Previous Years GATE Questions on Joining Process 2001-2004

Solved GATE Questions on Joining Process

Question 1. Resistance spot welding is performed on two plates of 1.5 mm thickness with 6 mm diameter electrode, using 15000 A current for a time duration of 0.25 seconds. Assuming the interface resistance to be 0.0001Ω, the heat generated to form the weld is

(A) 5625 W-sec

(B) 8437 W-sec

(C) 22500 W-sec

(D) 33750 W-sec


Hint 1. (Ans A)

Heat generated,

Question 2. Two plates of the same metal having equal thickness are to be butt welded with the electric arc. When the plate thickness changes, welding is achieved by

(A) Adjusting the current

(B) Adjusting the duration of current

(C) Changing the electrode size

(D) Changing the electrode coating


Hint 2. (Ans C)

Question 3. The temperature of a carburizing flame in gas welding is ……….. that of a neutral or an oxidizing flame.

(A) lower than

(B) higher than

(C) equal to

(D) unrelated to


Hint 3. (Ans B)

Question 4. Which of the following arc welding processes does not use consumable electrodes?



(C) Submerged Arc Welding

(D) None of these


Hint 4. (Ans B)

Question 5. Match the following


Work material Type of joining
P. Aluminium 1. Submerged Arc Welding
Q. Die Steel 2. Soldering
R. Copper Wire 3. Thermit Welding
S. Titanium sheet 4. Atomic Hydrogen Welding
  5. Gas Tungsten Arc Welding
  6. Laser Beam Welding


(A) P-2   Q-5   R-1   S-3

(B) P-6   Q-3   R-4   S-4

(C) P-4   Q-1   R-6   S-2

(D) P-5   Q-4   R-2   S-6


Hint 5. (Ans D)

Question 6. In oxyacetylene gas welding, temperature at the inner core of the flame is around

(A) 3500

(B) 3200 

(C) 2900 

(D) 2550 


Hint 6. (Ans B)

Question 7. A soldering operation was work-sampled over two days (16 hours) during which an employee soldered 108 joints. Actual working time was 90 % of the total time and he performance rating was estimated to be 120 percent. If the contract provides allowance of 20 percent of the total time available, the standard time for the operation would be

(A) 8 min

(B) 8.9 min

(C) 10 min

(D) 12 min


Hint 7. (Ans D)

Question 8. Two 1 mm thick steel sheets are to be spot welded with a current of 5000 A. Assuming effective resistance to be 200 micro-ohms and current flow time of 0.2 second, heat generated during the process will be

(A) 0.2 joule

(B) 1 joule

(C) 5 joule

(D) 1000 joules


Hint 8. (Ans D)

Heat generator during the process

Answer Keys

1. (A)   2. (C)   3. (B)   4. (B)   5. (D)   6. (B)   7. (D)   8. (D)   9. (C)   10. (D)   11. (B)   12. (C)   13. (A)   14. (C)   15. (B)   16. (C)   17. (C)   18. (A)

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