溶融亜鉛中における溶接継手強度に及ぼす溶接諸因子の影響 : 溶融亜鉛めっき時における溶接継手の液体金属ぜい化(第1報)

概要

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It is now questionable that the Liquid-Metal-Embrittlement-cracking (LME-cracking) rises in HAZ of welds of steel structure during hot dip galvanizing. Because of preventing the cracking, it is necessary to study the effect of welding factors on the critical stress of steel in molten zinc (σ_<cr>). In this report, the tensile tests were carried out in molten zinc by using the welding joint specimen with U notch in HAZ, and σ_<cr> for each materials used was investigated. The results are as follows.(1) σ_<cr> decreased as the stress concentration (Kt) was large, but it was approximately constant over Kt=3.(2) As the heat input was large, grain size at coarse-grained region was large, maximum vickers hardness in HAZ was lower and σ_<cr> increased.(3) σ_<cr> was linearly arranged by using maximum vickers hardness in HAZ.
1985-05-05