Friction Stir Welding process for high power heat sink or liquid cold plate

Friction welding is to realize the solid-state welding approach. Under the effect of pressure and with the effects of constant or increase pressure and torque, the relative motion between the welding contacts generates the heat of friction and plastic deformation heat. This effect increases the temperature in the neighboring area to the temperature range which is slightly lower than the melting point. The material’s resistance to deformation is reduced and its plasticity is enhanced. As the oxide film on the interface is ruptured and with the effect of upsetting pressure, the material generates plastic deformation and begins to flow. The molecular diffusion and recrystallization therefore realize the solid-state welding approach.