Question

An advantage of an AC welding circuit is:

a) It is best used with large electrodes on thin materials
b) It is best used with small electrodes on thin sections
c) It helps to eliminate arc blow
d) It minimizes internal undercut

Answer 1

An advantage of an AC welding circuit is that it helps to eliminate arc blow, a factor that can cause defects in welding. This is due to AC's ability to change direction, countering magnetic field buildup that distorts the welding arc.

Step-by-step explanation:

An advantage of an AC welding circuit is that it helps to eliminate arc blow. Arc blow can cause welding defects and make it difficult to control the welding arc. The alternating current (AC) constantly changes direction, which helps to counteract any magnetic build-up that might deflect the arc. In contrast, direct current (DC) could sustain a magnetic field that contributes to arc blow in certain welding situations.

Regarding other options provided: Using large electrodes on thin materials or small electrodes on thin sections is not specifically an advantage of AC over DC welding circuits. These choices are more related to the electrode size and material thickness compatibility. Minimizing internal undercut is a function of welding technique and parameters rather than the type of current used.