Method and apparatus for welding and control thereof

Details Method and apparatus for welding and control thereof Method and apparatus for welding and control thereof

2008-01-29

2008-01-29

Shaw, Clifford C. (Department: 1725)

Electric heating

Metal heating

By arc

C219S137710

Reexamination Certificate

active

07323658

ABSTRACT:
A method and apparatus for welding includes one or more of a welding type power source, a feedback circuit, a wire feeder and a controller. The controller preferably has an eta control circuit responsive to the feedback. It also has a control loop having a response time responsive to the eta output. The controller detects whether or not the process is a fast-tack process, and controls the supply of power according to a first control scheme is the process is a fast-tack process, and according to a second control scheme if the process is not a fast-tack process. The controller sets the run-in wire feed speed as a percentage of weld wire feed speed, preferably obtaining the percentage from the weld wire feed speed potentiometer at start up. The controller enters a calibration mode at start up if a calibration pendant is attached and on. In the calibration mode calibration receiving values from the front panel potentiometers.

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Millermatic® 250 Owner's Manual, Mar. 1998.
Millermatic® 250MP Miller The Power of Blue Owner's Manual, Jan. 1997.
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