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付娟, 赵勇, 邹家生, 贾占君, 贺宇翔. 铝合金非熔化极直流正接氦弧焊氧化膜撕裂机理[J]. 焊接学报, 2021, 42(12): 87-90. DOI: 10.12073/j.hjxb.20201120001
引用本文: 付娟, 赵勇, 邹家生, 贾占君, 贺宇翔. 铝合金非熔化极直流正接氦弧焊氧化膜撕裂机理[J]. 焊接学报, 2021, 42(12): 87-90. DOI: 10.12073/j.hjxb.20201120001
FU Juan, ZHAO Yong, ZOU Jiasheng, JIA Zhanjun, HE Yuxiang. Mechanism of the oxidation film tearing by DCEN-TIG helium welding of aluminum[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2021, 42(12): 87-90. DOI: 10.12073/j.hjxb.20201120001
Citation: FU Juan, ZHAO Yong, ZOU Jiasheng, JIA Zhanjun, HE Yuxiang. Mechanism of the oxidation film tearing by DCEN-TIG helium welding of aluminum[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2021, 42(12): 87-90. DOI: 10.12073/j.hjxb.20201120001

铝合金非熔化极直流正接氦弧焊氧化膜撕裂机理

Mechanism of the oxidation film tearing by DCEN-TIG helium welding of aluminum

  • 摘要: 采用高速摄影观察了不同气体流量下铝合金非熔化极直流正接氦弧焊焊接过程中电弧的形态及氧化膜撕裂过程. 观察测量结果表明,在试验参数范围内氦气流量的增加减弱了氧化膜的撕裂程度,但提升了焊缝深宽比及电弧能量效率. 氦弧焊阳极产热功率的提升削弱了氧化膜之间的化学键强度,产生了氧化膜撕裂现象. 在静力学平衡方程基础上推导得出了熔池液面与电极所在平面交线的微分方程,解释了熔池液面下凹程度随氦气流量增加而增加的原因,同时熔池中心指向熔池边缘表面张力也随气体流量增加而减小,两种因素共同作用使氧化膜撕裂程度随气体流量增加而减弱.

     

    Abstract: Oxidation film tearing under different helium flow during DCEN-TIG welding of aluminum was observed via high-speed photography. The results showed that helium flow reduced the oxidation film tearing, but it increased the deep-to-width ratio of the weld pool and arc energy efficiency. The enhanced power of the positive pole of helium welding weakened the chemical bond of the oxidation film and leaded to the tearing of oxidation film. Based on the static equilibrium equation, differential equation of the intersection line between the surface of molten pool and the electrode plane was derived, which explained that the depression of molten pool increased with the increase of helium flow, and the surface tension from the center to the edge of the molten pool also decreased with the increase of helium flow. Both factors work together to make the tearing degree of oxidation film decreased with the increase of helium flow.

     

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