Study on microstructure and impact toughness of laser hybrid welding joints

In the study, laser-MIG hybrid welding of high-strength shipbuilding steel was conducted. The microstructure and impact toughness were studied. The microstructure of the Filling and capping weld metal (FCWM) is widmanstatten and acicular ferrite. The microstructure of the backing WM (BWM) and the he...

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Bibliographic Details
Published inMaterials science and technology Vol. 39; no. 1; pp. 117 - 127
Main Authors Han, Zhengpeng, Li, Xiucheng, Shang, Chengjia, Wang, Qichen, Sun, Weihua, Li, Guobao, Guo, Fujian, Xia, Dianxiu
Format Journal Article
LanguageEnglish
Published London, England Taylor & Francis 2023
SAGE Publications
Subjects
heat-affected zone
impact toughness
in-situ microstructure
Laser hybrid welding
shipbuilding steel
in-situ microstructure
shipbuilding steel
heat-affected zone
Laser hybrid welding
impact toughness
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Summary:In the study, laser-MIG hybrid welding of high-strength shipbuilding steel was conducted. The microstructure and impact toughness were studied. The microstructure of the Filling and capping weld metal (FCWM) is widmanstatten and acicular ferrite. The microstructure of the backing WM (BWM) and the heat-affected zone (HAZ) are bainite. The impact energy of the joints is greater than 110 J at different charpy impact test positions. The reason for the different toughness is related to the proportion and distribution of the microstructure at the V-notch of the impact specimen. Through the observation of the section, it is also found that the section corresponding to the microstructure of the different HAZ will show significant differences in fracture morphology.
ISSN:0267-0836
1743-2847
DOI:10.1080/02670836.2022.2130520