Electric heating – Metal heating – By arc
Patent
1990-05-29
1991-01-08
Paschall, M. H.
Electric heating
Metal heating
By arc
21912154, 21912157, 2191301, 21912159, B23K 900
Patent
active
049838075
ABSTRACT:
In a plasma cutting apparatus for cutting a workpiece with a plasma arc, a cutting torch moves relative to the workpiece. The cutting torch produces plasma arc in accordance with a cutting current supplied thereto. To improve surface roughness of the cut facet of the workpiece, a pulsating current is superimposed on a D.C. current to provide the cutting current, wherein the frequency of the pulsating current is controlled in accordance with the moving speed of the cutting torch.
REFERENCES:
patent: 4493696 (1990-07-01), Thommes
Kohsaka Kunio
Yamada Osamu
Yamane Hisaaki
Brother Kogyo Kabushiki Kaisha
Paschall M. H.
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