3) Which one of the following is used to convert AC to DC supply in a welding machine?

4) What is the metal used to make earth clamp in a welding machine?

5) How much current should be set, to weld a 10 mm thick plates, by arc welding?

6) What is the term for the depth of fusion, from the surface of the weld metal plate?

7) What should be the angle for a double bevel butt joint?