Which welding process is not included among the prequalification back gouging conditions?

• A. SMAW
• B. MCAW
• C. GMAW
• D. TIG

Answer: (D)

Back gouging is the process of removing weld metal from the root side so the joint can be inspected and completed properly. In prequalification tests, the gouging methods that are considered acceptable are those that can efficiently remove metal using arc welding equipment—typically carbon-arc gouging associated with the SMAW setup, and formats of MCAW or GMAW that are allowed by the code. Tungsten inert gas welding isn’t used for gouging in these prequalification scenarios because it isn’t a practical or designated method for removing metal quickly and effectively. It’s a precision welding process intended for clean, tight welds rather than material removal, so it’s not listed as an approved back gouging option.