GB930941A - Improvements relating to the resistance welding of metal parts - Google Patents

Abstract

930,941. Making electric cables; welding by pressure. AMERICAN MACHINE & FOUNDRY CO. June 14, 1961, No. 21529/61. Classes 83 (2) and 83 (4). In resistance welding opposed surfaces on two metal flanges upstanding from adjacent edges on two metal parts, the flanges are continuously advanced side by side to converge and meet at a weld point where the flanges are squeezed together and the opposed surfaces are heated progressively by applying to the flanges in advance of the weld point an alternating current of such frequency that it is concentrated in the nearest regions of the opposed surfaces to resistance heat these regions to welding temperature. In sheathing a cable 10, Fig. 1, a metal sheath 11, provided with flanges 12, 14 at 90 degrees to the tangent plane at the flange base and spaced apart in a V gap, is advanced with the cable by feed rolls (not shown) while the inner surfaces 12a, 14a of the flanges are heated to reach welding temperature at the apex point w by current of 100 kilocycles or more applied by electrodes 15, 16 engaging the flanges in advance of the point w. At the point w the flanges are squeezed by rollers 17, 19 and the upper portion of the welded flanges is removed by a scarfing tool 20. Alternatively, the welded flanges may be folded down against the sheath. In a modification the flanges 22, 23, Fig. 5, diverge, the electrodes 15, 16 are applied to the inner surfaces of the flanges and the squeeze rolls 24, 25 have bevelled surfaces 26, 27 engaging under the exterior surfaces of the flanges. The welded flanges may be scarfed or mashed down in opposite directions on the tube. Blocks of magnetic material may be placed adjacent the flanges in advance of the weld point to retain the high-frequency current close to the inner surfaces of the flanges. Flat parts provided with flanges may be welded by the method described.