Microstructure of Cold Pressing-dispersal Composite Welding Joints of Cu/Al Alloy

T2 Cu and 2A50 Al alloy were welded by cold pressing-dispersal composite connection technology.The joint was analyzed by means of SEM,EDS,XRD and so on.The results show that 2 mm dissimilar metal welded seam formed in the T2/2A50 alloy interface after 200 MPa cold pressing+(515-525) ℃×90 min heat dispersal and 100 MPa hot pressing+(515-525) ℃×90 min heat dispersal.Content of Cu is 56.91% and content of Al is 43.09% in the welded seam area.Content of CuAl2 is 56.4% in the welded seam area,which is higher than 2A50 Al alloy(7.6%).Furthermore,there is no elementary substance of Cu.