Carbon dioxide gas shielded arc welding (referred to as CO2 welding) is carbon dioxide gas as a shielding gas, welding methods. (Sometimes using a gas mixture CO2 + Ar).

In the application of simple operation, suitable for automatic welding and full welding. Poor wind resistance welding, suitable for indoor operation.

Because of its low cost, easy to produce carbon dioxide gas, is widely used in the size enterprises.

Due to the special physical properties of carbon dioxide affect 0 hot gases, the use of conventional welding power source, wire ends to form a molten metal is impossible to balance the freedom of axial transition usually requires the use of a short circuit and burst off the droplet necking, therefore, and MIG welding freedom transition compared to splash more. However, such high-quality welding, the appropriate parameters can be obtained by the welding process is stable, so that splashing is reduced to a minimum.

Because of the protective gas prices low, while the use of short-circuit transition weld good, plus wire deoxidizer containing no internal defects can get high-quality welded joints. So this welding method has now become one of the most important methods of welding ferrous materials.