Question

3.) when welding, the flux on an electrode *
a.) forms a gas
b.) creates slag
c.) shields a weld
d.) all of these

Explanation:

During welding, the flux on an electrode has multiple functions. It decomposes to form a gas that protects the weld area from atmospheric contamination (shields the weld). As the welding process occurs, it also reacts to create slag which covers the weld bead, providing additional protection during cooling and solidification. So all the mentioned functions (forming gas, creating slag, shielding the weld) are true for electrode flux.

Answer:

D. all of these