Oxygen as Trace Element
Oxygen forms oxide inclusions in the melt that reduce the toughness and durability of the material.
Physicochemical Mechanism of Action
Oxygen reacts in the molten pool with the metals, forming chemical compounds known as oxides. These oxides can appear as microscopic inclusions in the melt.
Metallurgical Relevance & Risks in Welding
These oxide inclusions can reduce the mechanical toughness of the material because they act as stress raisers. They can also lead to corrosion and shorten the service life of components. Furthermore, they negatively affect the structure and weld quality.
Workshop Practice & Action Instructions
To minimize oxygen as a trace element, it's important to ensure a clean melting environment. This can be achieved by using deoxidizing agents such as silicon or potassium fluoride. The melt should be cleaned regularly and the molten pool well covered to avoid oxygen access.