Formation mechanism of direct laser welding joint between CFRTP and Ti-6Al-4V

摘要

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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