Circuit for measuring the voltage drop between the welding elect

Details Circuit for measuring the voltage drop between the welding elect Circuit for measuring the voltage drop between the welding elect

1989-05-25

1990-07-03

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

219 64, B23K 1125

Patent

active

049393359

ABSTRACT:
What is described is a circuit for measuring the effective voltage drop at the welding position (30) between the welding electrodes (14,16) of a resistance seam welding machine. A first measuring loop (40) for measuring a first loop voltage is secured to the lower welding arm (28) close to the lower welding electrode (16) and is in communication with the upper welding electrode (14) through a sliding contact (44). The second measuring loop (60) is taken close to the welding electrodes (14,16) through the head portion of the Z-rail (12). The conductor turns (42,62) of both measuring loops, which lead to an evaluation circuit (48), are twisted together. Thus the stray effects picked up in the two measuring loops are the same. The difference between the two loop voltages formed in the evaluation circuit (48) is the effective voltage drop which is further processed in the usual manner to monitor the quality of the welding seam produced.

REFERENCES:
patent: 4403132 (1983-09-01), Sugimoto
patent: 4449028 (1984-05-01), Buxton
patent: 4714816 (1987-12-01), Pazzaglia

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