Rare Earth Affected Tungsten Electrode Welding Property

To understand the impact of rare earth content on tungsten electrode welding property has significant for improving tungsten electrode welding performance. In the same production process, tungsten electrode with different rare earth content has different welding performance. As we all know, thorium tungsten electrodes have excellent welding performance, so as below we also compared rare earth tungsten electrode with thorium tungsten electrode.

Arc Starting Property
During experiment, the cathode is water cooled brass. Besides, the arc starting experiment starts form 30V and each interval increases by 1V no-load voltage. To carry out 30 times arc starting experiment for each voltage, the arc starting worked within 1 second is supposed to success and within 1 ~ 10 refers to arc starting lag behind, more than 10 seconds to arc which is failure. Learned form the experimental data shows that the rare earth tungsten electrode arc starting performance is better than thorium tungsten electrode. Rare earth tungsten electrode has low work function, so it has good arc performance. Doped with a variety of rare earth composite rare earth tungsten electrode arc starting property is superior to rare earth tungsten electrode doped with single rare earth oxide. Yttrium tungsten electrode high yttria content has better arc performance.

Anti-burning Performance
In experiment, the tungsten electrode links to the negative electrode, at 250A welding current arcing for 30 minutes. And then to use DP-100 optical analytical balance measured the electrode mass change before and after the experiment. From the experimental data shows that the mass of rare earth tungsten electrodes is higher than thorium tungsten electrode, namely, rare earth tungsten electrode has better anti-burning property than thorium tungsten electrode. Among different rare earth tungsten electrodes, yttrium tungsten electrode exhibits more excellent anti-burning property. When other conditions being equal, the lower work function on electrode surface is lower, the lower operating temperature, and anti-burning property is better. Rare earth tungsten electrode formed low work function active layer on the surface, so the anti-burning performance of the RE tungsten electrode is relatively good.

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