Exothermic welding, also known as exothermic bonding, thermite welding (TW), and thermit welding, is a welding process for joining materials 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 aluminium powder and a metal oxide.

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