Factors Affecting the Result of Electromagnetic Welding of Aluminum Tube : Study on Electromagnetic Welding, Report 2

概要

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The important factors which affect the result of electromagnetic welding will be i) inductance of coil, ii) clearance between outer tube and core bar, iii) tapered angle of core bar, iv) thickness of the core when a tubular core is used, and v) hardness of outer tube. Each of those factors was examined on some joints made of industrial pure aluminum. The main part of the welding equipment was a capacitor with capacitance of 1, 000 μF and proof voltage of 5 kV. The result of welding was expressed by the ratio of welded length to interfacial length along the circumference. The results could be summarized as follows : (1) The optimum result of welding was obtained with a coil inductance of about 3 μH. (2) The most suitable clearance was 3 mm. (3) For the joint of straight core, two welded zones were obtained near the ends of the coil. They moved toward the center of the coil as the tapered angle increased up to 8 degrees. (4) Welding was feasible for a tubular core, when its thickness exceeded about 6 mm. (5) The softer the outer tube, the more easily the welding was performed, if the energy input was constant.
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1988-04-01