Zirconium Tungsten Electrode
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- Published on Wednesday, 27 January 2016 09:01
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Zirconium tungsten electrodes are kind of rare earth tungsten electrodes which added zirconia (ZrO2) into tungsten-base electrode, produced by powder metallurgy. Its main component are 98 ~98.8% tungsten, 0.91~1.2% zirconia, 0.01~0.07% yttria and 0.01~0.02 cobalt. The tip color of zirconium tungsten electrodes are brown and white. When the doping amount of zirconia is 0.20 to 0.40 percent, the tip color is brown; when doping amount of zirconia is 0.70% to 0.90%, the tip color is white. Zirconium tungsten electrode welding performance lies between tungsten electrodes and thorium tungsten electrode, having good welding performance. In addition, it is mainly produced to improve the shortcoming of tungsten electrode which at high load welding conditions easily melts to contamination the workpiece. Because when zirconium tungsten electrode operates at high load currents, the ends of the electrodes can keep spherical shape thereby reducing tungsten infiltration phenomenon, and it has good corrosion resistance as well, so use a wide range than tungsten electrodes.
Zirconium tungsten electrode and pure tungsten electrode generally use in alternating current (AC), and not for direct current (DC), mainly as AC welding of magnesium aluminum and other alloys. At AC welding, zirconium tungsten electrode using ratio is higher than pure tungsten electrode, because during welding the arcing is better than pure tungsten electrodes and arc beam stability. Besides it has good current carrying capacity, good corrosion resistance and weldability. What’s more, it can prevent tungsten infiltration phenomenon and pollution, especially in the high load current conditions the superiority of it is not a substitute for the other electrode. Zirconium tungsten electrodes can also be used for high quality welding rays, mainly because the high quality welding ray has high requirements of tungsten pollution, and zirconium tungsten electrode under high load currents has little tungstenizing phenomenon, so zirconium tungsten electrodes replace tungsten electrode and other rare earth electrode widely use in high quality welding rays fields.
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