Active gas fraction
The active gas content indicates the percentage of reactive gases like carbon dioxide or oxygen in an argon mixed gas. This affects penetration geometry and arc stability.
Physical-Chemical Mechanism of Action
The active gas content refers to the percentage of reactive gases such as carbon dioxide (CO2) or oxygen (O2) in an argon-based mixed gas. These gases work during the welding process and influence how the arc forms and what materials it transfers.
Metallurgical Relevance & Welding Risks
Too high an active gas content can lead to irregular penetration patterns and impair arc stability. This can result in inconsistent weld bead profiles and possibly cracks or distortion. Conversely, too low an active gas content can cause the arc to wander and affect weld quality.
Workshop Practice & Working Instructions
For optimal weld quality, the active gas content should be set according to the material and the desired penetration profile. For low-carbon steel, a low active gas content (about 1-3%) is recommended, while for high-carbon steels or special welding processes, a higher content (about 5-10%) may be necessary. The exact setting should always be done according to the manufacturer's instructions and by checking the weld quality.