MASH-SEAM WELDING METHOD AND MASH-SEAM WELDING MACHINE

摘要

The pair of (two pieces) plate-shaped workpieces 12 _H and 12 _M are formed of a thick plate-shaped workpiece 12 _H having one roller electrode 20 _U of the two roller electrodes 20 _U and 20 _S. Moved by the guide device 14, 18 _U , 18 _S so that the contact length W _H is shorter than the contact length W _M of the thin plate-shaped workpiece 12 _M having the other roller electrode 20 _S. It relates to a mash seam welding method and apparatus that is guided (returned). In this configuration, the plate-like by a pair of roller electrodes (20 _U, 2O _S) one roller electrode (2O _U) plate-like workpieces (12 _H) the other roller electrode (20 _S) the amount of push-on by the workpiece becomes more than the depression amount of the (12 _M), the interface (G) is a roller electrode for location doemeurosseo, a pair of intermediate position of the roller electrode of the pair of plate-like workpieces (12 _H, 12 _M) of dumae The weld nugget portion N formed at the intermediate position of (20 _U , 20 _S ) is in a state including the formation position of the boundary surface G reliably, and the boundary surface with respect to the width size W _G of the boundary surface _G. The nugget occupancy ratio R _N , which is the ratio W _N / W _G of the width W _N of the welding nugget portion N in the (G) direction, becomes large, so that sufficient weld strength is obtained.