What is the primary purpose of removing slag from a weld?

Removing slag from a weld is vital for ensuring the integrity and strength of the weld. Slag is a byproduct that forms on the surface of the weld during the welding process, and if left in place, it can negatively affect the quality of the weld.

When slag is present, it can trap impurities, create weak points, and even lead to defects such as porosity and inclusions within the weld. These defects can compromise the strength and durability of the welded joint, potentially leading to structural failures under load or stress. Therefore, thorough removal of slag is necessary to expose the solid weld metal and allow for proper examination and testing of the weld.

While other reasons, such as improving aesthetics or preparing for painting, may be practical considerations, the primary concern is always the mechanical properties and overall performance of the weld. Ensuring that the weld is free from slag is essential for maintaining its strength and structural integrity.