Hot crimping of cable shoes is a metal joining technology that uses electrical current and mechanical pressure to connect electrical conductive wires. Hot crimping is a type of resistance welding. Hot crimping differs from other types of resistance welding because it uses a conductive metal sleeve to pass the current, generate the heat and hold the wires together. This sleeve fuses the wires and makes one compacted metal part. The sleeve can be a cable shoe, a terminal or a simple round sleeve.
The joint is formed using a process that is called diffusion welding. Diffusion welding means the copper is joined because the copper wires and the copper connector fuse together at near-to-melt temperature. The material stays in solid phase and never enters the liquid phase.