RESISTANCE SPOT WELDING METHOD Russian patent published in 1997 - IPC

FIELD: mechanical engineering; resistance spot welding; control method. SUBSTANCE: method of resistance spot welding by means of multiple transformer welding machines consists in the following one pair of electrodes of each transformer is clamped together at each welding cycle in zones A, B, C. Each welding transformer T1, T2, T3 is connected to separate contactor C1, C2, C3 controlled by multimode welding cycle regulator. WCR1, WCR2, WCR3. Transformers are cut into operation in sequence. Turns of secondary windings of transformers are connected in parallel. Electrode pressure application time is set before welding of first spot and electrode pressure holding time, after welding of last in each cycle. Welding is carried out at individual mode. EFFECT: enlarged operating capabilities. 2 dwg