Welding process and fatigue strength analysis of 6005A aluminum profiles for high-speed rail carriages

6005A aluminum profile welding process optimization: Friction stir welding (FSW) is used with a rotation speed of 1200 r/min and a welding speed of 700 mm/min. The shoulder offset is controlled within ±1.8 mm, ensuring a weld strength of 200 ± 10 MPa and avoiding lack of fusion defects.

6005A aluminum profile fatigue strength improvement: By adjusting heat input (e.g., laser welding with an incident angle ≤ 15°), softening in the heat-affected zone is reduced, ensuring the joint life under a load of 55 MPa meets the standard, with the fracture location away from the fusion line.

Structural design adaptation: By optimizing the 6005A aluminum profile cross-section (e.g., hollow structures) and combining it with post-weld aging treatment (T6), the hardness distribution is "W"-shaped, improving fatigue performance by 30%.