What is the minimum purity percentage required for oxygen produced by air liquefaction used in welding?

The minimum purity percentage required for oxygen produced by air liquefaction and used in welding is critical to ensure optimal performance and safety during the welding process. Oxygen with a purity of at least 99.5% is necessary because it affects the combustion process of the welding torch. Higher purity levels allow for a more efficient oxidation reaction, resulting in cleaner and stronger welds.

Impurities in oxygen can lead to undesirable reactions during welding, such as the formation of oxides that may weaken the joint or produce toxic fumes. Thus, maintaining a purity level of 99.5% or higher minimizes the risk of defects in the weld and enhances the overall integrity of the weldment. This is especially important in industries where high structural integrity is crucial, such as aerospace and automotive sectors.

The specified purity level ensures that the oxygen is suitable for high-temperature applications, contributing to the effectiveness and reliability of the welding operation.