What is the role of carbon dioxide gas in industrial welding?

Carbon dioxide gas shielded welding is one of the welding methods, which is a method of welding by carbon dioxide gas shielded gas. In terms of application, the operation is simple, suitable for automatic welding and all-round welding. There can be no wind when welding, suitable for indoor operations, because of its low cost, easy production of carbon dioxide gas, widely used in various small and large enterprises.

The biggest feature of carbon dioxide gas shielded welding is that it can prevent the oxygen in the air from contacting the metal at the welding point, which can protect the metal from oxidation during the welding process, so it has become one of the most important welding methods for ferrous metal materials.

Gas shielded welding is the use of gas as the arc medium and protect the arc and welding area arc welding is called gas shielded arc welding, referred to as gas shielded welding.

Gas shielded welding is usually divided into six types according to whether the electrode is melted and the protective gas is different: Non-molten (tungsten) inert gas shielded welding (TIG) and molten gas shielded welding (GMA W), which includes inert gas shielded welding (MIG), oxidizing mixed gas shielded welding (MAG), CO2 gas shielded welding, tubular wire gas shielded welding (FCAW).

Carbon dioxide gas arc welding (referred to as CO2 welding) protection gas is carbon dioxide. Due to the special influence of the thermal physical properties of carbon dioxide gas, when using conventional welding power sources, the welding wire end molten metal can not form a balanced axial free transition, usually need to use short circuit and melt drop necking burst, therefore, compared with MIG welding free transition, splash more.

Compared with other welding methods, gas shielded welding has the following characteristics:

(1) The visibility of arc and molten pool is good, and welding parameters can be adjusted according to the situation of molten pool during welding.

(2) The welding process is easy to operate, there is no slag or very little slag, and basically no slag cleaning is required after welding.

(3) The heat of the arc is concentrated under the compression of the protective air flow, the welding speed is faster, the melt pool is smaller, the heat affected zone is narrow, and the deformation of the weldment is small after welding.

(4) It is conducive to the mechanization and automation of the welding process, especially the mechanized welding of the spatial position

(5) Can weld magnesium, aluminum, hydrogen and their alloys with strong chemical activity and easy to form a high melting point oxide film

(6) Can be welded sheet.

Note:

1, gas shielded welding current density, arc intensity, high temperature, and high concentration of harmful gases under the action of high temperature arc and strong ultraviolet light, so special attention should be paid to ventilation.

2, the high frequency oscillator used in the arc will produce a certain intensity of electromagnetic radiation.

3. Rare metals such as molybdenum and persimmon in tungsten electrode materials used in arc welding are radioactive, especially radioactive dust is formed when the electrode is polished.