保护气体对光纤激光焊接5A90温度场分布特征的影响

发布时间：2018-06-22 03:34

本文选题：光纤激光焊接 + A铝锂合金　；参考：《机械工程学报》2017年16期

【摘要】：基于红外热像测量技术,通过对不同保护气体时,光纤激光焊接5A90铝锂合金过程的温度场研究,获得了如下结论:改变焊接速度的对比试验表明,保护气体对光纤激光焊接5A90温度场特征及其演变规律影响很大,且在不同焊接速度下,其影响规律也略有不同,但是总体而言,氦气作为保护气体,会使得小孔与熔池更加趋于稳定,小孔中心及小孔后端温度更低。改变激光功率的对比试验表明,氦气保护时,对正面焊缝温度场分布几乎无影响,但是在氩气保护时,影响却较大,其小孔中心特征值温度均值增加158℃,熔池长度的差异也很大。结果表明,这两种保护气体下激光能量的吸收、熔池的流动等有所不同,也表明改变激光功率和改变焊接速度,即使热输入相同,但是焊缝的热历程却有所不同。
[Abstract]:Based on the infrared thermal image measurement technology, the following conclusion is obtained through the study of the temperature field of 5A90 Al Li alloy by optical fiber laser welding with different protective gases. The following conclusion is obtained: the contrast test of the change of welding speed shows that the protective gas has a great influence on the temperature field characteristics and the variation law of the 5A90 welding of the fiber laser welding, and at different welding speed, it has a great influence on the temperature field of the optical fiber laser welding. The influence rules are also slightly different, but in general, the helium gas as a protective gas will make the hole and pool more stable, the center of the hole and the back end of the hole are lower. The contrast test of the laser power shows that the temperature field distribution of the weld seam is almost no influence when the helium gas protection is protected, but the effect is larger when the argon gas is protected. The mean value of the central characteristic temperature of the small holes is increased by 158 degrees C, and the difference in the length of the molten pool is also great. The results show that the absorption of laser energy and the flow of the molten pool under the two kinds of protective gases are different, and it also shows that the laser power and the welding speed are changed, even the heat input is the same, but the heat course of the weld is different.
【作者单位】：北京航空制造工程研究所高能束流加工技术重点实验室;
【分类号】：TG456.7

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