The types of tungsten needles can be classified according to application scenarios and needs. Here are several common tungsten needle types:
- Thoriated tungsten needle: This is a very stable tungsten needle and the most widely used tungsten needle. It contains 1-1.2% thorium oxide ThO2 and therefore has slight radioactive contamination. Thorium tungsten tungsten needles are often used in non-melting argon arc welding, including manual argon arc welding machines, automatic argon arc welding machines, automatic pipe welding machines, automatic tube plate welding machines, hot wire TIG welding machines, etc. The arc of this kind of tungsten needle is easier, the arc is more stable than pure tungsten needle or zirconium tungsten needle, it has higher current carrying capacity and longer service life.
- Pure tungsten needle: This is another common type of tungsten needle. It does not contain thorium and therefore has no radioactive contamination. Pure tungsten tungsten needles are typically used in applications requiring higher temperatures, such as plasma cutting and spraying.
- Cerium tungsten needle: Cerium tungsten needle is an environmentally friendly tungsten needle. It does not contain radioactive elements, so it is safer to use. Cerium-tungsten tungsten needles have strong chemical activity, which can better ignite the arc and improve welding efficiency.
- Zirconium tungsten needle: Zirconium tungsten needle is a high-strength, high-toughness tungsten needle. It has excellent mechanical properties and high-temperature performance. It is suitable for application scenarios such as heating elements of high-temperature furnaces that need to withstand high temperatures and high stress.
In addition, according to different shapes, tungsten needles can also be divided into round rod-shaped tungsten needles and pointed tungsten needles. The round rod-shaped tungsten needle has a slender structure and a metallic surface. It is often used as an electrode for argon arc welding. Tungsten needles with pointed tips are mainly used for instrument probes, such as digital four-probe testers.
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