Daihen Corporation

Osaka Transformer Co., Ltd.

Hideyuki Yamamoto

Katsuya Kugai

Toshiyuki Okada

Yusuke Niimura

Yuusuke Niimura

Michiya Kiyohara

Waichi Nishikawa

Moritoshi Nagasaka

There is disclosed a control apparatus and a control method in a welding apparatus for enabling a welding torch to trace a weld line with use of an oscillating process. In the control apparatus and control method, the welding torch is oscillated in the left and right directions crossing the weld line with an overpass, and an electric signal is detected responsive to changes in an arc length and a wire extension. The moving average value of the electric signal is calculated for a predetermined smoothing time interval so as to eliminate a high frequency noise component of the electric signal, and there is outputted a low-pass-filtered electric signal having a level of the calculated moving average value. Thereafter, a controller moves the center of the oscillation so as to enable the welding torch to trace the weld line responsive to the filtered electric signal.

Control apparatus for tracing a weld line in a welding apparatus and

A control method in a welding apparatus for enabling a welding torch to trace a weld line with use of an oscillating process is disclosed. The welding torch is oscillated in left and right directions solidly crossing the weld line. Electric signals respectively detected when the welding torch moves in the left and right directions for a time interval of the right half of the oscillation are compared with each other so as to generate a first comparative signal, and electric signals detected similarly for a time interval of the left half thereof are compared with each other so as to generate a second comparative signal. The center of the oscillation is moved in such a direction that a difference between the first and second comparative signals becomes small.

Control method for tracing a weld line in a welding apparatus

A pulse arc welding device includes a power source which produces a background current and pulse current imposed on it. A voltage drop across the arc is measured and when such a voltage drop deviates from a predetermined level, either one of background current, frequency of the pulse current and pulse duration of the pulse current is controlled to maintain the voltage drop across the arc constant.

Pulse arc welding method and device in which pulse current and

A method and apparatus for controlling the welding current in shortcircuit transfer arc welding including a method and control apparatus for maintaining the effective value of the welding current during arcing period at a predetermined value. Maintenance of the effective value of welding current during arcing period is necessary to keep the size of a fusion zone and the depth of penetration constant throughout welding operation.

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Kobe, Japan

Hideyuki Yamamoto