Porosity control of 1420 Al-Li alloy by dual-beam laser welding
Porosity control of 1420 Al-Li alloy by dual-beam laser welding
复制标题
DOI：
--
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
X. Rongshi
中科院分区：
文献类型：
--
作者：
X. Rongshi
采用DC 035连续CO2激光器，在TEM 00模式下，输出功率达3 500 W，对1420 Al-Li合金进行了双相渗控气孔的实验研究。结果表明，焊缝表面氧化膜对气孔的影响比背面氧化膜大当激光焊接是以光束的形式在板材表面上进行时，激光对接焊接时，焊缝气孔与焊缝背面氧化膜的敏感性和焊缝背面的形成有着密切的关系。通过试验研究，获得了减少焊缝气孔、提高焊缝质量的最佳激光焊接工艺，并对激光对接焊接接头的抗拉强度进行了试验研究。结果表明，激光对接焊接接头的抗拉强度与焊缝背面氧化膜的敏感性和焊缝背面的形成密切相关结果表明，接头的平均抗拉强度可达336.1MPa，相当于基体合金的87.5MPa。
As a precondition of laser welding,the plate of Al-Li alloy wasn′ t treated before welding.A DC035 CW CO2 laser,in the TEM00 mode,with output up to 3 500 W,was employed to experimentally study the porosity control of 1420 Al-Li alloy by dual-beam laser welding.The experimental results show that the influence from the surface oxide film on the porosity in weld is deeper than that from the backside one when the laser welding is in the form of beam on the surface of plate.However,welding porosity has a distinct connection with the sensibility of backside oxide film and the backside formation in the weld when the butt joint laser welding is carried out.The optimized laser welding techniques were achieved experimentally to decrease the porosity in weld and increase the weld qualities.The tensile strength of welded joints of butt joint laser welding was experimentally tested too.The data indicate that the average tensile strength of the joints could reach up to 336.1 MPa,which is equal to 87.5﹪ of the substrate alloy.