Title:
MONITORING METHOD FOR PLASMA ARC WELDING AND PLASMA ARC WELDING DEVICE
Document Type and Number:
WIPO Patent Application WO/2013/073656
Kind Code:
A1
Abstract:
This method for monitoring keyhole welding by a plasma arc includes: a step for measuring output voltage when welding using a constant current; a step for finding a peak frequency and distribution of the same by frequency analysis of a welding voltage correlating with molten weld pool (P) vibration among the output voltages measured; a step for specifying the peak frequency that correlates with the molten weld pool (P) vibration; and a step for comparing the specified peak frequency with a frequency range and determining whether the weld is good or bad. Thus, whether or not excellent keyhole welding is carried out can be determined with excellent precision just by comparing the peak frequency that correlates with the molten weld pool (P) vibration and a frequency range.
Inventors:
HOSOYA KAZUMICHI (JP)
YAMAMOTO HIKARU (JP)
NAKAJIMA TORU (JP)
SATO TOYOYUKI (JP)
WADA KATSUNORI (JP)
KANEMARU SHUHEI (JP)
YAMAMOTO HIKARU (JP)
NAKAJIMA TORU (JP)
SATO TOYOYUKI (JP)
WADA KATSUNORI (JP)
KANEMARU SHUHEI (JP)
Application Number:
PCT/JP2012/079747
Publication Date:
May 23, 2013
Filing Date:
November 16, 2012
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACHINERY (JP)
International Classes:
B23K10/00; B23K10/02
Foreign References:
| JPH10235490A | 1998-09-08 | |||
| JPS63171266A | 1988-07-15 | |||
| JPH0839259A | 1996-02-13 |
Attorney, Agent or Firm:
TAKASAKI Yoshihiro et al. (JP)
Yoshihiro Takasaki (JP)
Yoshihiro Takasaki (JP)
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