Resistance spot welding control device and method

Details Resistance spot welding control device and method Resistance spot welding control device and method

2005-06-14

2005-06-14

Shaw, Clifford C. (Department: 1725)

Electric heating

Metal heating

For bonding with pressure

C219S110000

Reexamination Certificate

active

06906276

ABSTRACT:
The invention relates to a control device for spot welding with a welding electrode pincer (Z), the welding electrodes (E1, E2) of which are connect to a welding current generator (IS) and an electric motor drive (M), with a rotary transducer (RES), the signal of which is used by a control device (MP) to control the welding electrode pincer (Z). The closed state of said pincer holds the objects for welding (B1, B2) together, by means of a pre-set motor current (MAI), whereupon the welding current generator (IS) is activated. The control device (MP) comprises monitoring devices (const, max), to which the rotary transducer signals (RES) and/or a motor current measured signal (I(t)) are constantly supplied. Once a quasi-constant state is recognized, following a close signal for the welding electrode pincer (Z), a corresponding first state is recorded as the closed state and the welding current generator (IS) activated. Thereafter, as soon as the exceeding of a maximum value is reported, a further closed state is recorded, the welding current generator (IS) deactivated and a holding timer unit (CTT) activated, after the expiration (end) of which the on- and off-control of the welding electrode pincers is activated again.

REFERENCES:
patent: 3553420 (1971-01-01), Shearer et al.
patent: 4441006 (1984-04-01), Machida et al.
patent: 5483035 (1996-01-01), Kawai et al.
patent: 199 17 896 (1999-10-01), None
patent: 0 352 154 (1990-01-01), None
patent: 0 813 928 (1997-12-01), None

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