Tungsten Electrode Color Coding
Tungsten electrode color codes indicate which additives and current types are used in tungsten welding processes. For example: red for zirconium addition for hardfacing, blue for titanium addition for fine welding.
Physical-Chemical Working Mechanism
Color codes on tungsten electrodes serve as visual indicators for the additive and the current type in the welding process. Each color corresponds to a specific additive that deposits on the electrode tip during electrolytic welding.
Metallurgical Relevance & Welding Risks
Wrong color coding can lead to unwanted additives, affecting the microstructure and properties of the weld metal. For example, a wrong cobalt additive in hardfacing can lead to increased hardness and lower ductility, while a missing titanium additive in fine welding can result in insufficient weld volume and poorer mechanical properties.
Workshop Practice & Instructions
Make sure the correct color coding is used on the electrode to ensure the desired additive and current type. Regularly check the color and integrity of the electrodes. For instance, use a red electrode for cobalt additive in hardfacing and a blue electrode for titanium additive in fine welding.