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Electromagnetic welding belongs to the high energy rate welding as explosive welding does. It uses a pulsed electromagnetic pressure which is induced by a coil, and it can be treated more safely than explosive welding. This process is applicable to joining tubes of aluminum, copper and other metals of smaller diameters.The current source used by the authors is a capacitor bank of 500μF in capacitance and 10kV in proof voltage. A solenoidal coil made of a shielded copper wire of 1.2mm in diameter is suitable for this current source.Welding is performed either (1) by setting the coil outside the outer tube or (2) by setting it inside the inner tube. In the case (1), the joints of straight tube-straight core with certain clearance between them, straight tube-tapered core, and tapered tube-straight core can be used. In the case (2), the joint of tapered outer-tube-straight inner-tube will be suitable.Welded interface exhibits a wavy pattern which is typical with the case of high energy rate welding. Although some intermetallic compound exists at the interface, its quantity is smaller than those obtained by other solid state welding processes, and it will affect little on the service performance of the welded joint.
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