Microstructure and mechanical properties of laser beam welded 10 mm-thick Q345 steel joints

Q4 Materials Science

Welding International Pub Date : 2023-11-13 DOI:10.1080/09507116.2023.2281502

Weifeng Xie, Hao Tu, Keyu Nian, Xiaobin Zhang

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Abstract

AbstractThe present study systematically investigated the effects of a laser welding speed and a defocusing amount on the microstructure and mechanical properties of low alloy high strength Q345 steel joints. The macro-morphology, microstructure, Vickers microhardness, and tensile properties of as-welded joints were analyzed. The results indicated a significant correlation between the laser welding speed and the size of individual zones within the welded joint. As the laser welding speed increased, the size of each zone decreased noticeably. The microstructure of the fusion zone was composed of proeutectoid ferrite, ferrite side-plate, and acicular ferrite. An increase in welding speed and defocusing amount facilitated microstructural changes towards formation of ferrite side-plate and acicular ferrite. Maximum tensile strength and maximum elongation of as welded joints were measured to be 669 MPa and 21.8%, respectively. The joints with maximum tensile strength tended to fracture within the fusion zone. The increase in welding speed and defocusing amount caused a significant decrease in normalized enthalpy and volumetric energy density.Keywords: Q345 steellaser welding speeddefocusing amountmicrostructuremechanical properties AcknowledgementsThe authors acknowledge funding from the Natural Science Foundation of Jilin Province (No. 20220101250JC), China.Disclosure statementThe authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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激光焊接10mm厚Q345钢接头的组织和力学性能

摘要本文系统地研究了激光焊接速度和离焦量对低合金高强度Q345钢接头组织和力学性能的影响。分析了焊接接头的宏观形貌、显微组织、维氏显微硬度和拉伸性能。结果表明，激光焊接速度与焊接接头内各个区域的尺寸有显著的相关性。随着激光焊接速度的增加，各区域的尺寸明显减小。熔合区组织由原共析铁素体、铁素体侧板和针状铁素体组成。随着焊接速度和离焦量的增加，微观组织向铁素体侧板和针状铁素体的形成方向转变。焊接接头的最大抗拉强度为669 MPa，最大伸长率为21.8%。抗拉强度最大的接头在熔合区内倾向断裂。焊接速度和离焦量的增加导致归一化焓和体积能量密度的显著降低。关键词:Q345钢激光焊接速度离焦量显微组织力学性能致谢作者感谢吉林省自然科学基金(20220101250JC)资助披露声明作者声明，他们没有已知的竞争经济利益或个人关系，可能会影响本文所报道的工作。

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来源期刊

Welding International Materials Science-Metals and Alloys

CiteScore

0.70

自引率

0.00%

发文量

期刊介绍： Welding International provides comprehensive English translations of complete articles, selected from major international welding journals, including: Journal of Japan Welding Society - Japan Journal of Light Metal Welding and Construction - Japan Przeglad Spawalnictwa - Poland Quarterly Journal of Japan Welding Society - Japan Revista de Metalurgia - Spain Rivista Italiana della Saldatura - Italy Soldagem & Inspeção - Brazil Svarochnoe Proizvodstvo - Russia Welding International is a well-established and widely respected journal and the translators are carefully chosen with each issue containing a balanced selection of between 15 and 20 articles. The articles cover research techniques, equipment and process developments, applications and material and are not available elsewhere in English. This journal provides a valuable and unique service for those needing to keep up-to-date on the latest developments in welding technology in non-English speaking countries.