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Development of laser beam welding transverse-varestraint test for assessment of solidification cracking susceptibility in laser welds

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Abstract

In order to quantitatively evaluate the solidification cracking susceptibility in laser welds of type 310S stainless steel, a transverse-Varestraint testing system using a laser beam welding apparatus was newly constructed. The timing-synchronization between the laser oscillator, welding robot and hydraulic pressure devices was established by employing high-speed camera observations together with electrical signal control among the three components. Moreover, the yoke-drop time measured by the camera was used to prevent underestimation of the crack length. The laser beam melt-run welding used a variable welding speed from 10.0 to 40.0 mm/s, while the gas tungsten arc welding varied the welding speed from 1.67 to 5.00 mm/s. As the welding speed increased from 1.67 to 40.0mm/s, the solidification brittle temperature range of type 310S stainless steel welds was reduced from 146 to 120 K. It follows that employing the laser beam welding process mitigates the solidification cracking susceptibility for type 310S stainless steel welds.

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Authors and Affiliations

  1. Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita-shi, Osaka, 565-0871, Japan

    Eun-Joon Chun, Hayato Baba & Kazuyoshi Saida

  2. Department of the Application of Nuclear Technology, Fukui University of Technology, Gakuen 3-6-1, Fukui-shi, Fukui, 910-8505, Japan

    Kazutoshi Nishimoto

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  1. Eun-Joon Chun
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  2. Hayato Baba
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  4. Kazuyoshi Saida
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Correspondence to Eun-Joon Chun.

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Chun, EJ., Baba, H., Nishimoto, K. et al. Development of laser beam welding transverse-varestraint test for assessment of solidification cracking susceptibility in laser welds. Met. Mater. Int. 21, 543–553 (2015). https://doi.org/10.1007/s12540-015-4394-x

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