Surface Oxide Layer Removal Rate
The surface oxide layer removal rate describes how quickly oxide on the metal surface is removed by flux or reducing gases. A high rate is essential for a clean weld.
Physicochemical Mechanism of Action
The surface oxide removal rate refers to the speed at which oxide on the metal surface is removed via chemical reactions. This happens either through fluxes that bind oxygen or through reducing gases that convert the oxide into a less oxidized material.
Metallurgical Relevance & Welding Risks
If the removal rate is too low, oxides stay on the contact surface and contaminate the weld. This can lead to porosity, cracking, and poor joint strength. A high rate, on the other hand, ensures a clean contact surface and improves weld quality.
Workshop Practice & Instructions
To ensure an effective surface oxide removal rate, use fluxes or reducing gases when preparing the metal. For steels with high carbon content, it's especially important to prevent oxidation during welding. A typical removal rate is about 10-20 µm/min for liquids and 5-10 µm/min for gases.