Laser Welding of Seal Tube for Instrumented Irradiation Fuel Test

Kim, Soo-Sung; Lee, Chul-Yong; Kim, Woong-Ki; Park, Geun-Il; Koh, Jinh-Yun; Seo, Jun-Seok

Journal of KWJS 2005;23(6):43-48.
Published online January 26, 2006.

[기술논문]계장핵연료 조사시험용 실튜브 레이저용접기술

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Laser Welding of Seal Tube for Instrumented Irradiation Fuel Test

Soo-Sung Kim, Chul-Yong Lee, Woong-Ki Kim, Geun-Il Park, Jinh-Yun Koh, Jun-Seok Seo

Abstract

This work was carried out to obtain sound welds and to select a most suitable binary metal joint among three different dissimilar binary metal combinations such as Zr-4/Ta, Mo/Ta and Ti/Ta(seal tube/sensor sheath) joints for the instrumented nuclear fuel irradiation test. To do this, Taguchi experimental method was employed to optimize the experimental data. In addition, metallography, micro-focus x-ray radiography and hardness test were conducted to examine the welds. From the weld bead appearance, penetration depth and bead width as well as weld defects standpoint, Zr-4/Ta joint is suggested for the circumferential joining between a seal tube and a sensor sheath. The optimized welding parameters based on Zr-4/Ta joint are suggested as well.