Arc welding energy conversion statement: In arc welding, electrical energy is converted to heat energy at the weld.

• A. False
• B. Only in some processes
• C. It is converted to light energy
• D. True

Answer: (D)

In arc welding the welding action relies on turning electrical energy into heat at the metal to melt and fuse it. The electric current flows through the arc, and the resistance and energy present in the arc plasma deliver intense heat right at the weld zone. This heat is what melts the base metal and any filler metal to form the weld bead. While some energy is emitted as light and other losses occur, the fundamental transformation at the weld is electrical energy becoming heat energy, which is why the statement is true.