Slag inclusion
Mixed slag inclusions are unwanted nonmetallic residues trapped in the metal during welding. They can come from welding consumables or coatings and lead to loss of strength and corrosion.
Physical-chemical mechanism of action
Mixed slag inclusions are formed when nonmetallic residues are trapped in the metal during welding. These can come from welding aids such as paints or coatings and remain trapped in the microstructure.
Metallurgical relevance & risks in welding
These inclusions can significantly impair the mechanical properties of the weld metal. They lead to loss of strength, increase corrosion resistance, and can serve as sources of cracks. In addition, they can contaminate the structure and reduce hardness.
Workshop practice & action instructions
To minimize mixed slag inclusions, welding aids should be carefully removed. This can be done by mechanical removal or chemical cleaning. The weld should be thoroughly cleaned and inspected to ensure that no unwanted inclusions are present.