Electric heating – Metal heating – By arc
Patent
1989-05-30
1990-08-07
Shaw, Clifford C.
Electric heating
Metal heating
By arc
219137PS, B23K 909
Patent
active
049470213
ABSTRACT:
A method and apparatus for TIG welding by passing an alternating current between a non-consumable electrode and a workpiece to form an arc, which apparatus comprises a single reactor with first and second coil portions and a common core, passing a direct current from a direct current power supply through the first coil portion of the reactor and in a negative direction from the workpiece to the electrode for creating a heating cycle, switchably disconnecting the direct current power supply from the circuit and immediately connecting the second coil portion of the reactor in a positive direction across the electrode and workpiece for creating a short cleaning cycle for cleaning the workpiece preparatory to the next heating cycle. These heating and cleaning cycles are continued to create a TIG welding process. During the negative current flow, energy and/or current to the arc is controlled by pulsing a FET switch with a pulse width modulated device adjusted by an error signal created by comparing the sensed arc current and a reference signal or set point.
REFERENCES:
patent: 3382345 (1968-05-01), Normando
patent: 3728515 (1973-04-01), Gedgaudas
patent: 4742208 (1988-05-01), Overman
Shaw Clifford C.
The Lincoln Electric Company
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