You are here

Magnetic Pulse Welding, MPW

Joining process by the generation of magnetic pulses.

Illustration of Magnetic Pulse Welding, MPW

The process

A single workpiece [1] is placed in a fixture in the machine and is then surrounded by an outer workpiece [2]. Typically, the workpieces have a circular shape.

The outer workpiece is then locked in place to prevent radial and axial movement. A large alternating current of up to one million amps is turned on and after it has passed a conductive coil [3] creates a strong magnetic field that makes the outer workpiece to accelerate greatly toward the interior. The outer workpiece can reach a speed of up to 800m/s and the phenomenon utilizes Lorentz force. When the workpieces collide a weld is made between them, thanks to the large kinetic energy and heat created.