Patent ID: 6429404
Filing Date: 2002-08-06
Classification: B23K

Abstract:
A tracking monitoring device for a weld line, comprising:(A) welding current detecting means for detecting a welding current waveform obtained when a welding torch is oscillated in a groove width direction, in consumable electrode gas shield arc welding, a short-circuit period and arc period being repeated for groove welding; (B) short-circuiting current waveform removing means for removing a short-circuiting current waveform from the welding current wave form detected by said welding current detecting means, said short-circuiting current waveform being a welding current waveform in a short-circuit period; (C) interpolating means for linearly interpolating a missing part in the welding current waveform removed of the short-circuiting current waveform; (D) sampling means for sampling said linearly interpolated welding current waveform at a plurality of intervals corresponding to the oscillating frequency of the welding torch; (E) replacing means for replacing said sampled welding current waveforms by an approximated straight line by a least square method; and (F) excursion display means in an oscillation direction for displaying the positional excursion direction and positional excursion distance of the welding torch in the oscillating direction relative to a groove central position as a reference, said positional excursion direction and positional excursion distance corresponding to inclination direction and inclination angle of said approximated straight line.