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Overlay is used to put a layer/coating of metal on another metal. It can be a wear resistant material ( hard-facing plow edges, backhoe buckets and teeth, dozer blade edges etc.). Or a material to protect the base metal from corrosion or chemicals ( control valve surfaces). It can be used to layer a cheaper metal with a more expensive metal to save money ( ie: making something from steel and covering part or all of it with stainless steel). I have applied overlay with stick welding, TIG welding, Oxy-acetylene welding and MIG welding on a variety of objects and have seen it applied with submerged arc welding.

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