Which welding technique allows for manual introduction of filler metal if required?

The technique that allows for manual introduction of filler metal when required is Gas Tungsten Arc Welding (GTAW), also known as Tungsten Inert Gas (TIG) welding. In GTAW, the welder uses a non-consumable tungsten electrode to produce the weld. Filler metal can be added manually to the weld pool as needed, which provides the welder with greater control over the weld bead and the ability to adjust the amount of filler introduced based on the specific requirements of the joint being welded.

This capability is particularly valuable in applications requiring precision and quality, as it allows the welder to ensure that the right amount of material is added to achieve optimal penetration and fusion without compromising the characteristics of the base metals involved. The manual feeding of filler metal can also lead to more refined weld aesthetics and improved performance in critical applications.

In contrast, other welding techniques mentioned involve different processes: Submerged Arc Welding typically uses a continuous filler wire that feeds automatically and doesn’t allow for manual addition. Metal Arc Gas Shielded Welding and Gas Tungsten Arc Welding also have specific processes that might not accommodate manual addition of filler metal as seamlessly as GTAW does, focusing instead on their own predefined techniques.