gassblanding

Gas blending, or gassblanding, is the process of combining two or more gases to achieve a prescribed composition and total pressure. It is used in a range of sectors, including welding and metallurgy with shielding gas mixtures (for example argon, helium, and carbon dioxide blends), calibration gas production for analytical instruments, semiconductor manufacturing, medical and laboratory applications, and process control where inert or reactive atmospheres are required.

Blending is typically performed with gas blending systems that control the flow of each component. Methods include static blending, which uses fixed geometry and static mixer elements to promote mixing, and dynamic blending, where gases mix in a moving stream or mixing chamber. Gas flows are usually set with mass flow controllers or precision regulators to achieve the desired concentration, pressure, and total flow. Quality checks using gas analyzers verify the final composition.

Quality and safety considerations include traceability and certification of gas mixtures, often with a certificate of analysis. In medical, laboratory, or calibration contexts, regulatory requirements may apply. Risks include incorrect concentrations, contamination, moisture ingress, and leaks. Proper labeling, handling, and storage, as well as regular equipment maintenance and calibration, are essential to ensure reliability and safety.