Engine driven arc welder

Details Engine driven arc welder Engine driven arc welder

1994-10-17

1997-06-10

Shaw, Clifford C.

Electric heating

Metal heating

By arc

219133, B23K 910

Patent

active

056372469

ABSTRACT:
There is provided an engine driven arc welder adapted for converting a.c. output of welding generator into d.c. output to allow it to undergo switching control by using a switching circuit to detect an output of the switching circuit to control its ON/OFF period by the detected content to control a welding current. This engine driven arc welder further has a reference signal formation circuit for forming a reference signal such that when a detected voltage across welding terminals is higher than a first predetermined value, it has a first reference value. When the detected voltage is lower than a second predetermined value, the reference signal has a second reference value higher than the first reference value, and when the detected voltage is between the first and second predetermined values, the reference signal has a reference value of drooping characteristic continuously connecting first and second reference values, thus to compare a detected signal at the welding terminal with the reference signal of the reference signal formation circuit to control the switching circuit.

REFERENCES:
patent: 2458658 (1949-01-01), Tyrner
patent: 4952774 (1990-08-01), Sugimoto et al.
patent: 5093611 (1992-03-01), Nakamura et al.
patent: 5250786 (1993-10-01), Kikuchi et al.

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