What is the impact of poor inter-run cleaning in welding?

• A. It decreases weld strength
• B. It can lead to slag inclusion
• C. It enhances appearance
• D. Both A and B

Answer: (D)

Poor inter-run cleaning in welding significantly affects the quality and integrity of the weld. When welders do not properly clean the surface between weld passes, contamination can occur. This contamination typically includes residues such as slag, oil, or rust, which can adversely affect the welding process and the final properties of the weld.

The reduction in weld strength occurs because contaminants can create weak points in the weld joint. If residues are present, they may not bond properly with the molten weld pool, leading to a potential decrease in the overall strength of the welded joint. Furthermore, when the weld pool solidifies around these contaminants, it can cause internal voids or weaknesses within the material.

Additionally, slag inclusion is another significant concern associated with inadequate inter-run cleaning. Slag is a by-product of the welding process, and if the previous weld pass is not cleaned, there's a risk that the slag may become trapped within the subsequent weld bead. This can create defects that may compromise the structural integrity of the weld, further reducing its strength and potentially leading to premature failure under stress.

Both factors—decreased weld strength and the possibility of slag inclusion—underscore the importance of thorough cleaning between weld runs. Therefore, the choice indicating both A and B accurately reflects the impact of poor