question_answer

Which of the following statements is/arc correct in respect of welding of two pieces in upset welding?

1. The ends to be welded should touch each other before current is switched

2. The ends to be welded should touch each other after current is switched on.

3. The two pieces have to be pressed together after desired welding temperature is reached.

Select the correct answer using the code given below:

A) 1 only              

B) 1 and 3

C) 2 only              

D) 2 and 1