Fatigue Strength Analysis of Spot Weld and Weld-bonded Joint for SUS304 Stainless Steel

被引：0
|
作者：
Xiao Z. [1 ]
Zeng K. [1 ]
He X. [1 ]
Xing B. [1 ]
Zhang L. [1 ]
Sun X. [1 ]
机构：
[1] Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming
来源：
Zeng, Kai (kmzk201109@163.com) | 2017年 / Cailiao Daobaoshe/ Materials Review卷 / 31期
关键词：
Failure mode; Fatigue life; Spot welds; SUS304 stainless steel; Weld-bonded joint;
D O I：
10.11896/j.issn.1005-023X.2017.016.023
中图分类号：
学科分类号：
摘要：
Tensile shear test of spot welds and weld-bonded joints of 1.5 mm SUS304 austenitic stainless steel was made to acquire their tensile strength. Fatigue test of spot welds and weld-bonded joints was carried out under different levels of stresses, and two kinds of joint's load-life curves were obtained. Scanning electron microscopy was used to explore the fatigue failure mechanism. Results showed that the relatively good parameters for weld-bonded joints were welding current 10.0 kA, welding time 80 ms, and welding pressure 0.5 MPa. Under this welding parameters, the tensile strength of spot welds, uncured weld-bonded and cured weld-bonded joints were 12 825.5 N, 10 345.6 N and 10 022.9 N, respectively. Weld-bonded joints had a higher fatigue strength than spot welds. Fatigue failure modes of spot welds and weld-bonded joints were mainly composed of eyebrow failure and interfacial fracture mode. In the process of fatigue failure of weld-bonded joints, the rubber failure occurred first, then fatigue crack initiated from the heat affected zone edge between the inner surface and extended in the direction of thickness and width. © 2017, Materials Review Magazine. All right reserved.
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页码：112 / 116
页数：4
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