arc control is very easy

 C. It can be used for all position welding

 D. It is a very fast welding process

19.

For TIG welding of Aluminium, following current and polarity used is ___________

 A. A.C.

 B. DCEN

 C. DCEP

 D. All of these

20.

TIG welding power sources are of ___________

 A. Constant current type

 B. Constant voltage type

 C. Anyone of these

 D. Power source is not required

21.

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

22.

Which one of the following is a commonly used shielding gas in TIG welding?

 a) Carbon dioxide

 b) Nitrogen

 c) Argon

 d) Hydrogen

23.

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

24.

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

25.

What is the atomic weight of argon shielding gas?

 a) 40

 b) 4

 c) 14

 d) 44

26.

What is the atomic weight of helium shielding gas?

 a) 40

 b) 4

 c) 14

 d) 44

27.

Which type of power source is used in MIG/MAG welding?

 a) Constant voltage type

 b) Constant current type

 c) Constant voltage or current type

 d) None of the above

28.

Down slope, in TIG welding will help to prevent…

 a) Uneven cooling of the weld pool

 b) Undercut

 c) cracks

 d) Distortion

29.

What is the name of the electronic unit that helps to initiate the arc in the TIG welding process?

 a) Low frequency

 b) Medium frequency

 c) High frequency

 d) Double frequency

30.

What is the color code of 2% thorium-added tungsten electrodes?

 a) Green

 b) Blue

 c) Red

 d) White

31.

The welding process is shown in fig. is…

 a) TIG

 b) MIG

 c) SMAW

 d) SAWa

32.

What is the boiling point of tungsten?

 a) 4500°C

 b) 5950°C

 c) 6404°C

 d) 3330°C

33.

What is the melting point of tungsten?

 a) 3380°C

 b) 2000°C

 c) 5404°C

 d) 1404°C

34.

What is meant by GTAW welding?

 a) Gun tantalum arc welding

 b) Gas tungsten arc welding

 c) General tin arc welding

35.

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

36.

Name the parts of the TIG welding torch. Identify the part ‘B’

 a) Nozzle

 b) Handle

 c) Tungsten electrode

 d) Gas hose

37.

Which of the following arc welding processes does not use consumable electrodes?

 a) GMAW

 b) GTAW

 c) SAW

 d) SMAW

38.

Which of the following is the odd out?

 a) Neon

 b) Xenon

 c) Argon

 d) Nitrogen

39.

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

40.

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

41.

Which tungsten electrode is used for welding of non-alloyed & low-alloyed steels as well as stainless steels?

 a) Thoriated tungsten electrode

 b) Zirconated tungsten electrode

 c) Pure tungsten electrode

 d) None of the above

42.

Which tungsten electrode is used for welding aluminum and magnesium alloys?

 a) Thoriated tungsten electrode

 b) Zirconated tungsten electrode

 c) Pure tungsten electrode

 d) Both b & c

43.

TIG welding is best suited for welding…

 a) Aluminium

 b) Mild steel

 c) Copper alloys

 d) Galvanized steel

44.

Argon gas is best suited for welding thinner metals because…

 a) High arc voltage

 b) Low gas volume

 c) Low arc voltage

 d) High gas volume

45.

Helium gas is best suited for welding thicker metals because…

 a) High arc voltage

 b) Low gas volume

 c) Low arc voltage

 d) High gas volume

46.

What is the type of shielding gas for GTAW(Gas Tungsten Arc Welding) used for carbon steels only called?

 a) Argon – H₂

 b) Argon – CO₂

 c) Argon – Helium

 d) Helium

47.

Argon gas is normally superior to helium gas because.

 a) Lower cost

 b) More availability

 c) Better for welding dissimilar metals

 d) All of the above

48.

In pulsed TIG welding, the supply current is not constant and it fluctuates 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

49.

Helium shielding gas is better for welding at

 a) Lower speed

 b) Higher speed

 c) Normal speed

 d) Constant speed

50.

The main disadvantage of the TIG welding process is.

 a) No spattering

 b) No post-weld cleaning

 c) Less Productivity

 d) Narrow HAZ

51.

Argon shielding gas is better for welding at

 a) Lower speed

 b) Higher speed

 c) Normal speed

 d) Constant speed

52.

The nozzle used in TIG welding is made up of…

 a) Metallic

 b) Plastic

 c) Copper

 d) Ceramic

53.

What is the color code of pure tungsten electrodes?

 a) Green

 b) Blue

 c) Red

 d) White

54.

What is the function of post-flow in TIG welding?

 a) To protect the TIG welding torch

 b) To protect the end of the weld

 c) To protect the cooling down of tungsten

 d) Both b and c

55.

Helium shielding gas has higher flow rates 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

56.

Helium shielding gas has higher flow rates 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

57.

Which of the following is not an inert gas?

 a) Argon

 b) Xenon

 c) Carbon dioxide

 d) Helium

58.

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

59.

What is the color code of a thoriated electrode with a 0.9 – 1.2 % thorium oxide?

 a) Orange

 b) Black

 c) Gray

 d) Yellow

60.

What does HF stand for in TIG welding

 a) High-frequency

 b) High free

 c) Hydrogen frequency

 d) Helium free

61.

Argon shielding gas has lower flow rates as compared to helium because…

 a) obtained from the atmosphere by liquefaction of air

 b) atomic weight is 4

 c) argon is heavier than air

 d) none of the above

62.

In GTAW(TIG), which polarity is most widely used:

 a) Direct current straight polarity (DCSP)

 b) Direct current reverse polarity (DCRP)

 c) Alternating Current

 d) All of the above

63.

What is the color code of a Zirconiatedtungsten electrode with a 0.15 – 0.4 %zirconiumoxide?

 a) Orange

 b) Black

 c) Brown

 d) Yellow

64.

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

65.

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

66.

Inert gases which one produces the deepest penetration in the TIG welding process?

 a) Oxygen

 b) Helium

 c) CO2

 d) Argon

67.

Out of the following inert gas produces a wider penetration profile in the TIG welding process?

 a) Argon

 b) Oxygen

 c) Helium

 d) CO2

68.

At one end of the tungsten electrode color identification is given for easy selection. What is the color of the 2% thorium-added tungsten electrode?

 a) Green

 b) Yellow

 c) Red

 d) Brown

69.

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

70.

At one end of the tungsten electrode, color identification is given for easy selection. What is the color identification of pure tungsten electrodes?

 a) Red

 b) Green

 c) Yellow

 d) Brown

71.

What is the type of power source polarity used to weld Aluminium, magnesium, and their alloys in TIG welding?

 a) DC

 b) AC/DC

 c) AC

 d) HWAC

72.

The normal rage flow rate of shielding gas used in TIG welding is…

 a) 1- 4 liters/minute

 b) 2-7 litres/minute

 c) 10-15 litres/minute

 d) 15-20 litres/minute

73.

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

74.

Helium is _________ times lighter than argon

 a) Six

 b) Eight

 c) Ten

 d) Twelve

75.

For higher duty cycle operations using maximum welding current up to 500 amps, which type of torch is required?

 a) Air cooled

 b) Ice cooled

 c) Water cooled

 d) Both a and C

76.

What is the effect in welding of stainless steel if a tungsten electrode is connected to a positive terminal in TIG welding?

 a) Lack of penetration

 b) Poor penetration

 c) Porosity

 d) Crack

77.

What is the shape of the tip of the electrode used in TIG welding for the DC machine?

 a) Spherical end

 b) Pointed end

 c) Flat end

 d) Angle end

78.

In TIG welding, what is the shape of the tip of the tungsten electrode used for welding aluminum?

 a) Pointed end

 b) Flat end

 c) Spherical end

 d) Angular end

79.

In TIG welding, what is the shape of the tip of the tungsten electrode used for welding of mild steel?

 a) Flat end

 b) Pointed end

 c) Spherical end

 d) Angular end

80.

In TIG welding, what is the function of the flow switch 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 workpiece

 d) To switch off the power supply, if any failure in the water circulation

81.

In TIG welding, if the thickness of the plate to be welded increases, the size of the torch and electrode diameter must…

 a) Decreases

 b) Remains the same

 c) Increases

 d) Neither increase nor decrease

82.

What is the name of the defect, if the tungsten electrode tip melts & deposits inside the weld bead?

 a) Poor penetration

 b) Undercut

 c) Tungsten inclusion

 d) Lack of fusion

83.

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

84.

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

85.

What is the post-flow setting in TIG welding?

 a) Time is 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

86.

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

87.

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

88.

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

89.

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

90.

In DC TIG welding if you operate with electrode positive polarity, what will happen?

 a) Electrode will start melting

 b) No welding will take place

 c) The base plate will be contaminated

 d) Current will stop

91.

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

92.

What is the recommended type of metal while welding with a thorium-added tungsten electrode?

 a) Mild steel & alloy steel

 b) Aluminum alloys

 c) Magnesium alloys

 d) Refractive metals

93.

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

94.

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

95.

What is the recommended type of current while welding with thorium-added tungsten electrode?

 a) AC

 b) DC

 c) AC/DC

 d) HWAC

96.

Identify inert gases in the following list used for the TIG welding process…

 a) Oxygen

 b) Nitrogen

 c) Helium

 d) Hydrogen

97.

About the advantage of pulsed TIG welding, 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

98.

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

99.

Which type of weld defect occurs on the joint due to the lower flow rate of shielding gas?

 a) Crack

 b) Undercut

 c) Overlap

 d) Porosity

100.

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

101.

What is the physical property of the property of argon gas?

 a) Colourless & tasteless

 b) Reactive

 c) Burning

 d) Supports burning

102.

The arc temperature produced in the TIG welding process is…

 a) 6000°C

 b) 10000°C

 c) 20000°C

 d) 3000°C

103.

What is the type of starting method shown in the figure?

 a) Lift arc start

 b) Scratch start

 c) Dip start

 d) High-frequency start

104.

Choosing of correct current and electrode in TIG welding depends upon:

 a) type & thickness of metal to be welded

 b) type of shielding gas

 c) diameter of electrode & type of electrode

 d) all of the above

105.

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

106.

Which of the following rays is not produced during welding?

 a) Gamma rays

 b) Visible light rays

 c) Infrared ray

 d) Ultraviolet rays

107.

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

108.

For TIG welding, what benefit does the 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

109.

The percentage of alloying element in tungsten electrodes helps to…

 a) Increases electrode life

 b) Stabilizes the arc

 c) Both a and b

 d) None of the above

110.

Which of the following defects 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

111.

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

112.

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

113.

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

114.

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

115.

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

116.

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

117.

The characteristics of the power source used in TIG welding are…

 a) Constant current

 b) Constant voltage

 c) CC/CV

 d) None of the above

118.

TIG welding is used where _________is more important than productivity.

 a) Quality

 b) Quantity

 c) Mass production

 d) Portability

119.

What is the size of a gas nozzle for a 1.5mm dia. tungsten electrode in the TIG welding process?

 a) 10 mm dia

 b) 12 mm dia

 c) 14 mm dia

 d) 16 mm dia

120.

Which defect would you expect to obtain in TIG welds in non-deoxidized steel?

 a) Undercut

 b) Porosity

 c) Tungsten inclusions

 d) Linear misalignment

121.

The main reason for using a back purge when welding stainless steel with the 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 a dense oxide layer forming in the root

122.

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

123.

Which defect may occur in the weld bead, if the edge preparation and current level are incorrect in TIG welding?

 a) Cracking

 b) Blowholes

 c) Lack of penetration

 d) Porosity

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