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Vol.10, No2, 2010,
pp.103-109 |
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WELDING HEAT INPUT DETERMINATION IN TIG AND LASER WELDING OF LDX 2101 STEEL BY IMPLEMENTING THE ADAMS EQUATION FOR 2-D HEAT DISTRIBUTION S. Cvetkovski1, L.P. Karjalainen1, V. Kujanpää2, A. Ahmad2 1) University of Oulu, Department of Mechanical Engineering, Oulu, Finland 2) Lappeenranta University of Technology, Lappeenranta, Finland |
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Abstract The heat input applied in arc welding can be estimated based on the power of the welding power source and the thermal efficiency of the welding process. In laser welding, however, the absorption of laser beam can vary very significantly, so that the estimation of laser heat input is difficult. In the present paper a method is described to estimate the real heat input applied in welding based on the determination of the temperature distribution in a welded joint of a duplex stainless steel sheet. The temperature distribution is determined based on observations of the positions of certain metallurgical microstructures in the heat-affected zone. The exact temperatures for the formation of these specific microstructures were obtained by thermal simulation using various peak temperatures and cooling rates. Keywords: TIG welding, laser welding, heat distribution, thermal simulation, duplex stainless steel |
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full article (2.26 MB)
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