Mash seam welding process and mash seam welding apparatus

a welding process and mash seam technology, applied in the direction of welding/soldering/cutting articles, manufacturing tools, welding with roller electrodes, etc., can solve the problems of easy cracking on the surface of plate-like workpieces, increased nugget ratio r.sub.n, and difficulty in obtaining desired weld strength in some cases, so as to achieve sufficient weld strength and high welding speed. , the effect of high contact resistan
USRE36612E1Inactive Publication Date: 2000-03-14TOYOTA JIDOSHA KK
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Patents(United States)
Current Assignee / Owner
TOYOTA JIDOSHA KK
Publication Date
2000-03-14
Estimated Expiration
Not applicable · inactive patent

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Abstract

PCT No. PCT / JP96 / 00410 Sec. 371 Date Dec. 24, 1996 Sec. 102(e) Date Dec. 24, 1996 PCT Filed Feb. 23, 1996 PCT Pub. No. WO96 / 26037 PCT Pub. Date Aug. 29, 1996Mash seam welding process and apparatus, wherein two plate-like workpieces having different thickness values are fed and guided by a guiding device such that a length WH of contact of the thick plate-like workpiece with one of two roller electrodes is smaller than a length WM of contact of the thin plate-like workpiece with the other roller electrode. In this arrangement, the amount of mashing of the thick plate-like workpiece by the roller electrode is made larger than that of the thin plate-like workpiece by the other roller electrode, so that an interface of the two plate-like workpieces is positioned intermediate between the pair of roller electrodes, whereby a weld nugget formed intermediate between the roller electrodes extends across the interface, permitting the weld to have a sufficient strength owing to a nugget ratio, which is a ratio of a width dimension WN of the weld nugget in the direction of the interface to a width dimension WG of the interface.
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Description

FIELD OF THE ARTThis invention relates to a mash seam welding process and a mash seam welding apparatus for continuously welding together two plate-like workpieces by overlapping the workpieces at their edges and applying a welding current between a pair of roller electrodes while the overlapping edge portions of the two plate-like workpieces are squeezed to be mashed, by and between the pair of roller electrodes.BACKGROUND TECHNOLOGYHigh-speed welding is possible by mash seam welding in which two plate-like workpieces are continuously welded together at their overlapping edge portions while the edge portions are squeezed to be mashed by and between a pair of roller electrodes, with a welding current being applied between the pair of roller electrodes. Since the mash seam welding is suitable for mass production, it is widely employed in production lines for steel plates, automobiles, etc.In the mash seam welding described above, the two plate-like workpieces are positioned relative ...

Claims

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