激光填丝焊对熔池动态行为及焊缝成形的影响

发布时间：2018-02-17 02:16

本文关键词： 激光技术激光焊接激光填丝焊熔池 SiC粒子示踪法　出处：《中国激光》2017年11期 　论文类型：期刊论文

【摘要】：通过SiC颗粒示踪法获得了焊丝填充对熔池表面流动的影响规律,分析了不同的焊接工艺、焊丝填送模式和送丝角度对熔池表面波动行为及焊缝成形的影响。结果表明,在激光自熔焊过程中,熔池表面液态金属向后方及熔池另一侧流动,熔池表面波动较剧烈,焊缝表面出现凹陷缺陷;在激光填丝焊过程中,熔池表面金属全部表现为从前向后的快速流动,熔池表面波动相对稳定,焊缝表面成形良好。在激光填丝焊过程中,焊丝的过渡模式对熔池表面稳定性有显著影响,降低送丝角度有利于获得稳定的液桥过渡及减少焊缝气孔缺陷。
[Abstract]:The effect of wire filling on the surface flow of molten pool was obtained by SiC particle tracer method. The effects of different welding process, wire feeding mode and wire feeding angle on the surface fluctuation behavior and weld formation were analyzed. During laser self-fusion welding, the liquid metal on the surface of the molten pool flows to the rear and the other side of the weld pool, the surface of the pool fluctuates sharply, and the surface of the weld appears sunken defects. All the metals on the surface of the molten pool show a rapid forward to backward flow, the fluctuation of the surface of the pool is relatively stable, and the weld surface is well formed. In the process of laser wire filling welding, the transition mode of the welding wire has a significant effect on the surface stability of the weld pool. Reducing wire feeding angle is beneficial to obtain stable liquid bridge transition and reduce weld porosity.
【作者单位】：华北水利水电大学机械学院;哈尔滨工业大学先进焊接与连接国家重点实验室;
【基金】：河南省自然科学基金(162300410191) 河南省高等学校重点科研项目(17A430021) 华北水利水电大学高层次人才科研启动基金(201705006)
【分类号】：TG456.7

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