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Influence of process parameters on forming quality of Cu-Fe joints by laser shock hole-clinching

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Abstract

Laser shock hole-clinching is a novel mechanical joining process in which the shock wave pressure induced by a high-energy pulsed laser is employed as a punch. This process is quite suitable for the joining of two dissimilar materials with significant differences in plasticity and strength. However, the effect of key process parameters on the forming quality of joints by laser shock hole-clinching is less concerned. In this study, the influence of laser power density, spacer height, number of laser pulse, and initial grain size of metal foils on the forming quality of Cu-Fe joints was experimentally investigated. The characteristics of interlock value and thinning rate distribution under various process parameters were systematically examined. It is revealed that laser shock hole-clinching process can be divided into the confined bulging and interlock formation stages. Based upon the examination of substandard joints, the defects in laser shock hole-clinching process are classified which contains no interlock, nonuniform interlock, bottom and neck fracture. It is found that the thinnest position of joints locates at the region in contact with the upper corner of the joining partner II in which extensive plastic deformation occurs related to the force acting during clinching process. The interlock value increases significantly as the enlargement of initial grain size, whereas the deviation also becomes larger due to the inhomogeneous plastic deformation for the metal foil with coarse grains. Moreover, the ratio of spacer height to the thickness of the joining partner II affects the thinning rate distribution and interlock value of joints. The spacer height equaling to the thickness of the joining partner II is recommended within the given parameters.

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Acknowledgments

This work is supported by the National Natural Science Foundation of China (No. 51205232), Natural Science Foundation of Shandong Province (No. ZR2017BEE006), and the Fundamental Research Funds of Shandong University (2018JC042).

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Authors and Affiliations

  1. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, 17923 Jingshi Road, Jinan, 250061, People’s Republic of China

    Chao Zheng, Yiliang Zhang, Guoqun Zhao & Zhong Ji

  2. Shandong Zongde Electromechanical Equipment Co., Ltd. 693 Jiyan Road, Jinan, 250117, People’s Republic of China

    Yantao Sun

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  1. Chao Zheng
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  2. Yiliang Zhang
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  3. Guoqun Zhao
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Correspondence to Chao Zheng.

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Zheng, C., Zhang, Y., Zhao, G. et al. Influence of process parameters on forming quality of Cu-Fe joints by laser shock hole-clinching. Int J Adv Manuf Technol 110, 887–898 (2020). https://doi.org/10.1007/s00170-020-05915-5

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