Which of the following welding processes is NOT included in the prequalified welding processes by AWS D1.1 code?

The correct choice highlights that the Gas Tungsten Arc Welding (GTAW) process is not designated as a prequalified welding process under AWS D1.1 Structural Welding Code – Steel. Prequalified welding processes are those that have established procedures and parameters that can be utilized without the necessity for additional qualification testing, based on the AWS D1.1 criteria.

The prescriptive nature of prequalification is intended to simplify the process for welders and engineers, ensuring that they can rely on established techniques without needing to conduct extensive tests for certain welding methods. While SMAW (Shielded Metal Arc Welding), SAW (Submerged Arc Welding), and FCAW (Flux-Cored Arc Welding) have been determined by AWS D1.1 to meet specific requirements and are thus included in the prequalified processes, GTAW does not fall into this category.

GTAW does require specific qualification due to its unique characteristics and applications, which may necessitate tailored procedures. Understanding these distinctions is crucial for adherence to the AWS D1.1 code, especially for ensuring compliance during project execution.