02 Apr,2025
Carbon dioxide gas shielded arc welding
The shielding gas of carbon dioxide gas shielded arc welding (CO2 welding for short) is carbon dioxide (sometimes a mixture of CO2+O2 is used). Due to the special influence of the thermal physical properties of carbon dioxide gas, when using conventional welding power source, the molten metal at the end of the welding wire does not form a balanced axial free transition, and short circuit and molten droplet necking and explosive breaking are usually required. Therefore, compared with the free transition of MIG welding, there is more spatter.
However, if a high-quality welding machine is used and the parameters are selected appropriately, a stable welding process can be obtained, which can reduce spatter to a minimum. Since the shielding gas used is inexpensive, the weld is well formed when short-circuit transition is used, and the use of welding wire containing deoxidizer can obtain a quality welded joint without internal defects. Therefore, this welding method has become one of the most important welding methods for ferrous metal materials.
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