Tungsten electrodes can be used for DC welding, and DC welding is a very common form of current in argon arc welding.
In DC argon arc welding, the tungsten electrode is generally used as the negative electrode (cathode), while the workpiece is used as the positive electrode (anode). This polarity arrangement facilitates arc stabilization, reducing electrode consumption while allowing for more concentrated heat input in the welding area, making it suitable for welding thick plates and a wide range of metal materials.
Different types of tungsten electrodes also have differences in their performance in DC welding, such as:
Thorium tungsten electrode and lanthanum tungsten electrode have excellent arcing performance and good stability in DC welding, and are suitable for large current welding.
Cerium tungsten electrodes are also commonly used in DC welding, especially suitable for low current or fine welding.
It should be noted that DC welding has high requirements for electrode selection and polarity, and the correct selection of electrode materials and polarities can improve welding quality and electrode life.
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