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

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• 作者：Eun-Joon Chun ; Hayato Baba ; Kazutoshi Nishimoto…
• 关键词：metals ; welding ; defect ; solidification ; segregation
• 刊名：Metals and Materials International
• 出版年：2015
• 出版时间：May 2015
• 年：2015
• 卷：21
• 期：3
• 页码：543-553
• 全文大小：1,286 KB
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• 作者单位：Eun-Joon Chun (1)
  Hayato Baba (1)
  Kazutoshi Nishimoto (2)
  Kazuyoshi Saida (1)
  
  1. Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita-shi, Osaka, 565-0871, Japan
  2. Department of the Application of Nuclear Technology, Fukui University of Technology, Gakuen 3-6-1, Fukui-shi, Fukui, 910-8505, Japan
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Metallic Materials
  Operating Procedures and Materials Treatment
  
• 出版者：The Korean Institute of Metals and Materials, co-published with Springer Netherlands
• ISSN：2005-4149

文摘

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.