What is one disadvantage of GTAW?

The selected answer identifies a notable disadvantage of Gas Tungsten Arc Welding (GTAW), particularly when it comes to welding metal thickness. In GTAW, the technique is generally more suited for thinner materials rather than heavy or very thick sections. The high levels of precision, control, and heat input associated with GTAW make it challenging for welders to achieve effective weld penetration in materials exceeding 1/4 inch in thickness.

As thickness increases, the risk of issues such as insufficient penetration, which may compromise the quality and strength of the weld, also heightens. Consequently, while GTAW provides exceptional results for thin to moderately thick materials through its ability to produce clean, high-quality welds, it becomes less effective for thicker metals that often require other welding processes capable of delivering more heat and faster travel speeds, such as Shielded Metal Arc Welding (SMAW) or Submerged Arc Welding (SAW).

The other choices do not represent disadvantages in the same context. For instance, GTAW is not inherently suitable for very thick metals, which directly contradicts choice A. Choices concerning reposition rates and the need for specialized equipment don't accurately reflect the unique limitations associated with metal thickness and welding outcomes in GTAW.