Introduction Of CO2 Welding

The shielding gas for carbon dioxide gas shielded arc welding (CO2 welding) is carbon dioxide (sometimes a mixed gas of CO2+O2). Due to the special influence of the thermophysical properties of carbon dioxide gas, when using conventional welding power sources, it is impossible to form a balanced axial free transition of the molten metal at the end of the steel wire, which usually requires short circuit and droplet blasting, therefore, with MIG Compared to the free transition of welding, there is more splash. However, if a high-quality welder is used, the parameters are selected appropriately, and a very stable welding process can be obtained to minimize the splash.

Due to the low price of the shielding gas used, the weld bead is well formed by short-circuit transition, and the use of a steel wire containing a deoxidizer can obtain a high-quality welded joint without internal defects. Therefore, this welding method has become one of the most important welding methods for ferrous materials.