Welding of glassy metallic materials

Details Welding of glassy metallic materials Welding of glassy metallic materials

B - Operations, Transporting

23

K

327/109

B23K 11/16 (2006.01) C21D 9/50 (2006.01)

Patent

CA 1071716

INVENTION: WELDING OF GLASSY METALLIC MATERIALS INVENTORS: SHELDON KAVESH and GERALD R. BRETTS Abstract of the Invention A process is provided for welding metal bodies together, at least one of the metal bodies comprising a metallic material that is at least 50% glassy. The process comprises (a) clamping overlapped portions of the bodies between electrodes and applying a clamping force to the overlapped portions; (b) passing an electri- cal current having a rapid decay such that at least about 90% of the energy is delivered in less than about 4 x 10-3 sec through the bodies to melt at least a portion of one of the bodies, and (c) extracting heat from the bodies through the electrodes at a rate of at least about 105°C/sec by employing high conductivity electrodes having a thermal conductivity of at least about 0.30 cal/sec/cm2/°C to form a weld nugget joining the bodies. The weld nugget so formed has a shear strength which is at least 25% of the tensile strength of the body having the lowest tensile strength.

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