Interfacial Microstructure and Formation of Direct Laser Welded CFRP/Ti-6Al-4V Joint

Joining fiber reinforced polyether ether ketone resin matrix composite (PEEK-CFRP) with Ti-6Al-4V titanium alloy to form a structure is promising manufacturing process. Huge difference of material properties the biggies challenge join them. Continuous laser welding process conducted in this experiment two materials. In study, joints under different speeds were obtained. Mechanical and microstructures observed, interfacial structures tested. The results showed that fixed joint could be As speed decreased, tensile shear first increased then decreased. force reached maximum value 36.8 N/mm at 10 mm/s. quality observably affected by speed. formation bubbles, cracks, anchor effect interface main factors affecting mechanical property joint. Thus, adhesion failure was for CFRP fracture. Ti, Al some other elements had been diffused across interface, resulting intermediate transition layer. result EDS, X-ray XPS test indicated CTi0.42V1.58 phase formed, Ti react oxygen carbon TiO2, TiO TiC, forming stable structure.