Which of the following is an advantage of an AC transformer?

• A. Low Cost and No Arc Blow
• B. High Heat Output
• C. Requires DC Input
• D. Increases Arc Blow

Answer: (A)

AC transformer welders are valued for low cost and reduced arc blow. The essential idea is that the current reverses polarity with every cycle, so the magnetic field around the arc doesn’t build up in one direction. That constant reversal helps keep the arc centered and minimizes arc blow. At the same time, the transformer-based design is simple and rugged, which keeps production and maintenance costs down. The other statements don’t fit because this setup runs on AC, not DC input, and isn’t primarily praised for high heat output or for increasing arc blow.