Parallel Seam Welding of Aluminum Sheets by Magnetic Pulse Welding Method with Collision between Metal Jets

Abstract

This paper provides details about the adjacent parallel seam welding of a pair of aluminum sheets by a magnetic pulse welding (MPW) method. An impulse discharge current from a capacitor bank passes through a flat one-turn coil and concentrates on two parallel along the narrow middle parts of the coil. A magnetic flux is suddenly generated around the middle parts. This flux intersects the sheets which are overlapped on the middle parts. The resulting eddy currents are induced in the sheets, applying two parallel strong electromagnetic forces to them. The sheets having a gap collide with each other at high speed in two parallel. In this time, four metal jets occur just ahead of the collision front along the middle parts. Two metal jets occurring in the inside collide with each other if the experimental conditions are suitable.