What can happen if oxides become a contaminant in the welding process?

When oxides become a contaminant in the welding process, they can significantly weaken the weld. This occurs because oxides create an imperfection in the weld joint that interferes with the fusion of the base metals. In GTAW, a clean surface is critical for achieving a strong bond between the filler material and the workpiece. The presence of oxides can inhibit this bonding, leading to porous or weak welds that do not meet the required strength and integrity standards.

Impurities like oxides can lead to issues such as inclusions or insufficient penetration, both of which detract from the overall quality of the weld. It is essential to prepare the surface by cleaning it of contaminants, including oxides, to ensure that a high-quality joint is formed during the welding process.