Effect of heat input on characteristics of TC4-CFRTP laser welding joints with PA6/epoxy resin interlayer

•The strength of the TC4-CFRTP joint was improved by adding PA6/epoxy interlayer.•The addition of interlayer increases the binding area of TC4 and CFRTP.•The joining mechanism and fracture mechanism of the joint was revealed.•The temperature of the joint interface during welding was measured. Ti-6Al...

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Bibliographic Details
Published in:Optics and laser technology 2024-07, Vol.174, p.110560, Article 110560
Main Authors: Li, Lixin, Chuan, Jialing, Xu, Shen, Huang, Cheng, Luo, Yulin, Deng, Ben, Bai, Wei, Jie Kong, Hao, Chen, Rong
Format: Article
Language:English
Subjects:
Epoxy
Interlayer
Laser welding
PA6
TC4-CFRTP
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Summary:•The strength of the TC4-CFRTP joint was improved by adding PA6/epoxy interlayer.•The addition of interlayer increases the binding area of TC4 and CFRTP.•The joining mechanism and fracture mechanism of the joint was revealed.•The temperature of the joint interface during welding was measured. Ti-6Al-4 V titanium alloy (TC4) and carbon fiber reinforced resin matrix composites (CFRTP) were successfully connected by laser welding after adding PA6 or epoxy as the interlayer. Experiments and simulations were performed to clarify the influence of the interlayers on the joint characteristics, including the strength, interfacial microstructure, failure behavior and joining mechanism under different laser heat inputs (LHI). The results showed that with the increasing heat inputs, the joint strength first increased and then decreased in accordance with the degree of melting/decomposition of the PA6/epoxy interlayer. When the interlayer was PA6, the highest tensile strength of 3428 N was generated under 38.5 J/mm. When the interlayer was epoxy, the highest tensile strength of 3855 N was generated under 45 J/mm. For each interlayer, there was an optimal LHI, when the LHI was lower than the optimal value, the interlayer was not completely melted; Otherwise, the high temperature at the interface can easily damage the CFRTP. All joints regardless of the types of interlayer demonstrated three fracture modes. Both the PA6 and epoxy interlayers can improve the heat distribution on surface of the CFRTP, leading to an increase in melting zone of the resins and thus a joint strength improvement.
ISSN:0030-3992
1879-2545
DOI:10.1016/j.optlastec.2024.110560