Method and apparatus for stopping welding process

Details Method and apparatus for stopping welding process Method and apparatus for stopping welding process

1998-02-17

2000-02-08

Shaw, Clifford C.

Electric heating

Metal heating

By arc

21913021, 2191305, B23K 9095

Patent

active

060230460

ABSTRACT:
A method and apparatus for stopping a welding process includes monitoring the status of the arc. The output current is commanded to a level sufficient to clear a short if a short circuit forms when the process is stopping. A low current level is commanded after the short has cleared. The low current level is sufficiently low to prevent the forming of a large ball. This is repeated until a short does not form. The wire feed speed is monitored, and the stopping process begins when the wire feed speed drops below a threshold. The stopping process is performed with, a MIG process, a pulsed spray process, and a short circuit transfer welding process. The arc voltage is monitored to determine the status of the arc. The motor is commanded to stop in response to receiving a user provided stop command, and the braking of the motor is controlled. At least one output parameter may be reduced before the threshold is reached, but after receiving the stop signal in another alternative embodiment.

REFERENCES:
patent: 3689734 (1972-09-01), Burley et al.
patent: 4443687 (1984-04-01), Toth
patent: 4697062 (1987-09-01), Awano et al.
patent: 5412175 (1995-05-01), Shimogama

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