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Rapid oxidation (rust) occurs when oxygen, in the surrounding air, is allowed to reach the molten pool. Time does not factor into the equation. Most welding processes utilize a medium to protect the weld puddle until it solidifies. An inert gas ( ie: argon, helium, CO2) and or a liquid material perform this function. In some instances the heat burns off the oxygen. Once the puddle has solidified the oxidation process is slowed considerably. Any unprotected metal will oxidize (rust) except stainless and some nickle/copper alloys. Even aluminum oxidizes but only to a certain depth.

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Q: If the weld pool is cooled slowly it will rapidly oxidize?
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