溶接継手特性に及ぼす人工内蔵欠陥の影響

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When steel structures such as penstock are assembled by welding at a site, welding defects may be induced. So, it is important to know the effect of welding defects on mechanical properties of the welded joints. Tensile and fatigue tests were carried out using by test specimen with an artificial defect in the weld metal. Material was SM490 that is generally used in penstock. When the strength of the weld metal was higher than that of the base metal, the tensile strength and elongation of the welded joints little decreased. Contrary to this, when the strength of the weld metal was lower than that of the base metal, the tensile strength and elongation were remarkably decreased. Especially, as there is little elongation in the base metal, elongation of the welded joints was largely decreased. That is, the tensile strength and elongation were dominated by the strength of the weld metal. In the fatigue tests in which the specimen with the drilled hole (the diameter is 1-4 (mm)) was used, the specimen was fractured after a crack was initiated from the toe of weld. The fatigue strength of the specimen with the volume-type defect was almost same as the strength of the specimen without defects. Contrary to this, in the fatigue tests in which the specimen with the incomplete penetration (the depth is 1.6-5.4 (mm)) was used, the specimen was fractured after a crack was initiated from the tip of the defect. The fatigue strength of the specimen with the plane-type defect was largely decreased comparing to the strength of the specimen without defects.
社団法人溶接学会の論文
1999-11-05

溶接継手特性に及ぼす人工内蔵欠陥の影響

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