Chen Yunxia, Xu Xiao, Liu Yanjing, Cui Haichao
School of Mechanical Engineering, Shanghai Dianji University, Shanghai 201306, China.
Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, Shanghai 200240, China.
Materials (Basel). 2023 Mar 9;16(6):2212. doi: 10.3390/ma16062212.
Welding and the behavior of the weldments are important, since welding of high strength low alloy (HSLA) steels is a conventional method for manufacturing industrial parts. This work conducts a comparative investigation of microstructural characteristics and mechanical properties for joints of 16-mm-thick HSLA Q890 steel produced by multi-layer multi-pass shielded metal arc welding (SMAW) with filler wire and single-layer autogenous laser beam welding (LBW). The mechanical properties of the welded joints were assessed in terms of tensile and impact using butt joints. The results show that tensile failure occurred in the base metal during the tensile tests for most of the trials. The ultimate tensile strength and percent elongation of the LBW welded joint (973.5 MPa and 10%) are higher than those of the SMAW joint (951 MPa and 2.9%) due to the filler filling process of the SMAW process. The Charpy impact energy of the weld metal (16.4 J and 15.1 J) is lower than that of the heat-affected zone (18.5 J and 19.5 J) in the LBW joint and the SMAW joint.
焊接及焊件的性能很重要，因为高强度低合金（HSLA）钢的焊接是制造工业零件的一种传统方法。本文对采用带填充焊丝的多层多道手工电弧焊（SMAW）和单层自熔激光束焊（LBW）生产的16毫米厚HSLA Q890钢接头的微观结构特征和力学性能进行了对比研究。使用对接接头，通过拉伸和冲击试验对接头的力学性能进行了评估。结果表明，在大多数拉伸试验中，母材发生了拉伸破坏。由于手工电弧焊工艺的填充过程，激光束焊接接头的抗拉强度极限（973.5兆帕）和伸长率（10%）高于手工电弧焊接头（951兆帕和2.9%）。在激光束焊接接头和手工电弧焊接头中，焊缝金属的夏比冲击能量（16.4焦和15.1焦）低于热影响区（18.5焦和19.5焦）。
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