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Effects of weld cross-section profiles and microstructure on properties of pulsed Nd:YAG laser welding of Ti6Al4V sheet

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Abstract

In this study, the influence of weld cross-sectional profiles and microstructure, under different welding conditions, was investigated on the mechanical properties of pulsed Nd:YAG laser-welded joint of Ti6A14V alloy. The V- and H-shaped weld cross-section profiles were obtained under low and high heat input, respectively. The microstructure in the fusion zone (FZ) of V- and H-shaped welded joint consisted of a fine acicular martensitic α′ solidification structure within the prior-β grains, responsible for the maximum hardness in the FZ. Tensile tests revealed that the V-shaped welded joint fractured at the near heat-affected zone (HAZ)/base metal (BM) interface, but the H-shaped welded joint fractured in the BM. Furthermore, the tensile strength of the V-shaped welded joint was lower than that of the H-shaped welded joint. This was attributed to the fact that the heterogeneity of strain distribution at the interface of HAZ and BM of the V-shaped welded joint was greater than that of the H-shaped welded joint during tensile process.

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Authors and Affiliations

  1. State Key Laboratory of Mechanical Behavior for Materials, Xi’an Jiaotong University, Xi’an, 710049, China

    Xiao-Long Gao, Lin-Jie Zhang, Jing Liu & Jian-Xun Zhang

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  1. Xiao-Long Gao
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  2. Lin-Jie Zhang
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  3. Jing Liu
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  4. Jian-Xun Zhang
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Correspondence to Lin-Jie Zhang.

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Gao, XL., Zhang, LJ., Liu, J. et al. Effects of weld cross-section profiles and microstructure on properties of pulsed Nd:YAG laser welding of Ti6Al4V sheet. Int J Adv Manuf Technol 72, 895–903 (2014). https://doi.org/10.1007/s00170-014-5722-x

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  • DOI: https://doi.org/10.1007/s00170-014-5722-x

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