Final answer:
GMAW-S is Gas Metal Arc Welding with short-circuiting, not prequalified by standard codes, requiring additional qualification testing.
Step-by-step explanation:
The statement refers to GMAW-S, which stands for Gas Metal Arc Welding using a short-circuiting transfer method.
In the context of welding, 'prequalified' indicates a welding procedure that has been recognized by codes and standards without the need for additional qualification testing.
This implies that GMAW-S is an exception to the common welding procedures that are typically considered prequalified, meaning users adopting this procedure must perform specific qualification tests before it is used in regulated applications.