Which of the following is a type of ERW?

Which of the following is a type of ERW?

• A. Spot welding
• B. Shielded Metal Arc Welding
• C. Gas Tungsten Arc Welding
• D. Flux-Cored Arc Welding

Answer: (A)

Spot welding is a type of Electric Resistance Weld (ERW) because the heat to fuse the metal comes from electrical resistance at the contact area between two sheets pressed together by electrodes. In this process, a high current flows through the sheets and the electrode force completes the circuit, melting just the interface to form a weld nugget without adding filler metal. This localized heating and pressure contrast with arc welding methods like SMAW, GTAW, and FCAW, which rely on an electric arc (and typically use filler metal). So the spot-welded joint is produced by resistance heating, making it an ERW.

Spot welding is a type of Electric Resistance Weld (ERW) because the heat to fuse the metal comes from electrical resistance at the contact area between two sheets pressed together by electrodes. In this process, a high current flows through the sheets and the electrode force completes the circuit, melting just the interface to form a weld nugget without adding filler metal. This localized heating and pressure contrast with arc welding methods like SMAW, GTAW, and FCAW, which rely on an electric arc (and typically use filler metal). So the spot-welded joint is produced by resistance heating, making it an ERW.