Globular transfer is typically used with which type of shielding gas?

Globular transfer is commonly associated with the use of carbon dioxide as a shielding gas in Gas Metal Arc Welding (GMAW). When carbon dioxide is used, it tends to create a more pronounced welding arc and provides a distinctive transfer mode often characterized by larger metal droplets being transferred across the arc. This transfer mode is more prevalent under specific conditions, such as higher current settings, where the arc produces heat sufficient to melt the wire electrode and form these globular droplets.

Moreover, carbon dioxide is known for its good penetration and ability to create a stable welding operation, which enhances the overall weld quality when employing globular transfer. The use of carbon dioxide also contributes to cost-effectiveness and is beneficial for various applications, especially in structural welding.

In contrast, other gases like argon and helium typically lead to different transfer modes, such as short-circuiting or spray transfer, due to their distinct thermal and physical properties. For instance, argon is more commonly associated with spray transfer, and helium, being a lighter gas, is used where higher heat input and penetration are required but with different transfer characteristics. Therefore, carbon dioxide is the most suitable choice for globular transfer in this context.