B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
327/70
B23K 9/06 (2006.01) B23K 9/073 (2006.01)
Patent
CA 1073534
A CURRENT UNIT FOR ARC WELDING An a.c. operated arc welding current supply unit comprises a frequency converter operating with a half period which is substantially less than the average duration of the current and voltage transients caused by short circuits through droplets of weld material during welding. The frequency converter is con- nected to welding electrodes through a transformer in series with a rectifier to provide direct current for the welding elec- trodes, and the frequency converter is associated with a control device for controlling said converter is associated with a control are power is maintained substantially unchanged irrespective of changes in load caused by the welding operation.
277675
Na
Thermal Dynamics Corporation
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