All arc welding relies on transferring electrical energy to heat energy to join the electrode and base metal.

• A. True
• B. False
• C. Only some arc welding relies on this energy transfer
• D. Heat is not involved in welding

Answer: (A)

Arc welding relies on electric current passing through an arc to generate a very high heat source. That heat is what melts the electrode and the base metal, allowing them to fuse together and form a weld. Whether the electrode is consumable (providing filler metal) or nonconsumable (with filler added separately), the core mechanism is the electrical energy being transformed into heat at the arc, driving the melting and bonding process. Without that conversion to heat, no weld would form, which is why this statement is correct.