SUS304不锈钢点焊与胶焊接头的疲劳强度分析

发布时间：2018-05-30 03:19

本文选题：SUS不锈钢 + 点焊接头　；参考：《材料导报》2017年16期

【摘要】：通过拉剪实验测定1.5mm厚SUS304不锈钢点焊接头、胶焊接头的抗拉强度,并开展疲劳实验,获得不同应力水平下两种接头的疲劳寿命,得到两种接头的载荷-寿命曲线;借助扫描电镜分析接头疲劳失效过程。结果表明:当焊接电流为10.0kA、焊接时间为80ms、电极压力为0.5 MPa时,能获得较好的胶焊接头。在此焊接参数下,点焊接头、未固化胶焊接头和固化胶焊接头的平均失效载荷分别为12 825.5N、10 345.6N、10 022.9N;在疲劳实验载荷-寿命曲线的有限寿命区内,SUS304不锈钢胶焊接头的疲劳强度均大于点焊接头;点焊接头和胶焊接头的疲劳失效形式主要由母材眉状裂纹失效和界面撕裂失效两种形式组成;胶焊接头的疲劳失效过程中,首先是胶层粘接失效,随后疲劳裂纹从板间内表面热影响区边缘萌生,沿板厚与板宽方向扩展直至发生疲劳失效。
[Abstract]:The tensile strength of 1.5mm thick SUS304 stainless steel spot welded joints and adhesive welded joints were measured by tensile and shear tests. Fatigue tests were carried out to obtain the fatigue life and load-life curves of the two joints under different stress levels. The fatigue failure process of joints was analyzed by SEM. The results show that when the welding current is 10.0 Ka, the welding time is 80 Ms and the electrode pressure is 0.5 MPa, a good adhesive welding joint can be obtained. With this welding parameter, the spot welded joint, The average failure loads of uncured joints and cured joints are 12 825. 5 N / 10 345.6 N / 10 022. 9 N respectively. The fatigue strength of SUS304 stainless steel joints is higher than that of spot welded joints in the limited life range of fatigue test load-life curve. The fatigue failure forms of spot welding joint and adhesive welding joint are mainly composed of two forms: base metal eyebrow crack failure and interface tearing failure. Then the fatigue crack sprouted from the edge of the heat affected zone on the inner surface of the plate and propagated along the direction of the thickness and width of the plate until the fatigue failure occurred.
【作者单位】：昆明理工大学机电工程学院;
【基金】：国家自然科学基金(51565022;51565023)
【分类号】：TG407;TG498

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