Nitrogen-deoxidation interaction

Physico-chemical mechanism of action

Nitrogen deoxidation interaction refers to the chemical binding of free nitrogen in the melt by aluminum- or titanium-based nitride formers. These materials react with nitrogen to form a more stable nitride that adheres to the metal surface.

Metallurgical relevance & welding risks

Using nitride formers reduces porosity in the weld because less free nitrogen is available to form pores. It also prevents strain aging by stabilizing the metal and improving its mechanical properties over the long term. Without this interaction, pores can form in the weld zone, which can lead to cracks, and the material can age over time and lose its toughness.

Shop practice & action guidelines

To successfully use nitrogen deoxidation interaction, nitride formers like aluminum or titanium must be used in the weld pool. The concentration of these materials should be precisely set depending on the metal and welding process used. Too high a concentration can alter the microstructure and impair mechanical properties, while too low a concentration reduces their effectiveness.