What role does the filler material play in TIG welding?

In TIG welding, filler material plays a crucial role by filling the joint between the base materials being welded. This material is added to the weld area to ensure that the joint has enough substance to maintain its integrity and strength after the welding process is complete. By providing a filler, the welder can create a stronger bond between the pieces being joined, as it helps to create a more complete and robust weld pool.

The filler material also contributes to the structural integrity of the finished weld, allowing for better load distribution and resistance to potential stresses. This is particularly important in applications where the welded joint will be subjected to weight or movement. Thus, the filler material is essential for achieving a durable, high-quality weld that meets industry standards.

Other options mentioned may touch on aspects of the welding process, but none address the fundamental role of filler material in reinforcing and completing the joint as effectively as the correct choice does.