SPOT WELDING METHOD FOR A THIN STEEL PLATE AND A SPOT WELDING JOINT
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United States of America Patent
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Nov 21, 2016
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Mar 27, 2015
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Abstract
A spot welding method for a thin steel sheet that is suitably applicable to articles, e.g., automobile parts, for which the appearance of a welded part is important, and has superior positioning quality, welding strength, and formability of a set of protrusions and a recess or a protrusion and a recess to be fitted (projections to be fitted to each other). The spot welding method for welding an upper member and a lower member, each made of a thin steel sheet, with the upper member and the lower member stacked and sandwiched by electrodes includes providing projections that are configured to be used for relative positioning of the upper member and the lower member and to be subjected to welding. The spot welding method also includes forming the projections by drawing so that each of the projections has a truncated cone shape, a gradient from 45° to 70°, and a bottom being opened, wherein the opening has an outer diameter smaller than an outer diameter of the corresponding electrode, and wherein the projections are provided on the upper member and the lower member respectively and are configured to be fitted to each other.
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