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
Answer: Option D
This Question Belongs to Metallurgical Engineering >> Welding Metallurgy
Stainless steel is welded using
A. oxy-acetylene flame
B. oxy-hydrogen flame
C. arc welding
D. inert gas arc welding
The nature of submerged arc welding flux with basicity index of 0.5 is
A. neutral
B. basic
C. semi-basic
D. acidic
Lap joints are preferred over butt joints in soldering/brazing because
A. these are weaker in tension but stronger in shear
B. these are weaker in shear but stronger in tension
C. these are stronger in both shear and tension
D. the lap joints are easily made
For a good quality brazing, the molten filler alloy should have
A. low contact angle with the base metal
B. low density
C. high surface tension
D. high viscosity
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