Seam welding method and vehicle body

Patent metadata

Field	Value
Publication number	US-2016136751-A1
Application number	US-201414900874-A
Country	US
Kind code	A1
Filing date	Jun 25, 2014
Priority date	Jun 25, 2013
Publication date	May 19, 2016
Grant date	—

Abstract

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.

First claim

1 . A seam welding method for joining a workpiece which are plural laminated metal sheets temporarily fastened together through spot welding, comprising:
holding a welding portion of the workpiece between a pair of roller electrodes; pressing the roller electrodes against the workpiece with a predetermined pressing force; and rolling the roller electrodes on the workpiece along a planned welding portion which is preset, and energizing the roller electrodes to seam weld the welding portion, wherein: the pressing force applied to the workpiece by the roller electrodes is reduced below the predetermined pressing force and an energization to the roller electrodes is stopped when the roller electrodes which are rolling on the workpiece along the planned welding portion pass at least a portion where the metal sheets are temporarily fastened together through spot welding; and the pressing force applied to the workpiece by the roller electrodes and the energization to the roller electrodes are restored after the roller electrodes which are rolling on the workpiece along the planned welding portion have passed the portion where the metal sheets are temporarily fastened together through spot welding.

2 . The seam welding method according to claim 1 , wherein
the pressing force applied to the workpiece by the roller electrodes is reduced to a smallest pressing force that can hold the workpiece when the roller electrodes which are rolling on the workpiece along the planned welding portion pass at least the portion where the metal sheets are temporarily fastened together through spot welding.

3 . A vehicle body which is formed by joining plural laminated metal sheets together through welding, comprising:
a first welded joint portion which is formed through seam welding at least at a portion of a welded joint area, which extends linearly along the welded joint area and which has an end portion on either side thereof, and a spot welded area where a second welded joint portion is formed through spot welding in at least a position which faces the end portion of the first welded joint portion.

4 . The vehicle body according to claim 3 , wherein the spot welded area includes a boundary portion where number of laminated metal sheets differ.

5 . The vehicle body according to claim 3 ,
wherein the spot welded area includes a corner portion.

Assignees

• Honda Motor Co Ltd

Inventors

• Kawai Yasuhiro
• Kurimoto Noriko
• Kaneko Mitsugu
• Kobayashi Haruhiko
• Yamaashi Kazuhiko

Classifications

• B23K2101/006

  Vehicles · CPC title

• B23K11/11

  Spot welding · CPC title

• B62D25/02

  Side panels {(B62D33/046 takes precedence; sideboards for open load compartments B62D33/023)} · CPC title

• B23K11/065 Primary

  for welding curved planar seams · CPC title