Pulsed arc welding apparatus
First Claim
1. A pulsed arc welding apparatus comprising:
- a voltage detector an arc voltage corresponding to a variation of an arc length produced between a welding electrode and workpieces,a current detector for detecting an arc current to be supplied to said welding electrode,an arc length detector for converting said detected arc current value into a reference arc voltage and for outputting an arc length signal, representing a momentary variation in the arc length as a pulsed welding process proceeds, based on comparison operations between said reference arc voltage and said detected arc voltage value, andmeans for performing said pulsed arc welding process based on said arc length signal.
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Abstract
A pulsed arc welding for carrying out arc welding or short-circuit transfer type arc welding by utilizing the pulsed discharge generated at the tip of a wire electrode. The propensity of wire electrode curvature causes irregular changes in the contact point of the wire electrode and variations in the arc length between the wire electrode tip and workpieces. Consequently, the invention detects arc voltage and current and checks the instantaneous variation in the arc length. The arc voltage value thus detected is converted to a reference arc voltage variable. Then the detected arc voltage value is compared with the reference value to compute a true arc length. A simulation arc length signal, which varies as welding proceeds, and a reference simulation welding current waveform are set, to compare the simulation arc length signal with the computed arc length signal. The reference simulation welding current waveform is corrected according to this difference signal to form and output a welding current waveform, which is controllable instantaneously to provide an ideal target arc length. Welding can be carried out with stability since the wire electrode is allowed to hold the simulation arc length during each welding process.
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Citations
35 Claims
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1. A pulsed arc welding apparatus comprising:
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a voltage detector an arc voltage corresponding to a variation of an arc length produced between a welding electrode and workpieces, a current detector for detecting an arc current to be supplied to said welding electrode, an arc length detector for converting said detected arc current value into a reference arc voltage and for outputting an arc length signal, representing a momentary variation in the arc length as a pulsed welding process proceeds, based on comparison operations between said reference arc voltage and said detected arc voltage value, and means for performing said pulsed arc welding process based on said arc length signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 31, 32, 33, 34, 35)
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30. A pulsed arc welding apparatus, according to clam 1, wherein said arc length detector further includes a first isolating amplifier for amplifying the arc voltage detected by said voltage detector,
a second isolation amplifier for amplifying the arc current detected by the current detector, and an arc voltage setting device for converting an output of said second isolating amplifier to a reference voltage.
Specification