Carbon dioxide gas shielded welding, manual welding, and argon arc welding are three common welding methods, each with its own characteristics and applicability. This article will compare and analyze welding principles, welding equipment, welding characteristics, and application fields.

1、 Welding Principles

Carbon dioxide gas shielded welding: Carbon dioxide gas shielded welding is a semi-automatic or fully automatic arc welding method that uses carbon dioxide as a protective gas. It utilizes the heat generated by the arc between the welding wire and the workpiece to melt the welding wire and fuse with the workpiece, forming a uniform weld seam. Carbon dioxide decomposes into carbon monoxide and activated carbon in the arc, which can further react with iron to form ferritin, thereby improving the mechanical properties of the weld seam.

Manual welding: Manual welding is an arc welding method that uses electrodes as a source of molten metal. It utilizes the heat generated by the arc between the electrode and the workpiece to melt the electrode and fuse with the workpiece, forming a uniform weld seam. The surface of the electrode is covered with a coating, which can generate protective gas, slag layer, and alloy elements during the combustion process, thereby protecting the arc and molten pool and improving the quality of the weld seam.

Argon arc welding: Argon arc welding is an arc welding method that uses an inert gas (such as argon) as the shielding gas. It utilizes the heat generated by the arc between the non consumable tungsten electrode and the workpiece to melt the filler metal (such as steel wire) and fuse with the workpiece, forming a uniform weld seam. Inert gas can effectively protect the arc and molten pool, prevent impurities from entering the air, and improve the cleanliness and mechanical properties of the weld seam.

2、 Welding equipment

The equipment required for carbon dioxide gas shielded welding mainly includes: DC or AC power supply, carbon dioxide gas source, pressure gauge, pressure reducing valve, flow meter, wire feeder, wire duct, nozzle, clamp, etc.

The equipment required for manual welding mainly includes: DC or AC power supply, cables, electrode clamps, electrodes, etc.

The equipment required for argon arc welding mainly includes: DC or AC power supply, inert gas source, pressure gauge, pressure reducing valve, flow meter, tungsten electrode clamp, tungsten electrode, conduit, nozzle, clamp, etc.

3、 Welding characteristics

The characteristics of carbon dioxide gas shielded welding include:

Fast welding speed and high production efficiency;The weld seam is well formed, with a smooth surface and few pores;Small welding deformation and small heat affected zone;Suitable for welding in various positions, with flexible operation;Carbon dioxide gas is easy to obtain and has low cost;A large amount of smoke and dust are generated during the welding process, which has a certain impact on the environment and human body;Splash is easily generated during the welding process and needs to be cleaned;The welding arc has poor stability and is easily affected by wind power.

The characteristics of manual welding include:

The welding equipment is simple, easy to carry and move;Welding operation is simple and easy to master;Suitable for welding of various materials and thicknesses, especially with advantages for connecting different materials;Capable of welding without power or with unstable power supply;The quality of welding seams is greatly influenced by factors such as electrode type, specification, quality, and storage;Low welding efficiency, high electrode consumption, and high cost;A large amount of smoke and slag layers are generated during the welding process, which has a certain impact on the environment and human body;Large welding deformation and large heat affected zone.

The characteristics of argon arc welding include:

High weld quality, high purity, and good mechanical properties;The weld seam is well formed, with a smooth and clean surface and few pores;Small welding deformation and small heat affected zone;Suitable for welding of various materials and thicknesses, especially for welding of non-ferrous metals such as stainless steel and aluminum alloys;Slow welding speed and low production efficiency;Inert gas consumption is high and the cost is high;Welding equipment is complex and difficult to operate;During the welding process, it is easy to generate arc light and ultraviolet rays, which pose certain hazards to the eyes and skin.

4、 Application field

Carbon dioxide gas shielded welding: Carbon dioxide gas shielded welding is mainly applicable to the welding of black metals such as low-carbon steel and low alloy steel, especially in industries such as automobiles, ships, bridges, and buildings.

Manual welding: Manual welding is mainly suitable for welding various metal materials such as carbon steel, stainless steel, cast iron, etc., especially in the fields of repair, installation, maintenance, etc. It is widely used.

Argon arc welding: Argon arc welding is mainly applicable to the welding of non-ferrous metals and their alloys such as stainless steel, aluminum alloy, magnesium alloy, titanium alloy, etc., especially in high-tech fields such as aviation, aerospace, nuclear energy, chemical industry, etc.

summary

Carbon dioxide gas shielded welding, manual welding, and argon arc welding are three common welding methods, each of which has its own advantages, disadvantages, and applicability. When selecting welding methods, comprehensive consideration should be given to factors such as material properties, structural form, process requirements, and economic benefits. This article compares and analyzes welding principles, welding equipment, welding characteristics, and application fields, hoping to be helpful to you!