局部的劣化部を含む鋼溶接継手の曲げ限界COD値と引張破壊強度(昭和59年度秋季全国大会論文発表講演論文)

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Critical COD values of weld metal obtained by standard bending COD test are often scattered widely. One of the causes of the scattering will be local embrittlement-zones in weld metal which are inevitable in multi-pass welding. In the present study, statistic investigations of the critical COD δ_c obtained by both bending tests and tensile tests are made. Standard bending COD specimens and notched-welded tensile specimens are cut from weldments of a steel for low temperature use, 22 mm thick. Weld metal of each specimen includes artificial embrittlement zones of different sizes ranging between 4 mm and 22 mm in depth. Tensile tests are made by a 600 tons testing machine with a coned disc spring. It is demonstrated that the standard bending COD test is much sensitive to existence of local embrittlement-zone in weld metal than notched tensile test : Cumulative frequency of the δ_c values in bending test is almost the same independent to the depth of embrittlement zone. On the other hand, the δ_c values in tensile test are increased with decrease of the depth, and in the tensile specimens with an embrittlement zone of 4-5 mm in depth, final fracture is occurred at net stress level as high as yield stress of the material, although in some specimens the first fracture is observed as pop-in at lower COD level. Statistic study reveals that the δ_c values of the tensile specimens with an embrittlement zone ranging 4 mm-18 mm in depth are 1.5-2 times the δ_c values of the bending specimens.
社団法人溶接学会の論文
1984-08-05

局部的劣化部を含む鋼溶接継手の曲げ限界COD値と引張破壊強度(昭和59年度秋季全国大会論文発表講演論文)

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