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Metallurgical and Mechanical Properties of Fibrous Laser Welded Thick Q890 High Strength Low Alloy Steel with Varying Weld Geometries

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Abstract

The investigation was aimed at evaluating the metallurgical and mechanical properties of high-speed fiber laser welded thick Q890 high strength low alloy (HSLA) steel with varying weld geometries instead of multi-layer multi-pass electric arc welding which led to the low machining efficiency and produced multiple sandwich structures in welding joints. 16 mm thick Q890 low alloy high strength steel plate was conducted based 2.5 and 5 mm gap size, respectively. The results showed that the size of hardening and softening zone was reduced by lower heat input laser welding with filling metal. The average width of HAZ was 1.2 mm in 2.5 gap and 1.9 mm in 5 mm gap. The maximum hardness was 485 HV and 482 HV and the minimum was 323 HV and 333 HV, respectively. The average width of softening zone was 0.8 mm and minimum hardness was 323 HV. The tensile properties could meet the standard requirement. The elongation rate was 10.4 and 7.6%, respectively, in 2.5 and 5 mm gap. The Charpy impact energy values of HAZ were 13.48 and 12.97 J, respectively. The weld seam was 21.11 and 16.09 J separately. Comparably, the profile of weld seam was better in 2.5 mm gap size.

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Acknowledgments

This work is financially supported by the National Natural Science Foundation of China (No. 51809161) and (No. 52005315). The authors gratefully acknowledge Prof. Lu Fenggui from SJTU for fruitful discussions and suggestions and are indebted to Shanghai multi-directional die forging Engineering Technology Research Center (No. 20DZ2253200), which has contributed to the technical support of some aspects of this study.

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Authors and Affiliations

  1. School of Mechanical Engineering, Shanghai Dianji University, Shanghai, China

    Yunxia Chen & Chenxi Chen

  2. Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, Shanghai, China

    Yanjing Liu & Haichao Cui

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  1. Yunxia Chen
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Correspondence to Haichao Cui.

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Chen, Y., Liu, Y., Chen, C. et al. Metallurgical and Mechanical Properties of Fibrous Laser Welded Thick Q890 High Strength Low Alloy Steel with Varying Weld Geometries. J. of Materi Eng and Perform 31, 4434–4443 (2022). https://doi.org/10.1007/s11665-021-06516-3

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