Question

what current works best when the operator encounters magnetic arc blow?

dcep
acen
cc
ac

Explanation:

Understand magnetic arc blow

Magnetic arc blow is a phenomenon where the electric welding arc is deflected from its intended path due to electromagnetic forces. This occurs primarily when using direct current (DC) because the unidirectional current flow establishes a stable, concentrated magnetic field in the workpiece that can pull or push the arc.

Identify the solution using current types

Using the Alternating Current and Direct Current knowledge points

• DC (including DCEP) creates a continuous magnetic field that causes arc blow.
• AC (Alternating Current) constantly reverses its direction of current flow (and thus the magnetic field direction) at a high frequency. This rapid reversal prevents a stable, directional magnetic field from building up in the workpiece, effectively eliminating magnetic arc blow.

Select the correct option

Comparing the options:

• DCEP: Direct Current Electrode Positive (causes arc blow)
• ACEN: Alternating Current Electrode Negative (not a standard term; AC has no fixed polarity)
• CC: Constant Current (a power source characteristic, not a current type that solves arc blow)
• AC: Alternating Current (the correct choice)

Answer:

• (A) DCEP
• (B) ACEN
• (C) CC
• (D) AC (Correct answer)