Title: Cold welding - Wikipedia
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Cold welding
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Content: Cold welding - Wikipedia
Cold welding
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Solid-state welding process

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Not to be confused with Cold fusion. Cross-section of cold welding – before and after the weld
Cold welding or contact welding is a solid -state welding process in which joining takes place without fusion or heating at the interface of the two parts to be welded. Unlike in the fusion-welding processes, no liquid or molten phase is present in the joint. Cold welding was first recognized as a general materials phenomenon in the 1940s. It was then discovered that two clean, flat surfaces of similar metal would strongly adhere if brought into contact while in a vacuum. Newly discovered micro- and nano-scale cold welding has shown potential in nanofabrication processes.