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When it comes to welding stainless steel, the choice of tungsten is crucial as it plays a significant role in the quality of the weld. Tungsten is used in the form of an electrode in Tungsten Inert Gas (TIG) welding, which is a popular method for welding stainless steel due to its precision and control.

The color of the tungsten electrode can vary and is often coded to indicate its composition and suitability for different welding applications. For DC TIG welding of stainless steel, the most suitable types of thoriated tungsten electrodes are those with a color code of RED, YELLOW, MAUVE, or ORANGE. These colors correspond to electrodes that have a certain percentage of thorium oxide added to the tungsten, which improves the electron emission and allows for a better arc stability.

The thoriated tungsten electrodes are classified by the American Welding Society (AWS) under the EWTH series. For instance, the 2% thoriated tungsten, which is commonly referred to as RED, is designated as AWS Class EWTH-2. This type of electrode is particularly popular for DC welding applications due to its performance characteristics.

When welding stainless steel, the thoriated tungsten electrodes are often the go-to choice because they provide a good balance of performance and cost. They are suitable for a range of applications including welding carbon steel, stainless steel, nickel alloys, and titanium. The addition of thorium oxide enhances the electron emission capability of the tungsten, which is essential for maintaining a stable arc during the welding process.

It's important to note that while thoriated tungsten electrodes are effective, they do contain thorium, which is considered a radioactive material. Therefore, safety precautions should be taken when handling these electrodes, including proper ventilation and personal protective equipment.

In summary, for DC TIG welding of stainless steel, one should opt for a thoriated tungsten electrode with a color code of RED, YELLOW, MAUVE, or ORANGE. These electrodes are AWS Class EWTH-2 and are well-suited for a variety of welding applications, including but not limited to stainless steel.

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THORIATED Tungsten Color Code RED, YELLOW, MAUVE or ORANGE, is best suited for DC Tig welding applications. 2% Thoriated, Red, AWS Class EWTH-2, DC welding applications. The most common type of electrode used today. Applications: carbon & stainless steel, nickel alloys and titanium.Jun 27, 2011read more >>