Honda Motor Co., Ltd.

Kabushiki Kaisha Yaskawa Denki

Mitsugu Kaneko

Haruhiko Kobayashi

Yasuhiro Kawai

Noriko Kurimoto

Kazuhiko Yamaashi

Takafumi Ikeda

Eisaku Hasegawa

Masami Nakakura

Teppei Sonoda

Yuki Tanihira

The seam welding apparatus includes a pair of rotating electrodes, an electrode supporting frame, a distance measuring means, and a controller. The electrode supporting frame supports the pair of rotating electrodes. The distance measuring means is provided on the electrode supporting frame and measures a distance to an edge of the steel plate. The controller controls the robot to adjust a running direction of the rotating electrodes so that a deviation comes into zero when a distance actually measured by the distance measuring means deviates from a predetermined distance. Thereby, it is accomplished that the seam welding apparatus is downsized as well as uninfluenced by the surface state and/or shape of workpiece (steel plate).

Seam welding apparatus, seam welding method, robot control device, and robot control method

This seam-welding device carries out seam welding while repeating one cycle comprising a melting period, an interruption period, and a heating period implemented either before or after the interruption period. A welding current is applied between a pair of roller electrodes so as to form a welded part between workpieces during the melting period, the application of the current between the roller electrode pair is interrupted so as to solidify the welded part during the interruption period, and a heating current smaller than the welding current is applied between the roller electrode pair so as to heat the laminated body within a solidification temperature range of the welded part during the heating period. Consequently, even when the welding speed is increased, formation of cracks and spatter is effectively suppressed such that a high-quality joined product is obtained.

Seam-welding method and device therefor

In a seam welding method, a pressing force applied to workpiece by roller electrodes is reduced and an energization to the roller electrodes is stopped when the roller electrodes pass at least a portion where metal sheets are temporarily fastened together through spot welding, and the pressing force to the workpiece by the roller electrodes and the energization to the roller electrodes are restored after the roller electrodes have passed the spot welded portion.

Seam welding method and vehicle body

Shifts of a reference point C in a robot coordinate system among three postures of a seam welding apparatusare found, and calibration data is obtained (STEP). Correction data is found from the calibration data based on deformation of elastic unitsdue to weight of the seam welding apparatusin accordance with the posture of the seam welding apparatusrelative to a robot(STEP). Teaching data is corrected based on the correction data (STEP).

Seam welding method and system

A seam welding device sandwiches between a first roller electrode and a second roller electrode a laminate, which is formed by laminating a plurality of workpieces and disposing the thinnest workpiece, which has the smallest thickness among the workpieces, on the outside, to carry out seam welding. The second roller electrode, which is in contact with the thinnest workpiece, is disposed further along the direction of welding progress than the first roller electrode.

Seam welding method and seam welding device

Distance to the upper face of workpieces W sandwiched between electrode rollersandis measured by a range sensorthat has a predetermined positional relationship with the electrode rollersand(STEPs). Correction is made based on the distance found by the range sensorby moving the pair of electrode rollerswith reference to the workpieces W so that an angle Rx between a straight line Lconnecting centers of the pair of electrode rollersand the surface of the plurality of workpieces W is preset angle (STEP).

Method and system for resistance seam welding with electrode rollers

It is an object of the present invention to provide a seam welding warpage prevention method and apparatus capable of preventing warpage caused by cooling contraction after welding, in a case where workpieces are different from one another in material and thickness, and thus not uniform in thermal contraction. In the seam welding warpage prevention method for welding a plurality of workpieces Wand Wthat are not uniform in thermal contraction with respect to an energizing direction, the workpieces Wand Ware clamped with a pair of roller electrodesandwhile applying current. The welding is performed in a state where the roller electrodethat abuts on the workpiece Whaving higher thermal contraction is offset in an advancing direction ahead of the roller electrodethat abuts on the workpiece Whaving lower thermal contraction.

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Tochigi, Japan

Mitsugu Kaneko