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Patent Searching and Data


Title:
ARC WELDING UNIT
Document Type and Number:
Japanese Patent JP3368777
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To suppress the generation of a high frequency noise, and to lower the breakdown strength of a current limiting element by applying an output from a DC high voltage circuit and an output from a high voltage pulse generating circuit to the output of the arc welding unit at the output terminal of an arc welding circuit at the time of a start, and stopping the output from the DC high voltage circuit and the output from the high voltage pulse generating circuit by the signal of a current detecting circuit detecting the presence of the absence of a welding current.
SOLUTION: A no-load voltage from the DC high voltage circuit 4 must be not less than 100V and not more 1000V. A single high voltage pulse with a peak value of not less than 1000V is generated by the high voltage pulse generating circuit 9. The output from the DC high voltage circuit 4 is superimposed in parallel with an output terminal between a non-consumable electrode 7 and a base material 8 for welding, and the single high voltage pulse from the high voltage pulse generating circuit 9 is superimposed in series to the output terminal by a transformer 10 for coupling. And, a welding current flowing from a current control element 2, is detected by the current detecting circuit 11, and the output from the DC high voltage circuit 4 and the output from the high voltage pulse generating circuit 9 are stopped.


Inventors:
Yasuhara, Yoshimichi
Application Number:
JP1996000329338
Publication Date:
January 20, 2003
Filing Date:
December 10, 1996
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
B23K9/167; B23K9/067; H02M9/00; (IPC1-7): B23K9/067; B23K9/167; H02M9/00
Attorney, Agent or Firm:
岩橋 文雄 (外2名)