431 ステンレス鋼ろう付圧接継手における鋭敏化の評価(溶接・接合のプロセスと評価(2,加工・検査のロボット・知能化,ものづくりにおける基礎研究と先端技術の融合)

概要

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It was investigated that effect of the thermal history during the braze-pressure-welding process for the austenitic stainless steel to its sensitization property. The SUS304 austenitic stainless steel pipes were joined using the braze-pressure-welding method with the induction heating. The cleaning metal, or insert metal, was the Fe-base alloy (Fe(Bal.)-20Cr-l0Ni-3Si- 2.5B-1Mo). For the cross section samples of the pipe wall with various distance from the joint interface, the degree of the sensitization was measured using the EPR method. The grain size of the samples was also measured to modify the degree of the sensitization. The value of the sensitization was high at the vicinity of the joint interface, but it dropped with the distance. It was shown that the severe sensitization did not occur by the BPW process.
2010-11-27