Kobe Steel, Ltd.

Masahiro Honma

Kei Yamazaki

Eiji Sato

Keiichi Suzuki

Fusaki Koshiishi

Masahiro Yokota

A pulsed arc welding method using carbon dioxide gas alone or a mixed gas made mainly of carbon dioxide gas as a shield gas, provides a pulse current of alternately repeating first and second pulses as a weld current. The first pulse and the second pulse have a pulse waveform of a different pulse peak current level and a different pulse width, respectively, and the following conditions are satisfied: peak current of the first pulse (I1)=300 to 700 A; peak period (T1)=0.3 to 5.0 ms; base current I1=30 to 200 A, base period (T1)=0.3 to 10 ms; peak current of the second pulse (I2)=200 to 600 A; peak period (T2)=1.0 to 15 ms; base current (I2)=30 to 200 A; and base period (T2)=3.0 to 20 ms.

Pulsed arc welding method

A welding control apparatus includes an integrator for starting calculation of a voltage error integral value Svwhen a first pulse period ends and a second pulse period starts in a pulse cycle, based on various data. The apparatus also includes a comparator for comparatively determining whether a value of the voltage error integral value Svprovided as the calculation result has become 0, and a waveform generator for terminating the relevant pulse cycle and starting a next pulse cycle when the value of the voltage error integral value Svis 0. Where2=&#x222b;{(2&#x2212;2)+2&#x2212;2}&#x2003;&#x2003;(1).

Welding control apparatus for pulse arc welding of consumed electrode type, arc length control method for use with the same, and welding system including the welding control apparatus

A tandem pulse arc welding control apparatus includes a voltage detector; a voltage setting unit; a pulse-peak-current-reference-value setting circuit; a pulse-base-current-reference-value setting circuit; an error amplifier that calculates a pulse-peak-current variation value and a pulse-base-current variation value; an adder that calculates a pulse-peak-current value; an adder that calculates a pulse-base-current value; a pulse-waveform selection circuit that outputs the pulse-peak-current value in a pulse peak period, and that outputs the pulse-base-current value in a pulse base period; and an output control circuit that controls a current value for a second welding wire. Because an appropriate welding voltage can be obtained with this configuration, a high welding quality can be realized.

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Fujisawa, Japan

Masahiro Honma