1. It can be used for welding any metal or their combinations because of very high temperature of the focal points. |
2. Heat affected zone is very large because of quick heating. |
3. High vacuum is required to carry the process. |
A) 1 and 2 only
B) 2 and 3 only
C) 1 only
D) 1, 2 and 3
Correct Answer: A
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