How does one weld with thermite?
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In the process the thermite, contained in a crucible, is ignited, e.g., by a strip of burning magnesium ribbon. The aluminum reduces the iron oxide to molten iron and forms a slag of aluminum oxide on its surface. The reaction is very exothermic; temperatures above 2,500°C (4,500°F) are often reached. Typically, the molten iron is poured into the joint to be welded, providing both heat for fusion and filler metal.
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