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Thermic welding, also known as exothermic bonding, thermite welding and thermite welding, is a welding that employs molten metal to permanently join the conductors. The process employs an exothermic reaction of a thermite composition to heat the metal, and requires no external source of heat or current.

The chemical reaction that produces the heat is an aluminothermic reaction between aluminum powder and a metal oxide. Exothermic welding is usually used for welding copper conductors but is suitable for welding a wide range of metals, including stainless steel, cast iron, common steel, brass, bronze, and Monel.