軟質溶接継手の HT 80 水圧鉄管現場円周継手への適用性について(第 2 報) : 継手性能の検討

概要

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In this report, joint performance tests of HT 80 heavy plates for penstock with lower strength weld metal are carried out to investigate load-carrying capacity, joint ductility, brittle fracture initiation and fatigue behavior. Test results obtained are summarized as follows : (1) According to the tension tests of transverse welded wide plate specimens free from appreciable weld flaws, joint strength σ_u and percent elongation ε_u in a large gauge length are given by the conventional formulas, [numerical formula] in which σ^W_u, σ^B_u are tensile strength obtained by coupon test of weld metal and base plate respectively. The σ_u-value of the specimen welded with the JIS D 5816 type electrode is found to clear 80kg/(mm)^2 or the nominal tensile strength level of the base plate. (2) As the results of fluctuating tensile fatigue test of butt welded specimen with reinforcement, fatigue crack is not suspected to initiate during service life of the penstock under planning even when the undermatching electrode is applied to circumferential weld connections. It is also found by the tension test of welded wide plate specimens with a surface notch at a weld fusion line that there is no difference in fracture strength at the temperatures ranging 0℃ through-20℃ between welded specimens made with the AWS E 11016 type and the JIS D 5816 type electrodes.
社団法人溶接学会の論文
1978-10-05