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Effect of heat input on mechanical performance and corrosion behaviors of local dry underwater pulsed MIG SUS304 weldments

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Abstract

To reveal the influence mechanism of linear heat input (LHI) on the mechanical properties and corrosion behaviors of SUS304 weldments manufactured by local dry underwater pulsed metal inert-gas welding (LDU-PMIG), phase structure, grain structure, grain preferred orientation, and grain type of weld metal (WM) were investigated in this paper. With LHI increasing, ferrite phase morphology transformed from lath to skeleton, and grain size was enlarged. The content of equiaxed grains was increased, and that of columnar grains was reduced remarkably. The mechanical performance ascended first and then reduced with the increase of LHI. The increase of equiaxed grain content and the diversification of grain preferred orientation were beneficial to the improvement of mechanical performance, then, grain coarsening led to mechanical performance decreasing. Besides, the corrosion potential, corrosion current and pitting potential of WM were detected through electrochemical corrosion tests. The results illustrated that the corrosion resistance of WM was lower than that of base metal (BM), and the corrosion rate was enlarged with LHI enhancing, which meant the corrosion resistance declining. The corrosion resistance was mainly determined by Cr precipitates, ferrite phase and grain size. The microhardness, tensile strength, and elongation reached their maxima in the LHI of 336.7 J/mm. The greatest corrosion resistance of WM was obtained in the LHI of 256.2 J/mm and reached 69.9% of BM. This study is meaningful to promote the further development and application of LDU-PMIG in marine underwater welding field.

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Data availability

The datasets generated and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors are thankful to editors and reviewers.

Funding

This work was supported by the Science and Technology Program of Guangdong Province (Grant number 2021B1515420006, 2021B1515120026), National Natural Science Foundation of China (Grant number U23A20625, U2141216, 52375334, 52305357), the National Key Research and Development Project of China (Grant number 2023YFB3407703), and the Shenzhen Science and Technology Plan (Grant number KJZD20230923114614029), National Defense Key Laboratory Fund Project (Grant number 61420052022WD011).

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Authors and Affiliations

  1. School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou, 510641, China

    Zhenmin Wang, Bin Zhang, Haipeng Liao, Xiangmiao Wu & Jiyu Tian

  2. School of Computer Science & Engineering, South China University of Technology, Guangzhou, 510006, China

    Qin Zhang

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  1. Zhenmin Wang
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  2. Bin Zhang
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Zhenmin Wang: conceptualization; funding acquisition; review and editing the manuscript; supervision. Bin Zhang: original draft preparation; investigation and summary of partial content in the manuscript; review. Haipeng Liao: conceptualization; experiment; review; supervision. Xiangmiao Wu: review; methodology. Jiyu Tian: writing; review; supervision; methodology. Qin Zhang: review and editing.

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Wang, Z., Zhang, B., Liao, H. et al. Effect of heat input on mechanical performance and corrosion behaviors of local dry underwater pulsed MIG SUS304 weldments. Int J Adv Manuf Technol 131, 1645–1664 (2024). https://doi.org/10.1007/s00170-024-13191-w

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