What should be avoided to prevent oxidation of the filler rod during welding?

To prevent oxidation of the filler rod during welding, it is crucial to keep the filler rod within the shielding zone. The shielding zone is created by the protective gas, such as argon or helium, which surrounds the weld area and displaces atmospheric air. Atmospheric air contains oxygen and nitrogen, which can react with molten metal and cause oxidation, leading to defects in the weld and filler rod.

When the filler rod is removed from this protective environment, it becomes exposed to oxygen and other contaminants, increasing the risk of oxidation. Oxidation not only compromises the integrity of the filler metal but can also affect the overall quality of the weld. Therefore, maintaining the filler rod in the shielding gas area is essential for ensuring a clean and effective weld.

Using non-compatible filler metal may lead to issues with weld quality but does not specifically relate to oxidation prevention. Welding without gas is a direct cause of oxidation, as there is no protective atmosphere to shield the weld area. A slower travel speed might increase heat input but does not inherently protect against oxidation in the absence of proper gas shielding.