NDLI: Numerical and Experimental Investigations of Solidification Parameters and Mechanical Property during Laser Dissimilar Welding

Content Provider	Directory of Open Access Journals (DOAJ)
Author	Zhiyong Li Gang Yu Xiuli He Shaoxia Li Yao Zhao
Abstract	Laser beam welding (LBW) has been considered an effective fusion welding method for the dissimilar welding of 304 stainless steel and Ni. However, the principles governing the correlations between the heat input, weld dimension, solidified microstructure and mechanical properties have not been fully studied before. Therefore, LBW experiments with variable heat input were carried out. A transient, three-dimensional model considering liquid metal convection was developed, and solidification parameters such as temperature gradient (G), growth rate (R), and cooling rate (GR) were calculated through thermal analysis to validate the experimental results. Then, microhardness tests were carried out to verify the predications made by the simulation. Energy dispersive spectroscopy (EDS) measurements were performed to study the mass transfer. The results indicate that the joints produced by LBW were nearly defect-free. The heat input per unit length is more effective at characterizing the influence of heat input on weld dimensions. The heat input has a greater influence on the cooling rate (GR) than the morphology parameter (G/R). The results demonstrate that both the solidification characteristics and mechanical property are greatly affected by the thermal behavior in the molten pool.
e-ISSN	20754701
DOI	10.3390/met8100799
Journal	Metals
Issue Number	10
Volume Number	8
Language	English
Publisher	MDPI AG
Publisher Date	2018-01-01
Publisher Place	Switzerland
Access Restriction	Open
Subject Keyword	Mining Engineering. Metallurgy Solidified Microstructure Cooling Rate Microhardness Laser Welding Dissimilar
Content Type	Text
Resource Type	Article

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