Whether tungsten electrodes need to be sharpened depends on the specific process and requirements of the welding. Sharpening the tungsten electrode is a common preparatory step in argon arc welding, with the primary purpose of obtaining a more stable and concentrated arc, thereby improving the quality of the weld. Here’s a breakdown:
The role of sharpening
The sharpened tungsten electrode head forms a slender pointed conical shape, which helps to concentrate the arc, making the arc more stable and concentrated, and the heat is more concentrated in the weld area, improving the precision and penetration depth of welding. The sharp electrode head also reduces arc swing, making it suitable for thin sheets and fine welds.
Sharpening angles for different welding modes
Direct current welding (DC): It is usually necessary to grind the tungsten electrode into a sharp tapered shape, with sharp angles generally between 10°~30°, which is convenient for forming a thin and stable arc.
AC welding (AC): Especially when welding aluminum and magnesium alloys, the tungsten electrode head mostly maintains a spherical state, and it is not recommended to grind the tip, which helps to stabilize the start and transmission of the arc.
Sharpening method
Use a specialized grinding wheel or grinder to grind the tungsten electrode to avoid overheating and contaminating the electrode surface, maintaining the cleanliness and integrity of the electrode.
The situation of not sharpening
Some specific types of tungsten electrodes (such as pure tungsten electrodes for AC welding) require the end to be naturally spherical without sharpening, as this is conducive to the stability of the AC arc.
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