Thorium tungsten electrode has long been the most widely used electrode type in DC argon arc welding due to its excellent arc initiation performance and arc stability. However, thorium is radioactive and poses safety hazards when used and disposed of, prompting industry to look for safe and similar performance alternatives.
At present, the common alternatives to thorium tungsten electrodes are mainly cerium tungsten electrodes and lanthanum tungsten electrodes. Cerium tungsten electrodes doped with cerium oxide have good arcing properties, making them particularly suitable for low-current welding without the risk of radioactivity, making them ideal for many precision welding applications. Lanthanum tungsten electrode doped with lanthanum oxide, has excellent arc initiation performance and arc stability, has a long service life, and has relaxed operating environment requirements, making it a popular alternative in automated welding and high-strength welding.
In addition, rare earth tungsten electrodes are compounded with a variety of rare earth elements, which further improves the electrode performance, takes into account safety and durability, and has gradually become the first choice for high-end welding equipment. Overall, these non-radioactive tungsten electrode alternatives are gradually replacing thorium tungsten electrodes to meet the needs of modern industry for environmental protection and safety.
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