Arc welding and arc plasma cutting machines having improved DC h

Details Arc welding and arc plasma cutting machines having improved DC h Arc welding and arc plasma cutting machines having improved DC h

1996-12-27

1998-12-22

Shaw, Clifford C.

Electric heating

Metal heating

By arc

B23K 9067

Patent

active

058522786

ABSTRACT:
An arc welding and arc plasma cutting machine having a dc high-voltage generator is provided. The dc high-voltage generator includes a first dc power source, a second dc power source, an one-way rectifier, and a voltage clamping circuit. The first dc power source applies a dc voltage through the one-way rectifier across an electrode and a work piece. The second dc power source is connected across the first dc power source and superimposes a dc voltage on the power produced by the first dc power source for developing an arc discharge across the electrode and the work piece. The voltage clamping circuit connected in parallel to the one-way rectifier to restrict a high-voltage applied to the one-way rectifier below a given level for protecting the one-way rectifier from breakage due to application of the high-voltage.

REFERENCES:
patent: 2969494 (1961-01-01), Davis
patent: 4459629 (1984-07-01), Titus
patent: 4618760 (1986-10-01), Murch et al.
patent: 4950864 (1990-08-01), Campiotti et al.
patent: 5582751 (1996-12-01), Hagiwara et al.
patent: 5645741 (1997-07-01), Terayama et al.

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