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Effects of Hydrogen and Weld Defect on Tensile Properties of SUH660 and SUS316L Welded Joints

Masanobu Kubota 1, Ryosuke Komoda 1, Xuesong Cui 2, Hiroshi Wakabayashi 3, and Yasuhisa Tanaka 3
1. International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka, Japan
2. Graduate School of Kyushu University, Fukuoka, Japan
3. Nagano Keiki, Ueda, Japan

Abstract—The effect of hydrogen on the tensile properties of the SUH660 and SUS316L different materials welded joints was characterized in conjunction with the joint shape and weld defects. The butt welded joint specimen without weld defect fractured at the SUS316L base material, and did not cause hydrogen embrittlement (HE). However, the failure position of the spigot-lap welded joint specimen moved from the SUS316L base material to the weld part when hydrogen charging was applied. This resulted in a significant reduction of the elongation. It was presumed that the HE was induced by the stress concentration due to the weld shape. The weld defect induced HE in both joints. The weld defect was produced by incomplete penetration. It also caused incomplete mixing of the weld metal. Consequently, filler nickel segregated around the weld defect, then HE occurred. 

Index Terms—hydrogen, weld joint, different materials weld, tensile properties, weld defect

Cite: Masanobu Kubota, Ryosuke Komoda, Xuesong Cui, Hiroshi Wakabayashi, and Yasuhisa Tanaka, "Effects of Hydrogen and Weld Defect on Tensile Properties of SUH660 and SUS316L Welded Joints" International Journal of Mechanical Engineering and Robotics Research, Vol. 8, No. 5, pp. 713-718, September 2019. DOI: 10.18178/ijmerr.8.5.713-718

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