MONITORING METHOD FOR PLASMA ARC WELDING AND PLASMA ARC WELDING DEVICE
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United States of America Patent
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Issued Date -
Oct 23, 2014
app pub date -
Nov 16, 2012
filing date -
Nov 17, 2011
priority date (Note) -
Abandoned
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Abstract
The method of monitoring keyhole welding with a plasma arc includes the step of measuring output voltages when welding is performed with a constant current, and the step of finding peak frequencies and distributions of welding voltages by analyzing frequencies of the welding voltages which correlate to a molten weld pool (P) vibration among the output voltages measured. The method also includes the step of identifying the peak frequencies that correlate to the molten weld pool (P) vibration, and the step of comparing the identified peak frequencies with a frequency range and determining whether the welding is good or bad. Thus, whether or not good keyhole welding is carried out can be determined with excellent precision by simply comparing the peak frequency that correlates to the molten weld pool (P) vibration with the frequency range.
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