Shielding Gas Flow Separation Point
The flow separation point is where the shielding gas transitions from laminar to turbulent flow. If it occurs early, gas coverage can break down and contaminate the workpiece.
Physical-Chemical Mechanism of Action
The shielding gas flows in a laminar stream when it moves smoothly and orderly. At a certain velocity level or due to geometric disturbances (edges), the flow transitions to turbulent, where the gas moves chaotically.
Metallurgical Relevance & Welding Risks
An early flow separation point means the shielding gas no longer protects effectively. This can lead to atmospheric contamination of the workpieces and cause quality issues in the welding process. It also increases the risk of corrosion and unwanted chemical reactions.
Workshop Practice & Action Guidelines
To prevent the flow separation point, pay attention to proper gas flow and geometric rounding on the gas nozzle. A velocity of at least 10 m/s is recommended. For complex workpieces, the flow can be improved with additional valves or nozzle optimization.