Electric heating – Metal heating – By arc
Patent
1997-06-16
2000-07-11
Shaw, Clifford C.
Electric heating
Metal heating
By arc
2191304, B23K 9067
Patent
active
06087628&
ABSTRACT:
A welding machine that includes a power supply having at least one control input is described. The power supply is capable of providing an electrode positive and an electrode negative output. Also, the magnitude and balance of the output is controllable. The machine includes a controller that controls the power supply. If the user selects an electrode negative output the controller causes the output to be electrode positive at at least a first magnitude for a predetermined period of time at the start of the welding process. Then, the controller causes the output to be electrode negative at a magnitude equal to or greater than a second magnitude. Thereafter, the controller causes the output to be a user selected magnitude. If the user selects an ac mode, the electrode positive portion of the output is not constantly responsive to at least one of the user selected frequency and the user selected balance.
REFERENCES:
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patent: 3781508 (1973-12-01), Dauer et al.
patent: 4092517 (1978-05-01), Woodacre
patent: 4876433 (1989-10-01), Kashima et al.
patent: 5365035 (1994-11-01), Poulsen et al.
patent: 5444356 (1995-08-01), Reynolds et al.
Ferkel Stephen
Geissler Steven
Corrigan George R.
Illinois Tool Works Inc.
Shaw Clifford C.
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