Novel technique of friction extrusion self-refilling for repairing keyhole of flat clinched joint

Zhang, Peng; Chen, Chao; Zhang, Chuanwei; Cao, Yang-feng; Li, Shuangjiang; Li, Fan; Jiang, Hong; Zhao, Shengdun

doi:10.1016/j.ijmecsci.2022.107658

Cited by 9 publications

(1 citation statement)

References 71 publications

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“…The multi-material design has attracted significant attention in the automotive industry to achieve the goal of reducing emissions and saving energy [1,2]. Due to its low density and high strength, aluminium alloys are increasingly being used alongside steel in the production of bodywork [3]. However, the fusion welding method traditionally used in the automotive industry has several problems when welding aluminium and steel, such as porosity defects and poor metallurgical compatibility [4].…”

Section: Introductionmentioning

confidence: 99%

Study on the microstructure and failure mechanisms for flat resistance element welding-bonding aluminium alloy/Q235 steel joints

Fei

Zhao

Zhang

et al. 2022

Science and Technology of Welding and Joining

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A novel method called flat resistance element welding-bonding (FREWB) is proposed to join aluminium alloy to Q235 steel. The microstructure and mechanical performance of FREWB and flat resistance element welding (FREW) were investigated. The microstructure of the nugget was lath martensite. The heat-affected zone of the rivet could be divided into two zones according to the microstructure: the upper-critical heat-affected zone (UCHAZ) and the inter-critical heat-affected zone (ICHAZ). The microstructure of UCHAZ consists of martensite, and the microstructure of ICHAZ consists of martensite and ferrite. The failure mechanisms of the FREW and FREWB joints were analysed. Moreover, an analytical model was established to predict the variation of critical nugget sizes, which provided a relatively good prediction.

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