激光-双MIG电弧复合焊耦合机制及熔滴过渡研究

发布时间：2017-12-27 03:18

本文关键词：激光-双MIG电弧复合焊耦合机制及熔滴过渡研究　出处：《中国激光》2016年06期 　论文类型：期刊论文

【摘要】：激光-双MIG(熔化极稀有气体保护)电弧复合焊具有熔深大、熔敷效率高、焊接质量好等特点,然而由于其耦合机理复杂,给应用带来了一定的困难。基于电磁场理论提出了激光与双电弧耦合机制,当激光光致等离子体中间部位的电子受到两个电弧产生的洛伦兹力和电场力相差较大时,等离子体两端的电子分布会不均匀,这使得一端电弧发生弯曲,沿焊丝轴向的促进力减小,熔滴过渡困难。当激光光致等离子体中间部位的电子受到两个电弧产生的洛伦兹力和电场力大致平衡时,电子能够比较均匀地分布在等离子体的两端,吸引稳定电弧,利于熔滴过渡。采用高速摄影系统和电信号采集系统研究激光-双MIG电弧复合焊接过程,结果表明:当工艺参数不合适时,电弧发生弯曲,导致不稳定的大颗粒过渡和短路过渡;当工艺参数合适时,两个电弧根部被固定在激光光致等离子体的下部,形成稳定的射流过渡。
[Abstract]:Laser double MIG (rare metal gas arc protection) arc hybrid welding has the characteristics of deep penetration, high deposition efficiency and good welding quality. However, because of its complex coupling mechanism, it brings some difficulties to application. The electromagnetic field theory is proposed based on the coupling mechanism of laser and arc, when the electronic light induced by laser plasma middle part two arc generated by the Lorenz force and electric field force is quite large, both ends of the plasma electron distribution would not be uniform, which makes the bent end of the arc, the axial force decreases along the wire to promote, droplet transfer difficulties. When the electron in the middle part of the laser induced plasma is roughly balanced by the Lorenz force and the electric field force generated by the two arcs, the electrons can be distributed evenly at both ends of the plasma, attracting stable arcs, which is favorable for droplet transfer. By using the high-speed photography system and signal acquisition system of double MIG laser arc hybrid welding process, the results show that when the process parameters are not appropriate, the arc bending, resulting in the instability of the large particle transfer and short circuiting transfer; when the appropriate process parameters, the two arc root is fixed at the lower part of the laser induced plasma the formation of stable transition, jet.
【作者单位】：石家庄铁道大学材料科学与工程学院河北省交通工程材料重点实验室;上海交通大学上海市激光制造与材料改性重点实验室;
【基金】：河北省自然科学基金(E2013210030) 河北省高等学校科学技术研究指导项目(Z2012010)
【分类号】：TG40
【正文快照】： 0602005-11引言近十年来,激光电弧复合焊接技术发展迅速,广泛应用于船舶、石油管道、汽车、航空等工业领域中[1-4]。该技术所采用的复合形式主要是激光与单一电弧耦合,如CO2/YAG激光与钨极稀有气体保护电弧、CO2/YAG激光与熔化极稀有气体保护/熔化极活性气体保护(MIG/MAG)电弧

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