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Some little knowledge about carbon dioxide gas shielded welding
发布时间：
2022-07-28
Carbon dioxide gas shielded welding is one of the welding methods. Carbon dioxide gas is used as the shielding gas. In order to improve the process performance of CO2 welding, CO2+Ar or CO2+Ar+O2 mixed gas can also be used for welding. Carbon dioxide gas shielded welding is one of the welding methods. Carbon dioxide gas is used as the shielding gas. In order to improve the process performance of CO2 welding, CO2+Ar or CO2+Ar+O2 mixed gas can also be used for welding.
Carbon dioxide gas shielded welding is one of the welding methods. Carbon dioxide gas is used as the shielding gas. In order to improve the process performance of CO2 welding, CO2+Ar or CO2+Ar+O2 mixed gas can also be used for welding.
Simple operation in application, suitable for automatic welding and omnidirectional welding. There can be no wind when welding, suitable for indoor work. Due to the special influence of the thermophysical properties of carbon dioxide gas, when using a conventional welding power source, it is impossible for the molten metal at the end of the wire to form a balanced axial free transition, and short-circuit and droplet necking and blasting are usually required. Therefore, with MIG welding free More splashes compared to transitions.
However, if a high-quality welding machine is used and the parameters are properly selected, a very stable welding process can be obtained, and the spatter can be reduced to a minimum. Due to the low price of the shielding gas used, the weld seam is well formed when short-circuit transition is used, and the use of deoxidizer-containing welding wire can obtain quality welded joints without internal defects.
Working principle of gas shielded welding One of the main functions of all protective gases is to isolate oxygen, nitrogen and water vapor in the air and protect the welding pool and electrodes. The shielding gas enters through the welding torch, sprays out from the welding nozzle, surrounds the electrode, replaces the air around the electrode, and forms a temporary shielding gas shield around the molten pool and the arc. Both CO2 gas and Ar/CO2 mixture can achieve this purpose.
These shielding gases promote the formation of arc plasma,
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