What is cold welding, and how does a cold welding machine work?

The process of cold welding needs no heat input to join the metal workpieces together.
The metal is not molten at any stage and remains in a solid state.
Thus cold welding is labeled as a solid-state welding process.
The necessary energy to join the metal is applied in the shape of pressure.
Cold welding never has the metal in a molten state as compared to fusion welding or arc and friction welding.

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