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Press welding

Joining process of two sheets by heat and pressure created by two conductive electrodes, at least one of the plates has one or more bulging portions.

Illustration of Press welding

The process

This method requires that one or both plates have at least one bump. The bulging portions may, for example, be curved in either the longitudinal direction or have a more circular design. Two plates are placed together first and then positioned between two water-cooled metal rods. Metal rods act as electrodes and are connected to an external power source. The electrodes are then pressed together with the plates and a current is passed through them.

The result is that the material is melted at the contact point [1] due to the large thermal energy generated by the current and pressure. Power is cut after a certain amount of heat energy is reached at the point of contact. After the plates have fused together, and after the weld has been partially cooled, the electrodes are removed from the plates and the bonding process is complete.