Plasma and Fusion Research

Volume 10, 3405015 (2015)

Regular Articles

Weldability of 9Cr-ODS and JLF-1 Steels for Dissimilar Joining with Hot Isostatic Pressing and Electron Beam Welding
Haiying FU1), Takuya NAGASAKA1,2), Takeo MUROGA1,2), Wenhai GUAN3), Shuhei NOGAMI3), Akira HASEGAWA3) and Hisashi SERIZAWA4)
1)
SOKENDAI (The Graduate University for Advanced Studies), 322-6 Oroshi-cho, Toki 509-5292, Japan
2)
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
3)
Tohoku University, 6-6-01-2 Aramaki-aza-Aoba, Aoba-ku, Sendai 980-8578, Japan
4)
Joining and Welding Research Institute, Osaka University, 11-1 Mihogaoka, Ibaraki 567-0047, Japan
(Received 24 November 2014 / Accepted 23 January 2015 / Published 16 April 2015)

Abstract

Dissimilar joints between 9Cr-ODS and JLF-1 were fabricated by hot isostatic pressing (HIP) and by electron beam welding (EBW), respectively. Compared to the HIP at 1000 °C, HIP at higher temperatures of 1050 °C and 1100 °C is effective to improve the joining strength of the joints. All the as-HIPed joints fractured at the interface during tensile tests. 1050 °C-HIP showed the best joining strength and reduction of area. Post-weld heat treatment (PWHT) with normalization and tempering (N&T) could further improve the joining properties of the HIPed joints. The joints fractured outside the interface at the JLF-1 base metals. EBW showed better weld-ability than HIP, because the joint made by EBW did not fracture at the weld metal during tensile tests, but always fractured at JLF-1 side. However, the properties of the HIPed joints were improved after PWHT with N&T, and were comparable to that made by EBW.

Keywords

hot isostatic pressing, electron beam welding, post-weld heat treatment, joining strength

DOI: 10.1585/pfr.10.3405015

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This paper may be cited as follows:

Haiying FU, Takuya NAGASAKA, Takeo MUROGA, Wenhai GUAN, Shuhei NOGAMI, Akira HASEGAWA and Hisashi SERIZAWA, Plasma Fusion Res. 10, 3405015 (2015).