Carbon dioxide gas shielded arc welding
The protective gas for carbon dioxide gas shielded arc welding is carbon dioxide (sometimes a mixture of CO2+Ar). It is mainly used for manual welding. Due to the special influence of the thermophysical properties of carbon dioxide gas, it is impossible to form a balanced axial free transition of the molten metal at the end of the wire when using a conventional welding power source. Usually, short-circuit and melt-dropping are required, so that it is free from MIG welding. Compared to the transition, there are more splashes. 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 welding wire containing a 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 materials.