When welding stainless steel, the most suitable are thorium tungsten electrodes (red) and lanthanum tungsten electrodes (black/gold). Thorium tungsten electrodes are doped with a small amount of radioactive thorium elements, which have excellent arcing performance and excellent arc stability, and can provide long-lasting and stable arcing in DC argon arc welding, which is very suitable for welding metals such as stainless steel and carbon steel. Thorium tungsten electrodes are widely used in traditional welding due to their high welding quality, uniform penetration depth, and beautiful weld seams.
Although lanthanum tungsten electrodes do not contain radioactive elements, they also have good arc initiation performance and arc stability, as well as ablation resistance and long service life. It is widely used in automated welding equipment, effectively reducing welding defects and improving production efficiency. With the increasing awareness of environmental protection and safety, lanthanum tungsten electrodes are gradually becoming the mainstream choice to replace thorium tungsten electrodes.
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