Characteristics and applications of common welding methods

1. Arc welding
Arc welding is one of the most common welding methods. It uses the heat generated by the arc to melt the metal and form a weld. Arc welding can be divided into many types, such as manual arc welding (manual arc welding), submerged arc automatic welding, gas shielded welding, etc.

Features:
Manual arc welding: simple equipment, flexible and mobile, strong adaptability, strong wind resistance, and outdoor welding operations. Suitable for welding of carbon steel, high alloy steel and non-ferrous metals.
Submerged arc automatic welding: high productivity, good weld quality, and good working conditions.
Gas shielded welding: good protection effect, stable arc, concentrated heat, suitable for welding of thin plates, aluminum alloys and other materials.
Application:
Arc welding is widely used in manufacturing industries such as automobile manufacturing, aerospace, construction and shipbuilding. Especially in the aerospace industry, which needs to withstand pressure and temperature changes under extreme conditions, laser welding is usually selected to ensure the strength and stability of the welding parts. In the automotive manufacturing industry, gas shielded welding is more often used to ensure the sealing and durability of the body structure.

2. Laser welding
Laser welding is a welding method that uses a high-energy laser beam as a heat source. It has the characteristics of concentrated energy and fast heating speed.

Features:
Energy concentration: suitable for welding of thin plates, aluminum alloys and other materials.
Fast heating speed: suitable for welding occasions with high precision and high strength requirements.
Application:
Laser welding is widely used in occasions requiring high precision and high strength, such as welding of key components in the aerospace industry.

3. Brazing
Brazing uses a metal with a melting point lower than that of the parent material as a brazing material. After heating, the brazing material melts, but the weldment does not melt. The liquid brazing material is used to wet the parent material, fill the joint gap and diffuse with the parent material to firmly connect the weldment together.

Features:
Joint strength: The joint strength of soft soldering is low (less than 70MPa), while the joint strength of hard soldering is high (greater than 200MPa).
Applicable materials: It can connect materials of different types and shapes, and is suitable for the connection of thin-walled and precision parts.
Application:
Brazing is often used in situations where the original properties of the welded materials need to be maintained and defects and deformations need to be reduced, such as the welding of electronic components.

4. Pressure welding
Pressure welding is a welding method that requires pressure regardless of whether heating is used during the welding process, including resistance welding, friction welding, cold pressure welding, diffusion welding, explosion welding, etc.

Features:
Maintaining material properties: It can maintain the original properties of the welded materials and reduce defects and deformation.
Equipment requirements: Larger equipment and energy are required, and there are certain restrictions on the shape and size of the workpiece.
Application:
Pressure welding is suitable for situations where material properties need to be maintained, such as the welding of high-strength steel and lightweight materials.

The above are some common welding methods and their characteristics and applications. Different welding methods are suitable for different materials and application scenarios. Choosing a suitable welding method is crucial to improving product quality.