Which of the following is NOT a common type of welding used in ironworking?

Gas tungsten arc welding is not commonly utilized in ironworking, primarily because it is more specialized and is typically used for welding thinner materials or for particular applications that require precise welds, such as in certain aerospace or automotive contexts.

In contrast, the other welding methods mentioned are prevalent in the ironworking field. Metal Inert Gas (MIG) welding is favored for its speed and versatility, suitable for thicker materials and plate work. Shielded Metal Arc Welding (SMAW) is widely used in ironworking due to its robustness and adaptability in outdoor environments. Tungsten Inert Gas (TIG) welding, while it is a fine welding process, is still less common compared to the other methods in general ironworking applications.

Therefore, the emphasis in ironworking tends to be on methods that balance efficiency and strength in structural applications, leading to the lesser use of gas tungsten arc welding in this field.