Q:- Why is the arc shielded. When using an arc welding process?

A. To eliminate the colling from the arc 
B. To retarded cooling rate of solidify metal 
C. To excluded the atmosphere from the arc region 
D. The arc not always shielded when using an arc welding process 

Q:- Cast and helix are terms that refers to

A. Ingredients in the flux coating
B. Bead deposition techniques for distortion control
C.quality of the welding wires
D. Sources from which wires are drawn 

Q:- Undercutting adjacent to the final bead on the outside of production pipe welds shall:

1. Not be permitted
2. Not be more than 1/32 inch or 12.5% of the pipe wall thickness, whichever is smaller
3. Not be more than 1/8 inch or 6% of the pipe wall thickness, whichever is smaller
4. Always be acceptable if the inspector does not see it
5. None of the above