Cut edge oxidation layer
The oxide layer on the cut edge is a thin, chemically transformed layer on the cut surface of metals, formed by oxygen. It must be removed before further processing steps.
Physico-chemical mechanism of action
In oxygen-based cutting processes, the free metal reacts with the oxygen and forms a thin oxide layer on the cut edges. This layer consists of metal oxides that protect the surface but also impair weldability.
Metallurgical relevance & risks in welding
The oxide layer can lead to wear and corrosion if not removed. It increases the stress between the metals and can lead to poor weld joints. Moreover, it can affect the microstructure and reduce the mechanical properties of the material.
Workshop practice & action instructions
Before welding or coating metals, the cut edges must be thoroughly cleaned. This can be done by mechanical polishing, chemical cleaning agents, or a catalyst solution. A thin, smooth surface is essential for a sound and strong weld.