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Carbon Dioxide Gas Shielded Welding

Mar 07, 2019

Carbon dioxide gas shielded welding is one of the welding methods. It is a method of protective welding by using a mixture of 82% argon gas and 18% carbon dioxide as a shielding gas. It is easy to operate and suitable for manual welding and all-round welding in different positions. During the welding, a protective gas flows out, and the welding position forms an isolated air from the outside. Guarantee the quality of welding. Suitable for indoor work.

Carbon dioxide gas shielded arc welding (referred to as CO2 welding) uses carbon dioxide gas as a shielding gas.

The method of welding. (Sometimes a mixed gas of CO2+Ar is used). Simple in application, suitable for automatic welding and all-round welding. It has poor wind resistance during welding and is suitable for indoor work. Because of its low cost, carbon dioxide gas is easy to produce and is widely used in enterprises of all sizes. Due to the special influence of the thermal physical 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, and therefore, with MIG welding. Compared to the free 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 is well formed by short-circuit transition, and the use of a 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.

Advantages

1. The welding cost is low. The cost is only 40~50% of submerged arc welding and electrode arc welding.

2. High production efficiency. Its productivity is 1 to 4 times that of electrode arc welding.

3. Easy to operate. The arc is not limited to the thickness of the workpiece. It can be welded at all positions and can be welded down.

4. The weld has high crack resistance. The weld is low in hydrogen and contains less nitrogen.

5. Less deformation after welding. The angular deformation is five thousandths, and the unevenness is only three thousandths.

6. Welding spatter is small. When using ultra-low carbon alloy wire or flux cored wire, or adding Ar in CO2, welding spatter can be reduced.

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