FCAW-GS and outer shield are the same as?

FCAW-GS, which stands for Flux-Cored Arc Welding with Gas Shielding, is indeed similar to the concept of dual shield welding. In dual shield welding, a flux-cored wire provides a source of shielding gas and slag, while an additional external shielding gas is also used to create a protected welding environment. This combination allows for improved arc stability, reduced spatter, and enhanced weld quality.

In FCAW-GS, the flux within the core of the wire generates shielding gas to protect the weld pool from contamination during the welding process. When combined with an external shielding gas, the setup is effectively functioning as a dual shield system. This is particularly advantageous in various applications, providing a more controlled environment for welding.

The other options have distinct processes and do not align with the characteristics of FCAW-GS and outer shield. For example, flux core alone does not specify the use of an external shielding gas, and gas metal arc welding (MIG) is not specifically a dual shielding process. Understanding these distinctions is crucial for anyone working with welding codes and techniques.