GB1136400A - Improved method for resistance welding and apparatus therefor - Google Patents

Abstract

1,136,400. Welding by pressure; making containers. MIDDLETON WELDERS Ltd. 28 Dec., 1966 [24 Dec., 1965], No. 54836/65. Headings B3A and B3R. In resistance welding spaced sheets A, A<SP>1</SP> to the flanges of channel shaped spacers B, the flanges are forced apart by a device C into contact with the sheets A, A<SP>1</SP> which are held at the correct spacing by anvils D during welding. The device C is a three part electrically conductive device expanded by a wedging action produced by movement of the centre part by a cam, toggle, screw or fluid pressure. The anvils D are part of a welding jig. Electrodes d<SP>2</SP>, d<SP>3</SP>, Fig. 3, act through apertures in the anvils to effect spot welding. The welds may be effected independently in which case the return welding leads are connected to the outer parts of the device C or in pairs in which case the device C merely conducts current between the flanges. One electrode d<SP>6</SP>, Fig. 5, may be constituted by an insulated part of the anvil D. In a modification for welding concentric cylindrical sheets to flanged annular spacers, the electrodes d<SP>8</SP>. Figs. 7 and 8, are mounted in apertures d<SP>4</SP> in inner and outer annular anvils. To effect welding, wheels d<SP>9</SP> are moved round the anvils D to apply welding pressure to the electrodes d<SP>8</SP>. Springs return the electrodes. Welding current is connected through the wheels d<SP>9</SP> to the electrodes d<SP>8</SP>.