摘要
2524铝合金是具有优异损伤容限的新型航空高强Al-Cu-Mg合金.采用高功率光纤激光器焊接1.6 mm厚2524铝合金,研究了填充5087焊丝情况下,激光功率、焊接速度和填丝速度对焊缝成形、热裂纹倾向和焊缝显微组织的影响,优化焊接工艺参数,考察接头静态拉伸性能.结果表明,采用填充材料后,焊缝柱状枝晶生长方向性明显减小、晶粒细化、晶界共晶增多、热裂纹倾向降低.当激光功率为2.5 kW,焊接速度为2 m/min,填丝速度为2 m/min时,可获得成形良好、无缺陷的焊缝,接头抗拉强度达到313~324 MPa,拉伸断裂于接头熔合线附近,断口处有大量韧窝,呈韧性断裂特征.
Type 2524 aluminum alloy is an Al-Cu-Mg alloy with high damage tolerance for aerospace applications. High power fiber laser welding of 1. 6 mm thick 2524 aluminum alloy sheets was conducted with 5087 aluminum alloy filler wire. The effects of laser power,welding speed and wire feeding speed on the weld appearance,solidification cracking susceptibility and microstructure were investigated. The microhardness and mechanical properties of the crack-free joints were tested. The results indicate that welding with 5087 aluminum alloy filler wire could shorten the columnar dendritic grains,refine the equiaxed dendritic grains,increase the quantity of grain boundary and reduce the hot cracking susceptibility. A defect-free joint with good surface appearance was obtained with optimized welding parameters: 2. 5 kW laser power,2 m / min welding speed and 2 m / min wire feeding speed. The tensile strength of the joints was 313-324 MPa,and ductile fracture with plenty of dimples occurred around the weld fusion line.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2014年第4期24-28,114,共6页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(51175008)
关键词
光纤激光焊接
2524高强铝合金
5087焊丝
焊接工艺
组织性能
fiber laser welding
2524 high strength aluminum alloy
5087 filler wire
welding process
microstructure property
