Abstract
• PEEK-CFRTP and Titanium alloy as the lightweight materials are used in this research. • Laser welding technology as the heat source to join the dissimilar materials. • Focused Ion beam is used to prepare TEM samples of the joint interface. • Joint formation mechanism is carried out by phase analysis and reaction process. Ti-6Al-4V and Joining fiber reinforced polyether ether ketone resin matrix composite (PEEK-CFRTP) were joined directly by laser welding process. The joint microstructures and phases were analyzed. Results showed that the shear strength could reach 56.3kN/mm. Bubbles and cracks were found in joints, which impaired the strength of joint. The 'Anchor-shaped' structures at interface were also formed to strengthen the joint as the melted resin flowed into surface gap of titanium alloy. The microstructures showed that TiOF2, TiC, VC and the solution (Ti,V)C were found to form the joint. Finally, the joint formation mechanism was released according to the phased generated and joint microstructures.
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