Induction compensating method and apparatus for weld nugget resi

Details Induction compensating method and apparatus for weld nugget resi Induction compensating method and apparatus for weld nugget resi

1981-07-20

1983-09-06

Shaw, C. C.

Electric heating

Metal heating

For bonding with pressure

219110, B23K 1124

Patent

active

044031327

ABSTRACT:
In an electrical spot welding machine having sensor leads for monitoring weld nugget resistance connected to the electrodes or to the welding current conductors, the voltage component induced in the sensor leads due to inductive coupling is cancelled out by inducing a substantially equal and opposite compensating voltage in the sensor leads. For this purpose an inductance coil may be connected into one of the sensor leads and appropriately positioned on one of the welding current conductors. A core-less coil can be employed, and correct adjustment of the compensating voltage can be achieved by adjusting the coil angularly with respect to the axis of the welding current conductor.

REFERENCES:
patent: 2370009 (1945-02-01), Clark et al.
patent: 2486552 (1949-11-01), Callender

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