Tungsten Electrode Doped With Two Rare Earth Oxides Properties

Tungsten electrode doped with two rare earth oxides (binary composite tungsten electrode) usually produces by powder metallurgy method and binary composite tungsten electrodes include W-La₂O₃-Y₂O₃, W-La₂O₃-CeO₂, and W-Y₂O₃-CeO₂. Comparing composite tungsten electrode’s physical property of welding arc with tungsten electrode doped with one rare earth oxides and thorium tungsten electrode can well understand composite electrode performance. After comparison, binary composite rare earth tungsten electrode properties are better than thorium tungsten electrode and tungsten electrode doped with single rare earth oxide.

To add rare earth nitrate solution into WO₃ powders, after two times reduction can obtain alloy powder, and then after mixed, pressed, sintered and plastic working and other processes can obtain composite tungsten electrode, tungsten electrode doped with single rare earth oxide and thorium tungsten electrode.

In the experiment, we use direct current electrode negative (DCEN) argon tungsten arc welding method, with high-frequency arc, and electrode diameter is 2.4mm, electrode diameter is 2.4mm. Besides, electrode tip cone angle is 45 ° and power equipment used ZS500 type silicon rectifier welder, GNP-300 welder control box and 100KVA line regulator.

By comparison, the composite rare earth tungsten electrode has better thermal electron emission properties than tungsten electrode doped with rare earth oxide and thorium tungsten electrode. Besides, it has good arc stability, anti-burning performance, and strong anti-burning performance. During welding, it has long operation time and better working stability.

In the binary composite electrodes, W-La-Ce electrode has lower arc voltage and at low current conditions, it has good arc stability. W-Y-Ce electrode composite electrode has best arcing and anti-burning properties. Besides, it has good arc stability and has large thermal power. W-La-Y has similar arc performance with W-La-Ce electrode and W-Y-Ce electrode, but it has large thermal power is larger, so large current anti-burning properties is lower than W-La-Ce electrode and W-Y-Ce electrode.

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