Tungsten electrode contamination caused by metal vapour from a base metal during a tungsten inert gas welding was investigated. The metal ions transported from the weld pool surface were deposited on the tungsten electrode surface during welding. The tungsten fraction of the electrode surface layer was decreased because the deposited metal vapour diffused inside the tungsten electrode. The melting point of the electrode surface layer was lowered, decreasing to the electrode operating temperature. Results show that the electrode melted and deformed. This electrode contamination was promoted when a larger amount of metal ions was transported to the electrode surface.

中文翻译：

---

钨极惰性气体保护焊过程中金属蒸气传输引起的电极污染

研究了钨极惰性气体保护焊接过程中由贱金属产生的金属蒸气引起的钨电极污染。在焊接过程中，从焊池表面传输的金属离子沉积在钨电极表面上。由于沉积的金属蒸气在钨电极内部扩散，因此降低了电极表面层的钨含量。电极表面层的熔点降低，降低到电极工作温度。结果表明电极熔化并变形。当大量的金属离子被运输到电极表面时，这种电极污染得到了促进。