What gas is commonly associated with porosity issues in welds?

Carbon dioxide is commonly associated with porosity issues in welds, particularly in processes like Gas Tungsten Arc Welding (GTAW). When using carbon dioxide as a shielding gas, it can lead to the formation of pores within the weld due to its chemical reactivity and potential to form oxides. This is especially problematic because porosity can significantly weaken the integrity of the weld and affect its overall performance.

In contrast, argon is typically used as a shielding gas in GTAW for its non-reactive properties, providing an inert atmosphere that helps to minimize defects such as porosity. Oxygen and acetylene, while used in different welding processes, are not typically associated with porosity in GTAW. Instead, they have their own set of applications and characteristics, which do not directly contribute to the same issues seen with carbon dioxide.