Question

when smaw welding on carbon steel, what polarity is most commonly used?

acen
acep
dcen
dcep

Explanation:

Identify the welding process and material

Using the SMAW knowledge point
The question asks for the most common polarity used when performing Shielded Metal Arc Welding (SMAW), also known as stick welding, on carbon steel.

Analyze the polarity options

Using the Welding Polarity and DCEP knowledge points

• DCEP (Direct Current Electrode Positive, or reverse polarity) is the most common polarity for SMAW on carbon steel because it provides deep penetration, a stable arc, and excellent bead appearance with most standard electrodes (such as E6010 and E7018).
• DCEN (Direct Current Electrode Negative, or straight polarity) is used for faster deposition rates but offers shallower penetration.
• AC (Alternating Current) is typically used to prevent arc blow or when only AC power sources are available, but is not the primary choice. "ACEN" and "ACEP" are not standard industry terms.

Answer:

• (A) ACEN
• (B) ACEP
• (C) DCEN
• (D) DCEP (Correct answer)