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

The biggest characteristic of carbon dioxide gas welding is that it can prevent the oxygen in the air from contacting with the metal melted at high temperature at the welding point, and can protect the metal from oxidation in the welding process. Therefore, it has become one of the most important welding methods for ferrous metal materials.

Gas shielded arc welding is called gas shielded arc welding, which uses gas as the arc medium and protects the arc and the welding zone.

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

The shielding gas of carbon dioxide arc welding (CO2 welding for short) is carbon dioxide. Due to the special influence of the thermal physical properties of carbon dioxide gas, when using conventional welding power supply, it is impossible to form a balanced axial free transition by melting the metal at the welding wire end, which usually requires short circuit and droplet necking explosion. Therefore, compared with MIG welding free transition, there is more splash.

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

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

(2) The welding process is easy to operate, no slag or little slag, basically do not need to clean slag after welding.

(3) The arc heat concentration under the compression of the protection airflow, the welding speed is fast, the molten pool is small, the heat affected zone is narrow, and the welding parts after welding deformation is small.

(4) it is beneficial to the mechanization and automation of welding process, especially the mechanized welding of space position

(5) Magnesium, aluminum, hydrogen and their alloys with strong chemical activity and easy formation of high melting point oxide film can be welded

(6) Can weld sheet.

Matters needing attention:

1, gas welding current density is large, arc light intensity, high temperature, and high concentration of harmful gas 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 for arc initiation will produce a certain intensity of electromagnetic radiation.

3. Molybdenum, persimmon and other rare metals in the tungsten electrode materials used in arc welding are radioactive, especially radioactive dust is formed when the electrode is repaired.