Flash welding

Flash welding is a method that adopts similar principles to upset welding. This page introduces the differences between flash welding and upset welding in addition to those principles.

This method holds base materials with their joint ends lightly held together and then passes a current through the abutting surfaces. The materials are joined with the heat generated by electrical resistance (Joule heat). Unlike upset welding, pressure is not applied to the base materials when the current is passed. After the current is passed and the generated Joule heat heats the material to the joining temperature, pressure is applied to weld the materials.
Similar to upset welding, this method is suited for welding metal wires or rods.

Mechanism of upset welding/flash welding
Mechanism of upset welding/flash welding
  1. Pressure
  2. Electrode
  3. Joined section