Method and apparatus for resistance welding

Details Method and apparatus for resistance welding Method and apparatus for resistance welding

1986-07-09

1987-07-07

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

219110, B23K 1124

Patent

active

046788875

ABSTRACT:
A method and apparatus are disclosed for resistance spot welding including applying a preconditioning pulse at the beginning of a welding process to stabilize the resistances at the interface of the sheets being welded and at the interface of the electrodes and the sheets. A current pulse is applied just after contact of electrodes and the workpiece when the electrode force is between about 10% and 75% of its final value to melt interface surfaces followed by a cooling time to permit dissipation of heat from the interfaces, and is finally followed by a conventional weld current schedule. The contact time is determined be electrically monitoring the conductivity between the electrodes as they are moved toward the workpiece. Alternatively, the applied electrode pressure is monitored to determine when sufficient electrode force is applied to the workpiece to achieve the proper resistance for the pulse application.

REFERENCES:
patent: 4419560 (1983-12-01), Zurek
patent: 4447700 (1984-05-01), Cohen
patent: 4456810 (1984-06-01), Schumacher et al.
Schumacher et al, "Resistance Spot Welding Control that Automatically Selects the Welding Schedule for Different Types of Steel", SAE paper No. 850407, 1985.

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