← Glossary

Deoxidizer Silicon

Silicon reacts with oxygen in the weld pool and forms silicates, which promotes deoxidation. It prevents porosity and increases the strength and scale resistance of the steel.

Physicochemical mechanism of action

Silicon reacts with free oxygen in the molten steel to form silicate complexes. These compounds are stable and prevent porosity.

Metallurgical relevance & welding risks

Too high silicon content (above 0.40%) can cause brittleness in the weld and increase susceptibility to hot cracking. Too low content can lead to poor mechanical properties and porosity.

Workshop practice & instructions

Use silicon in the amounts recommended by the steel manufacturer. Regularly monitor the deoxidation level in the weld pool and adjust the silicon amount to achieve optimal porosity-free and mechanical properties.

MetallurgieSchweißtechnik

AI Transparency (EU AI Act): Created on the basis of our own many years of practical experience in welding technology, with the help of AI, and reviewed editorially.

© 2026 Welder-World. All content is for training and continuing education and does not replace a certified welding procedure specification.