Slag
Slag is a solidified chemical compound on the weld surface, formed by melting electrode coverings or fluxes. It protects the weld pool from corrosion and forms a barrier-friendly surface.
Physical-Chemical Working Mechanism
Slag forms when electrode coatings or fluxes melt in the weld pool. It consists of chemical compounds that settle during the heat process and cling to the surface of the weld pool.
Metallurgical Relevance & Risks in Welding
Slag protects the weld pool from corrosion and keeps the metal from coming into contact with the environment. It forms a barrier-friendly surface that prevents the diffusion of oxygen and other corrosive substances. However, wrong slag or too much slag can block the weld pool and affect penetration, which can lead to poorer weld quality.
Workshop Practice & Action Instructions
Make sure the weld pool is cleaned regularly to remove slag. Use suitable chemicals or mechanical methods for cleaning. When choosing electrodes and fluxes, make sure they have low slag-forming properties to optimally protect the weld pool.