Arc welding uses electrical energy to generate heat at the weld.

• A. False
• B. Sometimes
• C. Only for gas welding
• D. True

Answer: (D)

Arc welding utilizes electrical energy to generate the heat that melts the weld area. The power source sends current through the electrode and into the workpiece, creating an electric arc. That arc is a highly energetic, ionized channel that vaporizes and melts metal, forming the weld as the filler and base metal fuse together. The heat comes from the arc’s energy and the resistance of the metal, not from a flame or chemical reaction, and shielding gas protects the molten pool but doesn’t provide the heat. So the statement is true, since arc welding always relies on electrical energy to produce the weld heat rather than a flame or other non-electrical heat source.