Research of low-power pulsed laser welding of stainless steel with activating fluxes
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摘要: 为了研究活性焊接技术对低功率脉冲激光焊焊缝熔深增加的可行性,提高脉冲激光焊的焊接效率和降低焊接成本,采用低功率脉冲活性激光焊接方法,就TiO2,SiO2,Cr2O3,CaF2和NaF5种活性剂对SUS304不锈钢板焊缝熔深的影响进行了理论分析和试验验证,取得了焊缝熔深、深宽比及熔宽变化的数据。结果表明,活性剂对焊缝熔深均有不同程度的影响,其中TiO2和SiO2分别使熔深增加38.290%,17.175%;在焊缝深宽比方面,Cr2O3,TiO2,SiO2活性剂均使深宽比有不同程度的增加,而氟化物则对深宽比没有明显增加效果;同时,活性剂的存在不仅提高了激光的吸收率,还改变了熔池流动状态,使得焊缝中的显微组织发生变化。这一结果对于进一步探讨活性剂在激光焊接技术中的实际应用是有帮助的。Abstract: To improve the welding efficiency and reduce cost, the possibility of the penetration improvement on the welding joints by low-power pulsed laser with activating fluxes was studied. Based on the research of low-power pulsed laser welding of SUS304 stainless steel with five activating fluxes (TiO2, SiO2,Cr2O3, CaF2, NaF), the effect of the fluxes on the penetration of joints, as well as the mechanism of penetration improvement, was studied, and the relevant data was received. The results show that the penetration can be changed with all the activating fluxes, among which TiO2 and SiO2 can deepen the penetration by 38.290% and 17.175% respectively. Meanwhile the depth/width ratios are improved in different degrees by Cr2O3, TiO2 and SiO2, however the fluoride has little effect on this ratio. The existence of activating fluxes not only improves the absorption rate of laser power, but also changes the convection of the welding pool, which makes the microstructures within the welding vary. The result is helpful for the further application of the activating fluxes in the laser technique.
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Keywords:
- laser technique /
- penetration improvement /
- welding /
- activating flux
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