Abstract
A field-shaper is a device that can significantly improve the efficiency of a magnetic pulse welding process. There is usually a seam to change the direction of the induced current in the field-shaper. However, this seam causes the electromagnetic force to be unevenly distributed in the circumferential direction, and it is difficult to weld near it. To improve the uniformity of magnetic pulse welding, a novel multi-seam field-shaper is investigated in this paper. Both numerical simulation and experimental study are carried out. The effects of the number of seams, the length of the seams, and the discharge voltage on the welding performance of a magnetic pulse tube are studied. In this work, when the number of seams in the field-shaper is four, and the length of the short seam is 16 mm, the field-shaper facilitates a uniform circumferential distribution of the electromagnetic force. The measurements and simulation of free tube-compression and tube-welding are performed using a multi-seam field-shaper. The results show that a magnetic pulse welding system with a multi-seam field-shaper can significantly improve the circular deformation uniformity of a 5052 aluminum-alloy tube.
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