Which of the following is NOT a pre-qualified process under D1.1 code?

In the context of the Structural Welding Code – Steel (D1.1), one of the important aspects is understanding which welding processes are pre-qualified. Pre-qualified processes are those methods that do not require the extensive and rigorous testing that other welding methods might necessitate before being used in the field.

The Gas Metal Arc Welding (GMAW) process, specifically the short circuiting mode (GMAW-S), is not considered a pre-qualified process under D1.1. This means that if a project specifies GMAW-S, the weld procedures must undergo qualification testing to ensure compliance with the standards outlined in the code before they can be used on structural steel projects.

In contrast, the Shielded Metal Arc Welding (SMAW), Flux Cored Arc Welding (FCAW), and Submerged Arc Welding (SAW) processes are recognized as pre-qualified methods. These processes have established and accepted parameters that allow them to be utilized without additional qualification, facilitating more efficient project execution by eliminating the need for extensive testing as long as the prescribed parameters are followed.

Understanding the classification of these welding processes is crucial for anyone involved in structural welding, as it informs both the selection of welding techniques and the subsequent testing and documentation required for code compliance.