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It is a welding method using a mixture of a small amount of oxidizing gas (CO2, O2, or other mixed gases) added to argon gas as the shielding gas for welding.

Advantages:

① The temperature of the weld pool and droplet is higher than that of pure argon arc welding, and the current density is larger, consequently resulting in a greater depth of fusion, thicker weld seam, faster melting speed of the welding wire, higher deposition efficiency, and improved welding productivity.

② CO2 gas is relatively inexpensive, which reduces the welding cost.