Abstract
The microstructure and mechanical properties of the copper and steel bimetallic welded joint were analyzed. Research results show there was a friction interface transferring phenomenon in inertia radial friction welding (IRFW). A secondary friction interface (SFI) appeared in welded joints of H90 copper brass/D60 steel rod. The SFI showed an abnormal transferring phenomenon. The formation mechanism of the SFI was analyzed under the condition of H90 copper/D60 steel dissimilar metals in IRFW. A new model and formation mechanism were issued and used to explain the unusual transferring phenomenon and characteristic in the views of three gradients: temperature gradient, deformability gradient (large or super plastic deformability), and microstructure gradients. The microhardness and element diffusion also supported our viewpoints about the SFI transferring and provided proofs for the transferring mechanism.
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