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Journal of KWJS 2006;24(4):15-21.
Published online October 16, 2006.
3wt% Si 첨가강의 레이저용접부 성형성에 미치는 용접변수의 영향
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Effect of Laser Welding Variables on the Formability of Si Added Steel Welds
Joon-Sik Park, In-Su Woo, Jong-Bong Lee
Abstract
  The aim of present study is to investigate the effect of welding parameters and heat treatment conditions on the formability of the CO2 laser welded silicon steel sheet. It was found that there is optimum range of the heat input (0.6~0.7kJ/cm) and gap distance (0.125~0.150mm) for the high tensile strength and the avoidance of the fracture in weld metal. Also, it was essential for the improvement of formability to perform pre- and post-welding heat treatment which cause the uniform mixture of base metal and welding consumable.
Key Words: Si steel, Laser welding, Pre-welding heat treatment, Post-welding heat treatment, Formability, Crack
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