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Effect of Laser Welding Variables on the Formability of Si Added Steel Welds  

Park, Joon-Sik (POSCO Technical Research Lab.)
Woo, In-Su (POSCO Technical Research Lab.)
Lee, Jong-Bong (POSCO Technical Research Lab.)
Publication Information
Journal of Welding and Joining / v.24, no.4, 2006 , pp. 15-21 More about this Journal
Abstract
The aim of present study is to investigate the effect of welding parameters and heat treatment conditions on the formability of the $CO_2$ laser welded silicon steel sheet. It was found that there is optimum range of the heat input ($0.6{\sim}0.7kJ/cm$) and gap distance ($0.125{\sim}0.150mm$) for the high tensile strength and the avoidance of the fracture in weld metal. Also, it was essential fur the improvement of formability to perform pre- and post-welding heat treatment which cause the uniform mixture of base metal and welding consumable.
Keywords
Si steel; Laser welding; Pre-welding heat treatment; Post-welding heat treatment; Formability; Crack;
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