有氧条件下氩弧焊钨电极表面的烧蚀

Effect of Oxygen Contamination on Erosion of Tungsten Electrode in GTA Welding

摘要:

研究了在有氧条件下钨极氩弧焊的钨电极表面的烧蚀。研究结果表明，有氧条件下钨电极的钨基体烧蚀大大增加，主要原因是在一定温度范围内发生了氧和钨的反应；添加氧化钍的烧蚀主要是由于氧化钍的熔化和蒸发，采用纳米尺寸氧化钍的电极，氧化钍的烧蚀明显减轻，有助于提高钨电极的使用寿命。采用纳米氧化物添加钨电极以及保证保护惰性气体的纯度和流量可以降低钨电极的烧蚀，保证焊接质量。

Abstract:

The erosion of tungsten electrode in GTA (Tungsten-inert-Gas Arc) welding under the protection of argon with a little of oxygen contamination have been investigated. Results show that the erosion of tungsten increases greatly if a little of oxygen is add in argon gas because tungsten on the surface of electrode reacts with oxygen to form tungsten oxide. Melting and evaporation of thoria were the major reasons for the erosion of thoria in electrode. To ensure the purity grade and flow rate of shielding inert gas, to use tungsten electrode activated with nanosized thoria are two better ways to decrease the erosion rate of electrode.