question_answer

Consider the following statements in respect of oxydiacetylene welding:

1. The joint is not heated to a state of fusion.

2. No pressure is used.

3. Oxygen is stored in steel cylinder at a pressure of 14 MPa

4. When there is an excess of acetylene used, there is decided change in the appearance of flame.

Which of the statements given above are correct?

A) 1, 2 and 3                     

B) 2, 3 and 4        

C) 1, 3 and 4                     

D) 1, 2 and 4