Schlieren flow analysis
Shadow field flow analysis is an optical measuring method that makes density distributions in the shielding gas flow visible to detect turbulence and malfunctions.
Physical-Chemical Mechanism of Action
The shadowgraph flow analysis uses a light source and a detector to visualize density differences in the gas flow. The light rays are scattered by dense areas, which is displayed as a shadow pattern.
Metallurgical Relevance & Risks in Welding
This analysis helps in detecting air bubbles and turbulence in the gas flow, which can lead to uneven heat transfer. This can result in incomplete melting or lack of fusion in the weld.
Workshop Practice & Action Instructions
To effectively use shadowgraph flow analysis, the gas flow profile should be checked regularly. If anomalies appear in the shadow pattern, adjust the gas flows and velocities. An optimal gas flow leads to even heat transfer and improves weld quality.