Tungsten electrodes of different colors represent differences in their doping elements and properties, and mixing them is generally not recommended. Each color of tungsten electrode has specific applicable scenarios and welding process requirements, such as pure tungsten electrode (green) suitable for AC welding aluminum alloy, thorium tungsten electrode (red) suitable for DC welding stainless steel, and lanthanum tungsten electrode (black or gold) is widely used in automated welding and DC welding. If different types of tungsten electrodes are mixed, it may lead to arc instability, degraded weld quality, and even affect the mechanical properties and appearance of the weld.
In addition, there are differences in arc starting voltage, thermal stability, and wear rate of different tungsten electrodes, which may lead to inconsistent head shape and affect arc concentration and heat input control. Therefore, in order to ensure the welding effect and process stability, the appropriate type of tungsten electrode should be selected according to the specific welding materials and process requirements, and mixed use should be avoided.
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