What is the function of a gas cylinder in GMAW?

The function of a gas cylinder in Gas Metal Arc Welding (GMAW) is to house and control the shielding gas. In GMAW, an arc is created between a continuously fed wire electrode and the workpiece, generating heat to melt the materials being joined. The shielding gas plays a crucial role in this process by protecting the molten weld pool from atmospheric contamination, such as oxygen and nitrogen, which can lead to defects like porosity and oxidation.

Using a gas cylinder allows for the storage of gases such as argon, carbon dioxide, or a mixture of gases, which can be precisely regulated to maintain the appropriate flow rate and pressure for optimal welding conditions. This control is essential for achieving good weld quality and protecting the weld pool, thereby contributing to the overall integrity of the welded joint.