Relationship between Key Process Parameters and Stress Field of Aviation Aluminum Alloy Welded by Laser Beam
Laser welding process parameters not only affect the residual stress of aluminum alloy structural parts, but also affect their service performance. It is of great significance to explore the relationship between parameters and stress field to improve the quality of welded structural parts. The laser welding of 7075-t7351 aluminum alloy plate with a thickness of 5 mm is numerically simulated by using the cone heat source model. The influences of welding speed and laser energy on the welding residual stress field is analyzed. The accuracy of the simulated results is verified by experiments, and the relationship between the laser welding process parameters and stress field of 7075 aluminum alloy is revealed. The results show that the residual stress increases with the increase of welding speed, but when the welding speed exceeds a certain value, the stress in a weld nugget zone does not increase, and the maximum stress gradually expands to both sides. In addition, the larger the laser energy is, the smaller the residual stress is, but the distribution area of maximum residual stress gradually expands. The best process window for laser welding of 7075 aluminum alloy was obtained:welding speed is 5～7 mm/s, and laser welding energy is 70～100 J/mm. The above research has a certain value and significance in shortening the cycle of laser welding process optimization of 7075 aluminum alloy and reducing its cost.
Aluminum alloylaser weldingstress fieldwelding speedwelding energy
李光祖、王江涛、谢利、卢雅林、张永康、胡可军、C. M. CASCIOLA
展开 >
江苏理工学院 材料工程学院,江苏 常州213001
广东工业大学 机械工程学院,广东 广州511400
School of Aeronautics and Mechanical Engineering, Sapienza University of Rome,Sapienza,Italy
万方数据
维普
