There are two main categories of tungsten needles:
1. Shape classification: According to the shape, tungsten needles can 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.
2. Composition classification: According to the composition, tungsten needles can be divided into pure tungsten needles and tungsten-lanthanum alloy needles. Pure tungsten needles are made of pure tungsten, while tungsten-lanthanum alloy needles are composed of tungsten and lanthanum elements. They have the characteristics of high melting point, high hardness, low conductivity, etc., and are often used to make electrode materials.
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