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<p>In the present research, SPCC and CFRP sheets were joined by coaxial one-side resistance spot welding (COS-RSW) with assistance of DLAMP approach as the first try. The mechanical performance of welded joint was analyzed by single lap shear (SLS) test. The cross-section and fracture surface were subjected to multi-scale characterizations to understand the joining and fracture mechanism. The results showed that the DLAMP process generated micro-scale grooves especially bridge structures to the metal surface, which introduced 3D mechanical interlocking between dissimilar materials. The dimension of joining zone presented a positive relationship with welding time. Two kinds of fracture modes were distinguished from SLS test, the interfacial fracture occurred with short welding time, small joining zone, and low joining strength, which altered into the matrix fracture under long welding time, large joining zone, and high bear capacity. The maximum SLS load can reach about 5348 ± 282 N with 2.5-s welding time. For the interfacial fracture, the CFRP experienced significant tensile deformation at the edge of joining zone, while it presented a cleavage feature in the center, which was induced by the interfacial force situation under beading effect. Moreover, the matrix fracture can be subdivided into outside and inside types according to the relative position with overlap region, which indicated the different crack initiation positions.</p>

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Joining and fracture mechanisms of the coaxial one-side resistance spot welding between SPCC and CFRP assisted by DLAMP approach

  • 期刊论文

  • 发表日期：

    2025年10月2日

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  • Sendong Ren,
  • Hao Chen,
  • Yihao Shen,
  • Ninshu Ma,
  • Shuhei Saeki,
  • Yoshiaki Iwamoto,
  • Jianguo Yang

摘要

In the present research, SPCC and CFRP sheets were joined by coaxial one-side resistance spot welding (COS-RSW) with assistance of DLAMP approach as the first try. The mechanical performance of welded joint was analyzed by single lap shear (SLS) test. The cross-section and fracture surface were subjected to multi-scale characterizations to understand the joining and fracture mechanism. The results showed that the DLAMP process generated micro-scale grooves especially bridge structures to the metal surface, which introduced 3D mechanical interlocking between dissimilar materials. The dimension of joining zone presented a positive relationship with welding time. Two kinds of fracture modes were distinguished from SLS test, the interfacial fracture occurred with short welding time, small joining zone, and low joining strength, which altered into the matrix fracture under long welding time, large joining zone, and high bear capacity. The maximum SLS load can reach about 5348 ± 282 N with 2.5-s welding time. For the interfacial fracture, the CFRP experienced significant tensile deformation at the edge of joining zone, while it presented a cleavage feature in the center, which was induced by the interfacial force situation under beading effect. Moreover, the matrix fracture can be subdivided into outside and inside types according to the relative position with overlap region, which indicated the different crack initiation positions.