The role of carbon dioxide in welding

The core role of carbon dioxide in welding
During the welding process, high temperatures will cause the metal to react with oxygen in the air to produce metal oxides, which will reduce the quality of the welded joint, resulting in a decrease in its strength, toughness and corrosion resistance. Carbon dioxide, as a shielding gas, can isolate the welding area from the oxygen in the air and prevent metal oxidation, thereby ensuring the quality and performance of the welded joint.

Significant advantages of carbon dioxide shielded welding
Reducing welding costs: Carbon dioxide is relatively cheap and easy to obtain and use. Its cost is only 40% to 50% of that of submerged arc welding and arc welding.
Increasing production efficiency: It has a higher melting rate and thermal efficiency, and its productivity is 1 to 4 times that of arc welding.
Optimizing welding quality
The weld has high crack resistance, low hydrogen and low nitrogen content.
The deformation after welding is small, the angular deformation is 5/1000, and the unevenness is only 3/1000.
Reducing welding spatter: When ultra-low carbon alloy welding wire or flux-cored welding wire is used, or argon is added to carbon dioxide, welding spatter can be reduced.
Easy and flexible operation: simple operation, suitable for automatic welding and all-round welding, open arc welding, all-position welding and downward welding, no limit on the thickness of the workpiece, and relatively friendly to operators.
Application scenarios of carbon dioxide in different welding types
Carbon dioxide shielded welding: Welding with carbon dioxide gas as a shielding gas is one of the most important welding methods for ferrous metal materials. It is widely used in steel structure welding in the construction and engineering fields, welded parts manufacturing in the manufacturing industry, and automobile body welding.
Gas metal arc welding (GMAW): Carbon dioxide can be used as an auxiliary gas and mixed with inert gases such as argon to adjust the temperature and atmosphere of the welding area.
High energy density welding: In high energy density welding methods such as laser welding and plasma arc welding, carbon dioxide can be used to assist in cooling and protecting the welding area.