Central Motor Wheel Co., Ltd.

Kawasaki Jukogyo Kabushiki Kaisha

Hirose Technology Co., Ltd.

Yukimitsu Suzuki

Kazuhiko Onoue

Ichiro Arita

Hirotaka Uehara

Satoru Yamasumi

Tadao Shimada

Masaru Seto

Sadao Kubo

Kunio Uchikoshi

Hirotaka Kinoshita

Koji Onishi

Katsunori Miyazaki

Takahisa Iizuka

Taro Kamiya

To provide an arc start method in a consumable electrode type arc welding method capable of firmly executing arc start and capable of executing high quality high speed welding by restraining a welding defect from being brought about therefor, at a portion of a wire projected from a welding tip, a temperature of a front end portion of the wire is made to be at a temperature higher than a temperature of a portion thereof near the welding tip. The front end portion of the wire is preheated to 300&#xb0; C. or higher, preferably, 450&#xb0; C. or higher. The front end portion of the wire is preheated by generating arc for preheating. The preheating arc is generated in a spot-like shape at a position near a terminal end portion of a predetermined welding line by constituting a current lower than a welding current.

Arc start method in consumable electrode type arc welding method

A method of measuring a welding-groove position for an over-lapped fillet welding of thin members, comprising a projection step of projecting a slit light so that the slit light is projected on both the thin members crossing a welding-groove face, a two-dimensional image acquisition step of capturing the slit-light image projected on each of the thin members as two-dimensional images; a three-dimensional conversion step of converting the two-dimensional images into three-dimensional images using a predetermined three-dimensional conversion parameter, and a calculation step of calculating the welding-groove position based on the three-dimensional data of the projected slit-light images, and relative positions between the projected slit-light images in the three-dimensional data defined by shapes and arrangement of the thin members.

Method, apparatus and system for measuring a welding-groove position

An arc welding quality evaluation apparatus for consumable electrode gas shielded arc welding comprises a heat input detection means for detecting heat input applied to a workpiece to be welded; a welding time detection means for detecting the welding time of the workpiece; a spatter weight detection means for detecting the weight of spatter produced during the welding time of the workpiece; a heat compensation means for compensating for heat loss due to spatter occurring during the welding time of the workpiece; an effective heat input computation means for computing effective heat input per unit welding time, based on detected values of the detection means and , and a compensation value of the heat compensation means ; and a weld quality assessment means for comparing an output of the effective heat input computation means to a reference standard value, and assessing weld quality acceptability based on the degree of separation of the computation means output from the reference standard value.

Arc welding quality evaluation apparatus

Welding voltage and welding current supplied to a workpiece from a welding wire of a consumable electrode gas shielded arc welding apparatus are detected by a welding voltage detection means and a welding current detection means A replacement index for an electrode tip is computed by a replacement index computation means based on the average values of the welding voltage and welding current during arc time. A wear assessment means assesses the state of wear of the electrode tip by comparing the replacement index to a prescribed reference value. When the electrode tipreaches its prescribed wear limit (when its replacement index reaches the prescribed reference value), this fact is indicated by a replace tip indicator means

Apparatus and method for assessing electrode tip wear

The present invention relates to an apparatus for assessing start-of-weld and steady state welding stability in pulsed arc consumable electrode gas-shielded welding. According to the present welding stability assessment apparatus, in order to obtain a pass/fail decision on start-of-weld welding stability for pulsed arc welding, an irregularity value is computed by a computer means, based on detected values from a detector means; and a pass/fail decision is made by an assessment means, thus making it possible to perform accurate assessment of start-of-weld welding stability in pulsed-arc welding.

Welding stability assessment apparatus for pulsed arc welding

A tracking monitoring device and a tracking control device are provided for determining the state of how a weld line is tracked under arc sensing control to let the oscillating center of a welding torch track a correct weld line along the groove center based on a welding current waveform when the welding torch is oscillated in the direction of the groove width, and for controlling an arc welding process. The tracking monitoring device and the tracking control device can form a weld line less affected by a short-circuit mode or sputtering mode which serves as a disturbance factor in a welding current value and are capable of coping with a welding speed increase in association with higher speed oscillating frequency.

Method and apparatus for determining seam tracking control of arc welding

A method and apparatus for determining the stability of arc welding between a base metal and a welding electrode. A welding current for the arc period and a welding current for the short-circuit period fed from a welding power source are sampled every cycle of the repetition of arc and short-circuit, in accordance with a predetermined sampling frequency. The welding current for the arc period is integrated, and a standard deviation of the integrated welding current for the arc period is calculated. The standard deviation of the integrated welding current for the short-circuit period is calculated, as well. These standard deviations are multiplied together to produce a product, so that a welding stability parameter is calculated on the basis of the product. Then, the welding stability parameter is compared with a predetermined reference value. In response to the result of comparison, the welding stability between the base metal and the welding electrode is determined. A time ratio of the arc period and the short-circuit period may be calculated every cycle of the repetition of arc and short-circuit, and a standard deviation of the time ratio may be calculated. Then, the product may be multiplied by the standard deviation of the time ratio to calculate the welding stability parameter.

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Anjo, Japan

Yukimitsu Suzuki