| 摘要 |
A pair of plate type works (12H, 12M) being transferred are guided during a guide step or by a guide unit (guide rollers (14) and guide members(18U, 18S)) so that a contact length WH of a roller electrode (20U) with respect to the plate type work (12H) becomes smaller than that WM of the other roller electrode (20S) with respect to the plate type work (12M), i.e., so that a contact area of the roller electrode (20U), which is on the side of the plate type work (12H) of a larger thickness, out of the two roller electrodes (20U, 20S) becomes smaller than that of the roller electrode (20S) which is on the side of the plate type work (12M) of a smaller thickness. Accordingly, a crushing amount by one roller electrode (20U) out of the two roller electrodes (20U 20S) with respect to the plate type work (12H) becomes larger than that of the other roller electrode (20S) with respect to the plate type work (12M), so that a position in which an interface G of the two plate type works (12H, 12S) is formed, is offset toward an intermediate position between the two roller electrodes. Therefore, a fused portion N formed in a position halfway between the two roller electrodes (20U, 20S) reliably includes the position of formation of the interface G, and a percentage of occupation RN of nugget, i.e. a ratio WN/WG of a width WN of the fused portion N in the direction of the interface G to that WG of the interface G increases. This enables a satisfactory weld strength to be obtained.
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