Abstract The welding quality of spot weldment is an important factor that significantly affects the strength, stiffness, safety, and other performance characteristics of vehicles. Therefore, quality control and fatigue life evaluation of spot weldment are necessary processes. This paper presents a method for determining the fatigue life of multi-lap spot weldment of a high strength steel sheet. In this method, the fatigue life is estimated using the lethargy coefficient, which is the total defect coefficient according to rupture stress and time obtained by the quasi static tensile-shear test. The DC potential drop method was used to check initiation and propagation of cracks in addition to the test. Also, in this study, we modified the lethargy coefficient by using the welding current. Furthermore, we define a specific lapping constant, which is a characteristic constant of 2 or 3 lap weldments. The fatigue life obtained by the fatigue estimate equation, which contains a specific lapping constant was compared and verified with an experimental value. Finally we analyzed the relation of lap number, welding current and fatigue life. This method can save processing time and cost for predicting the life cycle of a structure.


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    Title :

    Fatigue analysis for a multi-lap spot welded joint of high strength steel using quasi static tensile-shear test


    Contributors:
    Sin, S. R. (author) / Yang, S. M. (author) / Yu, H. S. (author) / Kim, C. W. (author) / Kang, H. Y. (author)


    Publication date :

    2008-02-01


    Size :

    6 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





    Fatigue analysis for a multi-lap spot welded joint of high strength steel using quasi static tensile-shear test

    Sin, S. R. / Yang, S. M. / Yu, H. S. et al. | British Library Online Contents | 2008


    Empirical Formula for Fatigue Strength of Singlle-Spot-Welded Joint Specimens under Tensile-Shear Repeated Load

    Abe, Hiroshi / Kataoka, Shigenori / Satoh, Tsugihiko | SAE Technical Papers | 1986



    Fatigue Behavior of Spot Welded High Strength Steel Joints

    Wilson, R. B. / Fine, T. E. | SAE Technical Papers | 1981