Impeding effect of bubbles on metal transfer in underwater wet FCAW

Impeding effect of bubbles on metal transfer in underwater wet FCAW
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水下湿式FCAW中气泡对金属转移的阻碍作用

DOI:
10.1016/j.jmapro.2019.08.013
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发表时间:
2019-09
影响因子:
6.2
通讯作者:
Wu Chuansong
Wu Chuansong
中科院分区:
工程技术2区
文献类型:
--
作者:
Yang Qingyuan;Han Yanfei;Jia Chuanbao;Wu Junfei;Dong Shengfa;Wu Chuansong

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针对水下湿法焊接复杂的物理过程,激光和镝灯两种背景光源与高速摄像头相结合,实现金属转移、气泡演变和电弧行为的同步视觉传感。研究了不同电弧电压条件下熔滴和气泡的动态变化。详细描述了它们的交互关系。从气泡阻碍金属转移的角度出发,分析了低电弧电压条件下熔滴直径大、转移频率低的原因。气泡分离阶段颈部的气流阻力(FL)最大,极大地影响金属转移过程的稳定性。当液滴位于颈部上方时,很容易被分离的气泡带走,形成飞溅。同时,远离焊丝轴线上升的气泡很容易造成熔滴偏离焊丝。
Aiming at the complicated physical process of underwater wet welding, two background light sources, laser and dysprosium lamp, are combined with high-speed camera to realize synchronous visual sensing of metal transfer, bubble evolution and arc behaviors. The dynamic changes of droplets and bubbles under different arc voltage conditions are investigated. Their interaction relationships are described in detail. From the perspective of the bubble impeding the metal transfer, the reason for the large droplet diameter and low transfer frequency under low arc voltage conditions is analyzed. The gas flow drag force (FL) is the largest at the neck of the bubble separation stage, which greatly affects the stability of the metal transfer process. When the droplet is located above the neck, it is easy to be carried away by separated bubbles to form a spatter. At the same time, the bubbles rising away from the axis of the wire can easily cause the droplet to deviate from the wire.
考虑气泡、熔滴和电弧相互作用的湿式 FCAW 飞溅损失综合分析 - 第 2 部分:可视化
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DOI: --
发表时间: 2016
期刊: --
影响因子: --
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