Comparison of Composite Rare Earth Tungsten Electrode and Thorium Tungsten Electrode
- Details
- Category: Tungsten Information
- Published on Wednesday, 13 July 2016 18:27
Thorium tungsten electrode has best welding performance, but its radioactive contamination will release in powder metallurgy process and grinding process, which great limits its application. The manufacturer has developed different rare earth electrodes as an alternative to thorium tungsten electrode and cerium tungsten electrode and lanthanum tungsten electrode has better performance among other rare earth electrodes. Comparing composite rare earth tungsten electrode and thorium tungsten electrode can better find excellent performance of composite rare earth electrode, but also improve their applications.
1. Arcing and arc stability: composite rare earth tungsten electrode and thorium tungsten electrode arcing 30 times under same conditions and the success rate of arcing is 100%, indicating both electrodes have excellent arcing performance in commercial welding machine, and stable.
2. Burning rate: Burning rate is an important feature to measure the welding performance of the electrode. Compared burning rate found composite rare earth tungsten electrode has low burning rate, indicating that it has longer working life than thorium tungsten electrode.
3. Current static characteristic curve: to compare the current static characteristic curve can find in the same welding current, composite electrode voltage bearing is significantly lower than thorium tungsten electrode, indicating composite electrode has better arc stability than thorium tungsten electrode. Current static characteristic curve is an important measure factor of welding performance and from this we can find composite electrode has better welding performance.
4. Work function: to compare the work function of these two electrodes found the composite electrode at 1300 ℃ the effective work function is 2.76eV and thorium tungsten electrode effective work function is 3.08eV. The work function of the composite electrode is lower than thorium tungsten electrode, so the electron emission capability of it is lower than thorium tungsten electrode.
According to the above four welding performance index comparison, the overall welding performance of multiple composite rare earth tungsten electrode is better than thorium tungsten electrode.
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