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Microstructure Evolution of UFG Steel Weld by Hybrid and Laser Welding  

Dong, H.W. (부경대학교 대학원)
Lee, M.Y. (포항산업과학연구원 용접연구센터)
Ahn, Y.S. (부경대학교 재료공학부)
Publication Information
Journal of Power System Engineering / v.14, no.3, 2010 , pp. 58-63 More about this Journal
Abstract
A laser beam welding and an electric arc welding were combined, and the positive points of each welding method are drawn such as high speed, low thermal load, deep penetration, and high productivity. The fiber laser-MIG conjugated welding. namely the hybrid welding has been studied mainly for the automation industry of a pipeline welding. In this study, the MIG welding was combined with a fiber laser welding to make up the hybrid welding. The weld shapes, microstructures and mechanical properties for weld zones after the hybrid welding or only fiber laser welding were investigated on the 700 MPa grade Ultra Fine Grained(UFG) high strength steel. The amount of acicular ferrite in weld metals and HAZ(heat affected zone) was observed larger after hybrid welding compared with after only laser welding. The Vickers hardness of the top area of the fusion zone after fiber laser welding was higher compared with after hybrid welding.
Keywords
Hybrid Welding; Fiber-laser Welding; Ultra Fine Grained Steel; Microstructure;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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