【摘要】 以6156铝合金为主要研究对象,对比了其激光填丝焊与自熔焊各自特点,探讨了焊缝表面成形、焊缝熔宽的影响因素及接头的抗拉强度与疲劳强度变化规律.结果表明,功率在1 800 W左右,焊接速度在2～3.5 mm/min,送丝速度在2～3.5 mm/min范围能获得较好的焊缝表面成形;接头焊后不经热处理抗拉强度可达314.3 MPa,为母材强度的81.3%,且有良好的抗疲劳性能;铝合金激光焊具有焊接速度高、焊缝成形美观、焊接参数范围广的特点,是一种良好的焊接方式.更多还原

【Abstract】 The laser beam welding characteristics of 6156 aluminum butt joint with and without filling wire are investigated.The factors which influence the weld appearance and weld width are analyzed.The variety rule of tensile and fatigue strength are discussed.The results show that the appearance of the weld joint with filler metal is better than the one without filler metal.The maximum weld gap tolerance of the weld joint with filler metal increases to 0.7 mm.The strength of weld joint without heat treatment is 314.3 MPa which is 81.3% of base metal.Laser welding of aluminum is a favorable weld technology with the characteristics of high speed,fine weld appearance and wide weldability.更多还原