METHOD FOR STABILIZING SPOT WELDING

PURPOSE:To stably manufacture products with high welding quality by pressurizing a flat wire and a connector terminal with a certain load using a holding plate in performing spot welding of the flat wire and the connector terminal. CONSTITUTION:A conductor provided at the end portion of a flat wire 2 comprising a plurality of straight lines of solder plating copper of thickness 0.14mm and width l.5mm laminated at predetermined pitches from above and below by a combined tape of polyester and PVC is exposed at one side by 5mm. The conductor is held from above and below by a terminal 1 comprising a nickel-plated bed plated with gold on phosphor bronze of thickness 0.4mm and is exerted with a fixed load of 4kg by a holding plate 3 of brass and a preheating current of 0.5KA is made to flow through the conductor six times by a period of 0.02 second using flat end face tungsten electrodes 4, 5 arranged within 1.5mm, so as to melt an insulation cover 9 and then a welding current of 1.5KA is passed by about 0.02 second. Similar work is performed thousand times whereby good spot welding can be made any time.