What is the principle of dioxygen shielded welding?

It is a carbon dioxide shielded welding bar, which uses carbon dioxide gas to isolate the air, so as to avoid thermal oxidation of the weldment.

The use of gas does not support combustion to protect the metal to be welded.

Introduce the working principle of carbon dioxide gas shielded welding, and what parts of the equipment are composed?

Carbon dioxide gas shielded welding is one of the welding methods, which is a method of welding with carbon dioxide gas as the shielding gas. It is easy to operate in terms of application and is suitable for automatic welding and all-round welding. There can be no wind during welding, which is suitable for indoor work.

Principle: Carbon dioxide gas shielded arc welding (referred to as CO2 welding) is a method of welding with carbon dioxide gas as the shielding gas. (Sometimes CO2+AR gas mixtures are used).

It is easy to operate in terms of application and is suitable for automatic welding and all-round welding. Poor wind resistance during welding, suitable for indoor operations. Due to its low cost, carbon dioxide gas is easy to produce and is widely used in large and small enterprises.

Due to the special influence of the zero thermophysical properties of carbon dioxide gas, when using a conventional welding power supply, it is impossible for the molten metal at the end of the welding wire to form a balanced axial free transition, and it is usually necessary to use a short circuit and a molten droplet necking explosion, so there is more spatter than the free transition of MIG welding. However, if a high-quality welding machine is used, the parameters are selected appropriately, and a very stable welding process can be obtained, so that the spatter can be reduced to a minimum. Due to the low cost of shielding gas** used, the weld seam is well formed with short transitions, and the use of welding wire containing oxygen absorber results in high-quality welded joints with no internal defects.

Therefore, this welding method has become one of the most important welding methods for ferrous materials.

[2. Carbon oxide gas protection attack.

The main components of welding equipment are: welding power supply, wire feeding mechanism, welding gun, gas circuit system (including gas cylinder, top heater, dryer, pressure reducer, flow meter, gas valve, hose, etc.) and control system.

The role of each part:

1. The function of welding power supply: to provide the current and voltage used in welding.

2. The function of the wire feeding mechanism: it is to send the welding wire in the wire spool to the outlet of the welding gun.

3. The function of the welding gun: it is a welding wire that outputs CO2 gas and conducts electricity.

4. The function of the gas supply system: it is to convert the CO2 liquid in the CO2 liquid cylinder into gas, enter the pipeline through depressurization, and shoot out of the nozzle with a certain flow rate.

5. The function of the control system:

1) Control welding start and stop.

2) Adjust the arc voltage and welding current.

3) Control and adjust the arc closing current and arc closing voltage.

4) Check the delivery of gas and the feeding of welding wire before welding.

Carbon dioxide shielding gas refers to the gas used to protect metal droplets, molten pools and weld areas during the welding process, which protects high-temperature metals from external gases.

CO2 gas shielded welding usually uses solid core welding wire, no arc stabilizer, so when using alternating current, the arc is unstable, spatter, and difficult to work normally, so the power supply of CO2 gas shielded welding is connected by DC current and reverse polarity. China basically does not produce arc welding generators for CO2 gas shielded welding, and currently uses rectifier power supply.

In order to ensure the stability of the welding process parameters in the welding process, when the filament CO2 gas shielded welding is adopted, the constant velocity wire feeding is matched with the flat characteristic power supply; When the thick wire CO2 gas shielded welding is used, the power supply is matched with the steep drop characteristic for variable speed wire feeding.

Gas welding is a commonly used metal welding method, and oxygen is an indispensable and important component of it. The principle of oxygen for gas welding is that it can participate in the redox reaction process of the metal, thereby strengthening and accelerating the combustion process of the metal, so that the oxygen and the burning fuel can be fully combusted, releasing a large amount of energy, and melting and heating the metal to a high enough temperature to achieve the purpose of welding.

Further, oxygen is mixed with fuel and ignited to produce a flame, which can be used in place of air to stimulate the combustion of metals. In welding, the high temperature and high pressure of the flame generated by the mixture of oxygen and combustion fuel can accelerate the redox reaction on the metal surface, so that the joint can be melted and joined. Therefore, oxygen needs to be released from the cylinder at the right pressure and flow rate to mix with the fuel to form the desired flame.

In addition, the oxygen pressure and flow rate used vary for different kinds of metal materials. For example, for thinner metal materials, lower oxygen flow and pressure are generally used to prevent burn-through and deformation. However, for thicker metal materials, higher oxygen pressures and flow rates are required to ensure that sufficient energy is released to allow for the thermal processing and melting of the metal.

In short, the principle of oxygen used in gas welding is that it can accelerate the combustion of fuel, produce a flame at high temperature and high pressure, so as to achieve the thermal processing and melting of the metal, and finally achieve the purpose of welding. Different types of metal materials require different oxygen pressures and flow rates to ensure a stable and efficient welding process. <>