摘要
In order to increase the absorption of laser energy and improve the weld appearance in laser welding of Al alloy, 1.8 mm- 6013 Al alloy plate was welded by activating flux CO2 laser welding. Activating flux includes oxide and fluoride, which was coated on the workpiece surface before welding. The experimental results show that the activating flux can effectively improve the absorption of CO2 laser energy and increase the amount of the molten base metal. The improvement on the absorption of laser energy by oxide activating flux is greater than that by fluoride activating flux or two-component activating flux, but the slag detachability made from both the single activating flux and two-activating flux is poor. The gas pore sensitivity with oxide activating flux is much higher than that with fluoride activating flux in CO2 laser welding of 6013 Al alloy.
为了提高铝合金对激光的吸收率,改善焊缝表面成形,对1.8mm厚的6013铝合金板进行活性剂CO2激光焊接。活性剂主要采用的是对激光具有较高吸收率的氧化物和氟化物,将其焊前预涂覆于铝合金板上,然后施焊。结果表明:活性剂在提高CO2激光吸收率,增加母材金属熔化量方面具有明显的效果;氧化物活性剂对促进激光能量吸收的效果要强于氟化物,但氧化物形成熔渣的脱渣性较氟化物熔渣的差;在氧化物活性焊接过程中,气孔敏感性比较大,而氟化物活性剂在焊接过程中很少出现气孔。
基金
supported by State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, China
