Tungsten electrodes are widely used in argon arc welding due to their extremely high melting point, but the actual performance of different types of tungsten electrodes varies slightly due to different doped elements. The pure tungsten electrode has the highest melting point, about 3410°C, which is also the melting point of the tungsten material itself, ensuring the electrode’s extremely strong heat resistance and stability in high-temperature arcs.
Tungsten electrodes doped with thorium, cerium, lanthanum, zirconium or rare earth oxides have a reduced melting point due to the addition of alloy components, but generally remain above 3000°C. The melting point of thorium tungsten electrode is slightly lower than that of pure tungsten, but its excellent electron emission properties and arc stability make it excellent in DC welding. The melting points of cerium tungsten and lanthanum tungsten electrodes are similar, and due to the doping of rare earth elements, they have better arcing performance and ablation resistance. Zirconium tungsten electrodes have a slightly lower melting point but are widely used due to their good AC welding arc spherical properties. Rare earth tungsten electrodes combine the advantages of a variety of rare earth elements, with high melting points and mechanical strength, suitable for high-end welding needs.
Although there are slight differences in melting points, all types of tungsten electrodes have extremely high heat resistance and can work stably in high-temperature arcing environments, ensuring weld quality and electrode life.
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