Numerical and Experimental Investigations of Solidification Parameters and Mechanical Property during Laser Dissimilar Welding
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...
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MDPI AG
2018-10-01
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| Series: | Metals |
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| Online Access: | http://www.mdpi.com/2075-4701/8/10/799 |
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| author | Zhiyong Li Gang Yu Xiuli He Shaoxia Li Yao Zhao |
| author_facet | Zhiyong Li Gang Yu Xiuli He Shaoxia Li Yao Zhao |
| author_sort | Zhiyong Li |
| collection | DOAJ |
| description | 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. |
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| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-10T06:07:07Z |
| publishDate | 2018-10-01 |
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| spelling | doaj.art-06d7c306e263468892cfe99d4f472d022022-12-22T01:59:39ZengMDPI AGMetals2075-47012018-10-0181079910.3390/met8100799met8100799Numerical and Experimental Investigations of Solidification Parameters and Mechanical Property during Laser Dissimilar WeldingZhiyong Li0Gang Yu1Xiuli He2Shaoxia Li3Yao Zhao4Key Laboratory of Mechanics in Advanced Manufacturing, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, ChinaKey Laboratory of Mechanics in Advanced Manufacturing, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, ChinaKey Laboratory of Mechanics in Advanced Manufacturing, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, ChinaKey Laboratory of Mechanics in Advanced Manufacturing, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, ChinaKey Laboratory of Mechanics in Advanced Manufacturing, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, ChinaLaser 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.http://www.mdpi.com/2075-4701/8/10/799laser weldingdissimilarsolidified microstructurecooling ratemicrohardness |
| spellingShingle | Zhiyong Li Gang Yu Xiuli He Shaoxia Li Yao Zhao Numerical and Experimental Investigations of Solidification Parameters and Mechanical Property during Laser Dissimilar Welding Metals laser welding dissimilar solidified microstructure cooling rate microhardness |
| title | Numerical and Experimental Investigations of Solidification Parameters and Mechanical Property during Laser Dissimilar Welding |
| title_full | Numerical and Experimental Investigations of Solidification Parameters and Mechanical Property during Laser Dissimilar Welding |
| title_fullStr | Numerical and Experimental Investigations of Solidification Parameters and Mechanical Property during Laser Dissimilar Welding |
| title_full_unstemmed | Numerical and Experimental Investigations of Solidification Parameters and Mechanical Property during Laser Dissimilar Welding |
| title_short | Numerical and Experimental Investigations of Solidification Parameters and Mechanical Property during Laser Dissimilar Welding |
| title_sort | numerical and experimental investigations of solidification parameters and mechanical property during laser dissimilar welding |
| topic | laser welding dissimilar solidified microstructure cooling rate microhardness |
| url | http://www.mdpi.com/2075-4701/8/10/799 |
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