高強度冷延鋼板のスポット溶接性(溶接・疲労)(<特集>高強度薄鋼板)

概要

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The acceptable welding current range for nugget formation and mechanical strength of welded joint have been studied in relation to tensile strength and electrical resistivity of steel sheet, and electrode force in welding. The lower limit, I_<low>(kA), of welding current for nugget formation and the upper limit, I_<upp>(kA), for avoiding expulsion decrease with the increase in tensile strength of steel sheet, in which the upper limit decreases more remarkably than the lower one. The decreasing tendency is well explained in terms of tensile strength, TS(kgf/mm^2), and electrical resistivity, ρ(μ-Ωcm), of steel sheet as in the following : I_<low>=9.50-0.030TS-0.060ρ I_<upp>=11.27-0.032TS-0.081ρ Tensile shear strength and cross tension strength of welded joint increase with the increase in tensile strength of steel sheet. The increment of cross tension strength is smaller than that in tensile shear strength. Cross tension strength appears to be largely affected by hardness distribution across the heat affected zone, which is influenced by chemical composition of steel sheet.
社団法人日本鉄鋼協会の論文
1982-07-01