Compared with pointed tungsten needles, round rod tungsten needles are more suitable for the role of argon arc welding electrode materials. Although the two are almost the same in terms of physical and chemical properties, the choice of application field is very different. Pointed tungsten needles are more commonly used as instrument probes, while round rod tungsten needles are more suitable for electrodes for argon arc welding.
Tungsten needles, a long, slender tungsten product, whether made of pure tungsten or tungsten alloy, exhibit impressive properties. Its high melting point, low vapor pressure, excellent high-temperature strength and excellent creep resistance make it stable in high-temperature environments. In addition, tungsten needles have a high modulus of elasticity, low coefficient of thermal expansion and excellent electrical and thermal conductivity, making them the leading electrode materials. What's more, tungsten needles also have good corrosion resistance and can maintain their original characteristics in various harsh environments.
When the tungsten needle is used as the electrode, the stability of the arc performance is greatly improved, so that the welding effect of TIG welding is better. The tungsten needle electrode is not only less susceptible to melting and burning, but also effectively prevents reaction with other chemicals, thus ensuring stability and reliability during the welding process.
TIG welding, as a welding technique that uses argon as a shielding gas, has a wide range of applications. Whether it is non-ferrous metals and alloy steels that are prone to oxidation, or root welding, pipe welding and even sheet welding, which are susceptible to oxidation, or double-sided welding, TIG welding can easily cope with it. With its unique advantages, this technology occupies a pivotal position in the field of welding.
The advantages of TIG welding technology are numerous. First of all, argon protection can effectively isolate the adverse effects of air on the arc and the weld pool, thus ensuring the stability of the welding process. Secondly, the arc combustion of argon arc welding is stable and the heat is concentrated, which makes the welding production efficiency high, the heat affected zone is small, and the risk of weldment stress, deformation and cracks is reduced. In addition, the electrode loss is small, the arc length is easy to control, and there is no need to use flux or coating layer, which facilitates mechanized and automated welding. Finally, TIG welding is not limited by the position of the weldment, and can achieve full-position welding, which greatly improves the flexibility and convenience of welding.
However, TIG welding technology also has some shortcomings. First of all, due to the large heat-affected area, the workpiece may suffer from deformation, cracking, abrasion, scratches, or insufficient adhesion after repair. Secondly, it is difficult to weld metals with low melting points and easy evaporation, such as lead, tin, zinc, etc. In addition, during the welding process, it may pose a certain threat to human health, and it is necessary to pay attention to safety precautions. Nevertheless, through rational operation and strict safety management, TIG welding technology is still able to play its unique advantages in many fields.