Cause of Slag Inclusion Defects

During the welding process, certain slag is generated from the welding electrode and steel plate, and some of this slag cannot be completely removed, resulting in some residue within the weld. This residue ultimately forms slag inclusion defects in welding, which are one of the more common defects in the welding process. Slag inclusions can be classified based on various criteria, each highlighting different causes of slag inclusion. During welding, the use of alkaline welding electrodes can easily produce oxides under high temperature conditions, especially when influenced by the welding current. Oxides in the welding electrode and oxides in the steel plate rapidly form and enter the weld gap with the weld pool. During the cooling of the metal, slag inclusion defects are prone to forming.