In FCAW, what is the primary purpose of using shielding gas?

In flux-cored arc welding (FCAW), the primary purpose of using shielding gas is to protect the molten weld pool from contamination and atmospheric elements such as oxygen and nitrogen, which can adversely affect the quality of the weld. This protection is critical, as these contaminants can lead to issues such as porosity, decreased strength, and poor ductility of the finished weld.

While shielding gas does help in maintaining a stable arc and can contribute to other aspects of the welding process, its foremost function is to create a barrier around the weld pool to ensure that it solidifies cleanly and without defects. This protective atmosphere allows for a high-quality weld to be achieved, which is paramount in structural applications where weld integrity is essential.

The role of shielding gas is fundamental in maximizing the effectiveness of FCAW by ensuring that the weld is strong and free from impurities, ultimately leading to a safer and more reliable end product in structural steel applications.