B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
327/50
B23K 9/06 (2006.01) B23K 9/067 (2006.01) B23K 9/073 (2006.01)
Patent
CA 1037568
METAL INERT GAS ARC WELDING STARTING SYSTEM ABSTRACT A starting system for establishing an inert gas shielded arc between a consumable wire electrode and a workpiece from a constant current power supply including means for adjustably feeding the consumable wire electrode toward the workpiece in response to control signals generated by a control circuit. The control circuit includes a charging circuit which may consist of a capacitor and resistor and which is enabled by a voltage sensitive relay connected across the electrode and the workpiece. The charging circuit is adapted to produce an output signal when enabled by the relay which is fed in turn to a voltage divider for providing a first speed control signal. The electrode is advanced toward the workpiece at an initial speed determined by this signal. When the electrode makes contact: with the workpiece, the relay disables the charging circuit and the output signal is discharged over a predetermined time period. This period is sufficient to hold the electrode at its initial speed so that the arc can be readily established. A weld speed control circuit including a variable potentiometer is then enabled for providing a second speed control signal. The welding operation is then carried out at a final speed determined by this later signal. S P E C I F I C A T I O N -1-
230021
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