HWCYL20 Tungsten Electrode Welding Performance

With the development of science and technology and the improvement of human environmental awareness in recent years, people develop a variety of new electrode materials to replace thoriated tungsten electrodes. In the 1960s, the Soviet Union started to develop new materials. China in 1973 developed the W-CeO2 electrode. The late 1980s, Japan launched a series of rare earth tungsten electrode including a W-Y2O3, W-CeO2 and W-La2O3 and so on. The composite rare earth tungsten electrode is introduced in the 90s by adding a variety of rare earth oxide to obtain, which has excellent welding performance.

The component of HWCYL20 tungsten electrode includes 0.4wt% La2O3,0.4wt% CeO2 and 1.2wtY2O3 and tungsten oxide. Mixed these three kinds of rare earth nitrate solution with blue tungsten oxide, after dried and reduction, can obtain the ternary rare earth tungsten powder. Through the pressing, sintering, forging, annealing, drawing and grinding can finally obtain HWCYL20 electrodes with different diameters.

Analyzed SEM photograph of ternary rare earth tungsten powder found the Fisher particle size of powder is about 1.7um, having smaller particle size. And this is mainly because rare earth elements beneficial to inhibit tungsten grain growth. Tungsten electrode after sintering, rare earth oxide particles as the second phase uniformly distributes in the tungsten matrix. Rare earth oxide particle size is about 1 ~ 2um. After welding rare earth oxide particle size has no significant change.

Compare Ø1.6mm HWCYL20 electrode and thorium tungsten electrode welding performance found, HWCYL20 after welding there is dendrites projecting showed on the surface of the electrode tip, which great damage arcing and welding performance of electrode. Found at high powder lens there was sunken on the surface of electrode tip. And after welding thorium tungsten electrode tip was blunt, which seriously affects the arc performance of the electrodes, having severe burning. In addition, the electronic work function of HWCYL20 electrode is 2.76eV and burning rate is small than thorium tungsten electrode. It can be seen, HWCYL20 electrode having good welding performance.

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