GATE MT Welding Technology - Askmemetallurgy

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Askmemetallurgy Official

Asked: February 25, 2022In: Welding Technology

GATE MT 2022 Q43

Steel plates are welded autogenously using Gas Tungsten Arc welding with an arc heat transfer efficiency of 0.65. The first weld is made using a welding current of 200 A at an arc voltage of 18 V with a welding ...Read more

Steel plates are welded autogenously using Gas Tungsten Arc welding with an arc heat transfer efficiency of 0.65. The first weld is made using a welding current of 200 A at an arc voltage of 18 V with a welding speed of 0.002 ms^–1.

The second weld is made at a welding speed of 0.0022 ms^–1 with the same arc voltage. If both the welds have identical heat input, the welding current of the second weld is _____ A (round off to the nearest integer).

Askmemetallurgy Official

Asked: February 25, 2022In: Welding Technology

GATE MT 2022 Q28. Which of the following parameter(s) influence(s) the melting rate of the consumable wire in a gas metal arc welding process?

Poll Results

7.69% (A) Stick-out length ( 1 voter )

23.08% (B) Welding speed ( 3 voters )

53.85% (C) Welding current ( 7 voters )

15.38% (D) Diameter of the consumable wire ( 2 voters )

Based On 13 Votes

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Askmemetallurgy Official

Asked: February 25, 2022In: Welding Technology

GATE MT 2022 Q10. Which one of the following figures illustrates a lap joint with fillet weld?

2022 10

Askmemetallurgy Official

Asked: March 31, 2021In: Welding Technology

GATE MT 2021 Q40. A continuous fillet weld is made using a 3000 W welding machine. At a travel speed of 6 mm s-1, the cross-sectional area (in mm2) of the weld is: (round off to nearest integer). Given: The unit energy required to melt the metal is 6 J mm-3.Heat transfer factor = 0.6 Melting factor = 0.5

Askmemetallurgy Official

Asked: June 25, 2020In: Welding Technology

GATE MT 2018 Q45

The temperature profile (T in Kelvin) of an arc weld across its width is given as𝑇 = 2000 exp(−0.3𝑥2) where 𝑥 (in mm) is the distance from the weld centre. The melting point of the base material is 1500 K. ...Read more

The temperature profile (T in Kelvin) of an arc weld across its width is given as𝑇 = 2000 exp(−0.3𝑥²) where 𝑥 (in mm) is the distance from the weld centre. The melting point of the base material is 1500 K. The width of the fusion zone is _________(in mm tO two decimal places).

Askmemetallurgy Official

Asked: June 20, 2020In: Welding Technology

GATE MT 2018 Q16. Which of the following categories of materials is suitable as a filler for brazing of steel sheets?

Poll Results

10.96%(A)Epoxy resins ( 8 voters )

67.12%(B) Near-eutectic alloys ( 49 voters )

15.07%(C) Refractory alloys ( 11 voters )

6.85%(D) Large freezing range alloys ( 5 voters )

Based On 73 Votes

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Askmemetallurgy Official

Asked: June 19, 2020In: Welding Technology

GATE MT 2018 Q14.Which of the following welding processes is NOT suitable for joining thin metal sheets?

Poll Results

18.75%(A)Gas Metal Arc Welding ( 21 voters )

57.14%(B)Electro Slag Welding ( 64 voters )

12.5%(C)Electron Beam Welding ( 14 voters )

11.61%(D)Laser Beam Welding ( 13 voters )

Based On 112 Votes

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Askmemetallurgy Official

Asked: June 11, 2020In: Welding Technology

GATE MT 2019 Q24. An arc welding is performed at 400 Amperes, 20 V at a transverse speed of 5 mm/s. If the heat transfer efficiency is 0.6, the energy input per unit length( in J/mm, rounded off to the nearest integer ) during the process is ___________.

Askmemetallurgy Official

Asked: May 10, 2020In: Welding Technology

GATE MT 2020 Q29. Two plates of composition. Fc—lo wt.% Ni and Fe – 20 wt.% Cr – 5 wt.% Ni are Fusion-welded using a filler rod of composition 20 wt, % Ni – 80 wt.% Cr. Contribution to dilution of the weld pool is 20% from each plate. The Ni content in the weld pool is (round off to the nearest integer).

GATE MT 2020 Q29. Two plates of composition. Fc—lo wt.% Ni and Fe – 20 wt.% Cr – 5 wt.% Ni are Fusion-welded using a filler rod of composition 20 wt, % Ni – 80 wt.% Cr. Contribution to dilution of the weld pool is 20% from each plate. The Ni content in the weld pool is (round off to the nearest integer).

Askmemetallurgy Official

Asked: April 9, 2020In: Welding Technology

GATE MT 2016 Q21. Of the following welding processes [P] Laser Beam Welding [Q] Submerged Arc Welding [R] Metal Inert Gas Welding the width of the heat-affected zone in decreasing order is

Poll Results

12.35%(A) P > Q > R ( 10 voters )

61.73%(B) Q > R > P ( 50 voters )

12.35%(C) R > P > Q ( 10 voters )

13.58%(D) P > R > Q ( 11 voters )

Based On 81 Votes

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Askmemetallurgy Official

Asked: April 4, 2020In: Welding Technology

GATE MT 2015 Q56. Determine the correctness or otherwise of the following assertion [a]and reason[R] Assertion: In a pure metal weld, elastic modulus in heat affected zone (HAZ) is the same as that in the base metal. Reason: Coarse grained microstructrue in the HAZ results in lower hardenss.

Poll Results

9.09%(A) Both [a] and [r] are true and [r] is the correct reason of [a]. ( 3 voters )

72.73%(B) Both [a] and [r] are true and [r] is not the correct reason of [a]. ( 24 voters )

15.15%(c) Both [a] and [r] are false. ( 5 voters )

3.03%(D) [a] is true but [r] is false. ( 1 voter )

Based On 33 Votes

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Askmemetallurgy Official

Asked: April 2, 2020In: Welding Technology

GATE MT 2015 Q31. Which of the following is NOT a solid state metal joining technique?

Poll Results

15.15%(A) Ultrasonic welding ( 15 voters )

21.21%(B) Friction welding ( 21 voters )

18.18%(C) Diffusion bonding ( 18 voters )

45.45%(D) Electroslag welding ( 45 voters )

Based On 99 Votes

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Askmemetallurgy Official

Asked: March 28, 2020In: Welding Technology

GATE MT 2014 Q46. Determine the correctness or otherwise of the following Assertion (a) and Reason (r). Assertion (a): During welding of aluminium alloys by the gas tungsten arc welding process, direct current reverse polarity (DCRP) mode is used. Reason (r): DCRP facilitates breaking up of the oxide film on the workpiece surface.

Poll Results

5.26%(A) a is true but r is false ( 1 voter )

0%(B) a is false but r is true

89.47%(C) both a and r are true, and r is the reason for a ( 17 voters )

5.26%(D)both a and r are true, but r is not the reason for a ( 1 voter )

Based On 19 Votes

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Askmemetallurgy Official

Asked: March 27, 2020In: Welding Technology

GATE MT 2014 Q.22 Which one of the following welding processes uses a non-consumable electrode?

Poll Results

63.16%(A) Gas tungsten arc welding ( 60 voters )

13.68%(B) Gas metal arc welding ( 13 voters )

17.89%(C) Submerged arc welding ( 17 voters )

5.26%(D) Flux cored arc welding ( 5 voters )

Based On 95 Votes

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Askmemetallurgy Official

Asked: March 26, 2020In: Welding Technology

GATE MT 2014 Q.18 Which one of the following can avoid weld decay of austenitic stainless steels?

Poll Results

60.87%(A) Reducing carbon content ( 14 voters )

8.7%(B) Increasing carbon content ( 2 voters )

21.74%(C) Eliminating strong carbide formers ( 5 voters )

8.7%(D) Decreasing chromium content ( 2 voters )

Based On 23 Votes

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Askmemetallurgy Official

Asked: March 21, 2020In: Welding Technology

GATE MT 2013 Q25. Arc welding is done using current, voltage and welding speed of 200 A, 20 V and 0.01 m/s, respectively. The heat input in kJ per unit length is _________

Askmemetallurgy Official

Asked: March 21, 2020In: Welding Technology

GATE MT 2013 Q19. For a good quality brazing, the molten filler alloy should have

Poll Results

58.33%(A) low contact angle with the base metal ( 14 voters )

29.17%(B) low density ( 7 voters )

12.5%(C) high surface tension ( 3 voters )

0%(D) high viscosity

Based On 24 Votes

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Askmemetallurgy Official

Asked: March 16, 2020In: Welding Technology

GATE MT 2012 Q.22 Which of the following is NOT a fusion welding process?

Poll Results

5.05%(A) Arc welding ( 10 voters )

10.1%(B) Gas welding ( 20 voters )

29.29%(C) Resistance welding ( 58 voters )

55.56%(D) Friction stir welding ( 110 voters )

Based On 198 Votes

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Askmemetallurgy Official

Asked: March 14, 2020In: Welding Technology

GATE MT 2011 Q24. The nature of submerged arc welding flux with basicity index of 0.5 is

Poll Results

0%(A) neutral

27.78%(B) Basic ( 5 voters )

11.11%(C) semi-basic ( 2 voters )

61.11%(D) acidic ( 11 voters )

Based On 18 Votes

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Askmemetallurgy Official

Asked: March 13, 2020In: Welding Technology

GATE MT 2011 Q9. In a brazing process the liquid metal fills the gap by which one of the following means?

Poll Results

81.25%(A) Capillary infiltration ( 39 voters )

12.5%(B) Gravity infiltration ( 6 voters )

4.17%(C) Pressure infiltration ( 2 voters )

2.08%(D) Vacuum infiltration ( 1 voter )

Based On 48 Votes

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