中国激光, 2018, 45 (3): 0302002, 网络出版: 2018-03-20
填充焊丝对A7204铝合金光纤激光-VPTIG复合焊接头的影响 下载: 692次
Effects of Filler Wires on A7204 Aluminum Alloy Joint by Fiber Laser-VPTIG Hybrid Welding
激光技术 光纤激光 复合焊接 A7204铝合金 接头软化 laser technique fiber laser hybrid welding A7204 aluminum alloy joint softening
摘要
基于光纤激光-变极性钨极稀有气体保护电弧焊(VPTIG)复合焊技术,利用不同填充焊丝对A7204铝合金进行了焊接,分析了复合焊接接头的显微组织与力学性能,并研究了接头的软化行为及机制。结果表明,ER5087填充焊丝条件下的焊缝上部铸态组织最细小;自然时效90天后,三种填充焊丝条件下的接头力学性能相近,拉伸试样基本断裂于近母材侧的热影响区;三种填充焊丝条件的焊接接头在距熔合线1.6~2 mm处的热影响区硬度最高,而在距焊缝中心3~7 mm处的热影响区有明显的软化带;焊接热影响区存在明显的时效硬化区和再结晶软化区,且自然时效对热影响区软化具有明显影响。
Abstract
By using the hybrid welding technology of fiber-laser and VPTIG (variable-polarity tungsten inert gas arc welding), the A7204 aluminum alloys are welded with different filler wires. The microstructures and mechanical properties of these joints by this hybrid welding are analyzed, and the softening behavior and mechanism of these joints are also investigated. The results show that the upper part of the weld with ER5087 filler wires presents the finest microstructure with narrow dendrite arms. After the natural aging of 90 days, the mechanical properties of joints welded with three kinds of filler wires are similar, and the tensile specimens fracture basically in the heat-affected zone which is close to the base metal. The microhardness of these joints welded with three kinds of filler wires in the heat-affected zone, 1.6-2 mm away from the fusion line, is the highest, in contrast, the softening zone obviously occurs in the heat-affected zone, 3-7 mm away from the weld center. In the heat-affected zone, there exist the obvious aging hardening zone and recrystallization softening zone, and the natural aging has an obvious effect on the softening of heat-affected zone.
王灿, 吕俊霞, 张建超, 吴世凯. 填充焊丝对A7204铝合金光纤激光-VPTIG复合焊接头的影响[J]. 中国激光, 2018, 45(3): 0302002. Wang Can, Lü Junxia, Zhang Jianchao, Wu Shikai. Effects of Filler Wires on A7204 Aluminum Alloy Joint by Fiber Laser-VPTIG Hybrid Welding[J]. Chinese Journal of Lasers, 2018, 45(3): 0302002.