Which statement describes energy transformation in arc welding?

• A. Electrical energy is converted to heat energy in the weld zone
• B. Mechanical energy is converted to magnetic energy
• C. Chemical energy is converted to electrical energy
• D. Light energy is converted to gravitational energy

Answer: (A)

In arc welding, the energy from the power source is electrical and is concentrated in the arc to produce extremely high temperatures. This makes electrical energy primarily transform into heat energy in the weld zone, melting the base metal (and filler, if used) to form the weld. The heat driving melting is the key process, so the overall energy path is electrical energy → heat energy at the weld pool. Other options describe energy conversions that don’t capture what mainly happens in arc welding (such as mechanical to magnetic, chemical to electrical, or light to gravitational energy). The fundamental transformation you’re looking for is electrical energy becoming heat energy in the weld area.