The term "technical gases" describes all gases that have been prepared for technical applications. They meet a high level of purity, some of which are also described by technical standards, such as For example, DIN EN ISO 14175 (welding consumables).
A technical gas can consist of individual elements or a mixture of different elements. These gases or gas mixtures are generally obtained by process engineering plants. Examples of technical gases:
Forming gases such as H2 in N2 are said to generate reactions. Forming gases have a reducing effect on metal oxides and thus prevent oxidation. For example, they are used as a protective gas in the hot processing of metals (welding, soldering, rolling, etc.).
Packaging gases in food industry
H2 Leak test
In the helium leak test, the part to be checked is flooded with the light inert gas helium. A vacuum is created around the test object. A helium detector detects the lowest concentrations of helium, which could escape, for example, through the smallest cracks on the test part.
Technical gases are also often used as zero or calibration gas for measuring devices.