Electric heating – Metal heating – By arc
Patent
1989-02-10
1990-01-30
Shaw, Clifford C.
Electric heating
Metal heating
By arc
21913021, B23K 909
Patent
active
048975230
ABSTRACT:
In a short circuiting arc welding apparatus and method wherein a continuously fed welding wire alternates between an arcing condition during which the wire is spaced from the molten pool of the workpiece and a short circuit condition during which the melted metal on the end of the welding wire is in contact with the molten metal pool and thereafter transfers to the workpiece by a necking action breaking the melted metal from the wire, there is provided an improvement including providing a first high inductance current control circuit for continuously directing a low level, arc sustaining, background current between the welding wire and the workpiece and providing a second current control circuit for controlling current flow during the arcing condition of the process. This second current control circuit includes time delay means for causing the initiating arc at the start of the arcing condition to have an area determined primarily by the background current for a preselected time during which the molten metal on the tip of the welding wire and in the molten metal pool are drawn, by surface tension, to the wire and pool respectively, is essentially quelled and means for then passing a high current pulse through the arc between the wire and pool with a preselected energy for melting a relatively constant volume of metal on the end of the wire and spaced from the pool. This high energy pulse is near the start of the arcing condition and terminates generally before the mid-point of the arcing condition so that the wire is first melted and then driven into the molten metal pool after the pool has essentially quelled or become quiescent.
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Parks John M.
Stava Elliott K.
Shaw Clifford C.
The Lincoln Electric Company
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