Resistance welding control method

Details Resistance welding control method Resistance welding control method

2005-06-07

2005-06-07

Shaw, Clifford C. (Department: 1725)

Electric heating

Metal heating

For bonding with pressure

C219S086320

Reexamination Certificate

active

06903298

ABSTRACT:
This invention provides a method of producing a series of substantially uniform spot welds between two metal parts using a servomotor driven movable electrode and an axially opposing fixed electrode. Target values for electrode displacement in producing a weld indentation and electrode squeeze force are determined for the electrodes and workpieces. During welding operations electrode displacement and electrode force measurements are continually taken and compared with the displacement and force target values. While the measured values are within a tolerance range of the target values, welding is continued using the preset parameters. When either or both of the measured electrode displacement or force value falls outside the target range the total welding current is adjusted in small increments to correct the displacement and/or force values and, thereafter, welding is continued using the new total welding current.

REFERENCES:
patent: 4596917 (1986-06-01), Nied et al.
patent: 4734555 (1988-03-01), Ferguson
patent: 5063279 (1991-11-01), Rossi
patent: 5254828 (1993-10-01), Stiebel
patent: 5393950 (1995-02-01), Killian
patent: 5587091 (1996-12-01), Kawagoe et al.
patent: 6232572 (2001-05-01), Kanjo

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