Investigation of transient metal vapour transport processes in helium arc welding by imaging spectroscopy
Investigation of transient metal vapour transport processes in helium arc welding by imaging spectroscopy
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通过成像光谱研究氦弧焊中的瞬态金属蒸气传输过程
DOI：
10.1088/1361-6463/ab9ce4
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Anthony B. Murphy
中科院分区：
文献类型：
--
作者：
Keigo Tanaka;Masaya Shigeta;Manabu Tanaka;Anthony B. Murphy
为了了解电弧等离子体中金属蒸气的瞬态输运机制，对氦电弧等离子体在纯金属上的燃烧进行了成像光谱研究。通过图像处理和Abel反演，将测量图像转换为电弧等离子体中心截面处的光谱强度分布。根据金属蒸气的扩散系数讨论了电弧等离子体中金属蒸气的瞬态输运过程。从熔池表面产生的金属蒸气在几秒钟内被输送到电弧等离子体中并到达钨电极附近的区域。随着时间的推移，熔池表面附近、电极附近和中间区域的金属蒸气光谱强度逐渐增加。与此相反，他我的光谱强度是弱的，他我的分布收缩向中心的弧。这是因为氦弧等离子体被来自金属蒸气的强辐射冷却。对于在纯铬上燃烧的电弧，铬离子在约40秒后到达电弧中心。相比之下，在纯铁上，铁离子没有到达电弧的中心。这是因为纯铬上的氦电弧等离子体被冷却到铬的电场和普通扩散系数最大的温度，而纯铁上的等离子体的温度仍然很高。两个因素促成了这一点;铁的沸点较高，这降低了铁蒸气的浓度，以及铁的辐射发射系数较低。
In order to understand the transient transport mechanisms of metal vapour in an arc plasma, imaging spectroscopy was performed for helium arc plasmas burning on pure metals. The measured images were converted into the spectral intensity distributions at the central cross-section of the arc plasma by image processing and Abel inversion. The transient transport process of metal vapours inside the arc plasma are discussed in terms of the diffusion coefficients of metal vapour. The metal vapour generated from the weld pool surface was transported into the arc plasma and to the region near the tungsten electrode within a few seconds. As time passed, the metal vapour spectral intensities gradually increased near the weld pool surface, near the electrode and in the intermediate region. In contrast, the He I spectral intensity was weak and the He I distribution shrunk toward the centre of the arc. This is because the helium arc plasma was cooled by the strong radiation from metal vapour. For an arc burning on pure chromium, chromium ions reached to centre of the arc after about 40 s. In contrast, on pure iron, iron ions did not reach to the centre of the arc. This is because the helium arc plasma on pure chromium was cooled to a temperature at which the electric field and ordinary diffusion coefficients of chromium are largest, whereas the temperature of the plasma on pure iron remained high. Two factors contributed to this; the higher boiling point of iron, which reduces the iron vapour concentration, and the lower radiative emission coefficient of iron.
TIG 焊接中金属蒸气行为的可视化
DOI：
10.2207/qjjws.30.164
发表时间：
2012
期刊：
影响因子：
--
作者：
Manabu Tanaka;Y. Tsujimura
通讯作者：
Y. Tsujimura