High frequency welding apparatus

Details High frequency welding apparatus High frequency welding apparatus

1981-12-16

1984-06-05

Shaw, C. C.

Electric heating

Metal heating

By arc

363 37, B23K 910

Patent

active

044530730

ABSTRACT:
Welding apparatus and a method of producing source of welding current. Use is made of an inverter supplied with direct current from a source to pulse a center-tapped primary winding of a transformer at a frequency in excess of the audio range of frequencies, typically 10 KHz to 20 KHz. A secondary winding of the transformer has output terminals for electrical connection to an electrode and work to be welded. The operation of the inverter is controlled by means of a feedback signal derived from a winding inductively coupled to the transformer.
The high operating frequency results in a significant reduction in the mass and dimensions of the welder compared to conventional welders which operate at mains frequencies.

REFERENCES:
patent: 3728516 (1973-04-01), Daspit
patent: 3973165 (1976-08-01), Hester
patent: 4004209 (1977-01-01), Lawson, Jr.
patent: 4048468 (1977-09-01), Maule
patent: 4061930 (1977-12-01), Nerem
patent: 4159409 (1979-06-01), Hedberg
patent: 4201906 (1980-05-01), Puschner

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