Al-Mg-Sc与2Al2激光对焊工艺

Technology of Laser Welding on Al-Mg-Sc and 2Al2

针对目前军用飞机铝合金结构损伤抢修及日常维修技术存在的弊端,提出采用激光焊接技术修复损伤的2Al2结构件;研究了自制的Al-5Mg-0.3Sc与2Al2的激光对焊;通过金相显微镜、扫描电镜等研究了焊缝及基体金相组织、抗拉强度等性能及焊接试样与2Al2铆接试样抗拉强度。研究表明,Al-5Mg-0.3Sc合金与2Al2合金激光对焊焊缝晶粒明显细化,抗拉强度与2Al2板材的铆接强度相当,Al-5Mg-0.3Sc板材与2Al2板材的激光对焊焊接结构可以替代传统的2Al2板材的铆接修理结构。

Aiming at the disadvantages of the present techniques for repairing the damages of aluminum alloy aircraft structure, laser welding technique was proposed for repairing the damages of 2A12 alloy structure. Laser welding neck of Al- 5Mg-0. 3Sc alloy and 2A12 alloy was investigated. Through metallographic microscope and scanning electronic microscope, the properties such as metallurgical structure, tensile strength of the welding seam and the matrix alloy, tensile strength contrast to rivet specimen were studied. The experimental results show that the grain of the welded joint between 2A12 and Al-5Mg 0.3Sc is obviously refined, and tensile strengths of welded joint and riveted structure of 2A12 are equivalent. Laser welding neck structure of Al-5Mg-0. 3Se alloy and 2A12 can replace riveted repair structure of 2A12.