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Effect of surface topography on mechanical properties of steel-polycarbonate joints by laser direct joining

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Abstract

Laser direct joining of steel (DP590) and thermoplastic polycarbonate (PC) is conducive to promoting the lightweighting of automobiles. In this paper, the optimal laser parameters of laser direct joining of DP590 and PC were determined. To improve the interfacial bonding strength of DP590-PC joints, a linearly arranged groove was fabricated on the DP590 surface by a fiber laser. The influence of groove direction and spacing on the ultimate shear force of the DP590-PC joints was investigated through lap-shear testing, and the test results showed that groove direction had little effect on the joint force, but groove spacing had a significant effect. When a groove spacing of 0.15 mm was selected, the joint force increased by 52.5%. The effect mechanism of surface topography on joint force was further analyzed by a cross-sectional view, which revealed that the existence of surface topography can increase interface contact area and form a mechanical interlocking structure between DP590 and PC. In addition, the interfacial heat transfer of the joint during laser joining is affected by the surface topography. When the ratio of surface topography reached 40%, the joint force almost reached the maximum. The reason is that the excessive proportion of surface topography results in high temperature on the PC side and forms excess voids, which inhibits the improvement of joint strength. Therefore, the desired force of DP590-PC joint can be obtained by fabricating surface topography on steel surface.

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Funding

The work is financially supported from the National Natural Science Foundation of China (No. 51805375).

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Authors and Affiliations

  1. School of Mechanical Engineering, Tongji University, Shanghai, 201804, China

    Bo Chen, Xiao Jiang, Junying Min, Chengcheng Sun, Yi Liu & Jianping Lin

  2. Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China

    Shanglu Yang

Authors
  1. Bo Chen
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  2. Xiao Jiang
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  3. Junying Min
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  5. Yi Liu
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Contributions

Bo Chen: methodology, formal analysis, writing – original draft. Xiao Jiang: investigation, data curation, visualization. Junying Min: project administration, supervision, writing – review and editing, funding acquisition. Chengcheng Sun: validation, writing – review and editing. Yi Liu: resources, writing – review and editing. Shanglu Yang: writing – review and editing. Jianping Lin: writing – review and editing.

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Correspondence to Junying Min.

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Chen, B., Jiang, X., Min, J. et al. Effect of surface topography on mechanical properties of steel-polycarbonate joints by laser direct joining. Weld World 66, 1811–1823 (2022). https://doi.org/10.1007/s40194-022-01344-y

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  • DOI: https://doi.org/10.1007/s40194-022-01344-y

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