Method and apparatus for welding with CV control

Details Method and apparatus for welding with CV control Method and apparatus for welding with CV control

2005-06-21

2005-06-21

Shaw, Clifford C. (Department: 1725)

Electric heating

Metal heating

By arc

C219S130210, C219S130310

Reexamination Certificate

active

06909067

ABSTRACT:
A method and apparatus for welding is disclosed. The output is preferably a cyclical CV MIG output, and each cycle is divided into segments. An output parameter is sampled a plurality of times within one or more of the segments. The CV output is controlled within the at least one segment in response to the sampling. The parameter is output power, a resistance of the load, an output current, an output voltage, or functions thereof in various embodiments. The control loop is preferably a PI or PID loop. The loop may be applied only within a window. The set point may be taught or fixed. The system can be used to weld with a controlled arc length.

REFERENCES:
patent: 3912980 (1975-10-01), Crump et al.
patent: 4595820 (1986-06-01), Richardson
patent: 4631385 (1986-12-01), Rothermel
patent: 4665299 (1987-05-01), Iwata et al.
patent: 4758707 (1988-07-01), Ogilvie et al.
patent: 6248976 (2001-06-01), Blankenship
patent: 6329636 (2001-12-01), Geissler
patent: 6441342 (2002-08-01), Hsu

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