Welding Metallurgy MCQ Questions and Answers

11

Match the joining processes in Group 1 with the filler material in Group 2.

Group 1	Group 2
P. Soldering	1. Silver-titanium alloy
Q. Welding	2. Silver-tin alloy
R. Brazing	3. Mild steel
	4. Lead fluoride

A) P-2, Q-3, R-1 B) P-1, Q-2, R-3 C) P-3, Q-1, R-2 D) P-2, Q-4, R-1

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Answer & Solution

Answer: Option A

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12

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 facilitate breaking up of the oxide film on the workpiece surface.

A) a is true but r is false B) a is false but r is true C) both a and r are true, and r is the reason for a D) both a and r are true, and r is not the reason for a

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Answer & Solution

Answer: Option C

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13

"Cold cracking" in the heat affected zone of a high strength steel weld can take place because of

A) retained austenite B) martensite formation C) relatively high sulphur content in the base metal D) sufficient hydrogen present in the welding arc

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Answer & Solution

Answer: Option B

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14

Steels with high carbon equivalent have poor weldability because in these steels during welding

A) carbon and other alloying elements get oxidised from the weld pool B) excessive ferrite forms in the heat affected zone leading to the poor toughness of the weld C) martensite forms in the heat affected zone leading to poor toughness/ductility of the weld D) segregation of carbon and other elements occurs in the weld pool leading to poor properties of the weld

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Answer & Solution

Answer: Option C

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15

Which of the following is not a fusion welding process?

A) Arc welding B) Gas welding C) Resistance welding D) Friction stir welding

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Answer & Solution

Answer: Option D

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16

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

A) P > Q > R B) Q > R > P C) R > P > Q D) P > R > Q

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Answer & Solution

Answer: Option B

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17

In TIG welding thoriated tungsten electrodes are used because it

A) has higher current carrying capacity B) has better electron emissivity C) is stronger than ordinary tungsten D) is easy to prepare

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Answer & Solution

Answer: Option B

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18

In the consumable electrode shielded metal arc welding process, which of the following observations are correct?
P. The, weld composition does not depend upon the basicity of the slag.
Q. Basic flux is used to achieve low hydrogen content-and low inclusion content in the weld metal.
R. Reverse polarity of the direct current power source is used to weld thin sheets.
S. Coated electrodes are classified by tensile strength of the weld metal deposit.

A) P, Q B) P, R C) Q, S D) R, S

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Answer & Solution

Answer: Option B

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19

In an arc welding experiment, the current, voltage and electrode travel speed were 140 A, 22 V, and 15 cm/min respectively. The heat input per unit length of the weld is given by . . . . . . . . kJ/cm.

A) 24.64 B) 4.62 C) 9.24 D) 12.32

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Answer & Solution

Answer: Option D

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20

Match the welding process in Group 1 with the source of heat in Group 2.

Group 1	Group 2
P. Ultrasonic welding	1. Thermochemical
Q. Spot welding	2. Electrical resistance
R. SMAW	3. Friction
S. Thermit welding	4. Electric arc

A) P-3, Q-2, R-1, S-4 B) P-4, Q-3, R-2, S-1 C) P-1, Q-3, R-4, S-2 D) P-3, Q-2, R-4, S-1

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Answer & Solution

Answer: Option D

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Welding Metallurgy MCQ Questions and Answers | Metallurgical Engineering