What should be done when repositioning or stopping during welding?

When repositioning or stopping during welding, maintaining the filler rod in post purge is important to prevent contamination of the weld pool. Post purge refers to the action of allowing the inert shielding gas to continue flowing around the weld area even after the arc has been extinguished. This helps protect the molten metal from oxidation and contamination from atmospheric elements like nitrogen and oxygen, which can adversely affect the quality of the weld.

Maintaining the filler rod in post purge ensures that any remaining heat in the weld pool is shielded effectively while the welder adjusts their position or pauses work. This practice is particularly crucial in Gas Tungsten Arc Welding (GTAW), where the integrity of the weld is heavily reliant on a clean and uncontaminated environment. By following this procedure, welders can produce stronger and cleaner welds, ultimately leading to a better quality finished product.