védgázok

Védgázok, also known as shielding gases, are inert or semi-inert gases used in various industrial processes, particularly in welding and metal fabrication. Their primary function is to protect the molten weld pool and the surrounding hot metal from atmospheric contamination. Oxygen and nitrogen from the air can react with the molten metal, leading to porosity, reduced strength, and other defects in the weld.

The most common védgázok include argon and helium, which are noble gases and therefore highly unreactive. Mixtures of argon with other gases, such as carbon dioxide or oxygen, are also frequently used. Carbon dioxide is a more active gas and can contribute to deeper penetration in some welding applications, but it also produces more spatter. The choice of védgáz or gas mixture depends on the type of metal being welded, the welding process employed, and the desired properties of the finished weld.

In gas metal arc welding (GMAW), also known as MIG welding, and gas tungsten arc welding (GTAW), also known as TIG welding, the védgáz flows through the welding torch to displace the atmospheric air. This creates a protective envelope around the arc and the molten metal. In other applications, such as plasma cutting or electron beam welding, védgázok may be used to prevent oxidation or contamination of the workpiece or the equipment. The effective use of védgázok is crucial for achieving high-quality, defect-free welds and for ensuring the integrity of metal components.