Fatigue properties of laser-arc hybrid welded Q345E steel T-joints

被引：0

作者：

Jiang L. ^{[1
]}

Deng Y. ^{[1
]}

Zhao J. ^{[2
]}

Huang F. ^{[2
]}

Ren G. ^{[3
]}

Huang Y. ^{[3
]}

Gao M. ^{[1
]}

机构：

[1] Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology, Wuhan

[2] CRRC Qiqihar Rolling Stock Co., Ltd, Qiqihar

[3] Jiujiang Institute of Advanced Laser Technology, Jiujiang

来源：

Hanjie Xuebao/Transactions of the China Welding Institution | 2024年 / 45卷 / 05期

关键词：

fatigue properties; laser-arc hybrid welding; T-joint;

D O I：

10.12073/j.hjxb.20230613001

中图分类号：

学科分类号：

摘要：

To investigate the feasibility of laser-arc hybrid welding in bogie structures, the hybrid welding of 20mm-thick Q345E steel T-joints was carried out. The fatigue properties were assessed using both the single-point method and the staircase method. The findings reveal that, at the specified 5 million cycles, the median fatigue strength of the hybrid-welded T-joint stands at 148.3 MPa. Furthermore, the conditional fatigue strength at 2 million cycles is 181.5 MPa, representing a remarkable 39.6% increase compared to the corresponding arc-welded T-joint. Analysis of the fatigue crack morphology indicates that the fatigue crack originates at the root weld toe, with the instantaneous fracture region displaying a ductile fracture mode. The enhanced fatigue properties of the hybrid-welded T-joint can be attributed to the reduced stress concentration factor at the root weld toe and the finer weld microstructure composed of the intragranular ferrite. This prevents premature fatigue crack initiation and hinders fatigue crack propagation. © 2024 Harbin Research Institute of Welding. All rights reserved.

引用

页码：1 / 7

页数：6

共 16 条

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