page_title: Exothermic welding
hierarchical_section_title: Exothermic welding
caption_attribution_description: Thermite reaction proceeding. Shortly after this, the liquid iron flows into the mold around the rail gap.
context_page_description: Exothermic welding, also known as exothermic bonding, thermite welding, and thermit welding, is a welding process 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.
context_section_description: Exothermic welding, also known as exothermic bonding, thermite welding (TW), and thermit welding, is a welding process 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.
caption: A thermite weld in progress.
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