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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 drawbacks of repairing and routine repairing of the aluminum alloy structure of the military aircraft, a laser welding technique was used to repair the damaged 2Al2 structure. Laser welding of the homemade Al-5Mg-0.3Sc with 2Al2 was studied. , Scanning electron microscopy study of the weld and the matrix metallographic structure, tensile strength and other properties and welding specimens and 2Al2 riveted specimen tensile strength. The results show that the grain size of Al-5Mg-0.3Sc alloy and 2Al2 alloy butt weld is obviously refined, the tensile strength is comparable to the rivet strength of 2Al2 plate, and the laser butt welding of Al-5Mg-0.3Sc plate and 2Al2 plate Structure can replace the traditional 2Al2 plate riveting repair structure.