The basics of metal welding

Welding is a manufacturing process that joins metals or other thermoplastic materials using heat, high temperature, or high pressure.

According to the different heating degree and process characteristics in the welding process, the welding methods are divided into three categories:

(1) Fusion welding

The welding part of the workpiece is locally heated to a molten state to form a molten pool (usually adding filler metal), and a weld is formed after cooling and crystallization, and the welded workpiece is combined into an inseparable whole. Common fusion welding methods include gas welding, arc welding, electroslag welding, plasma arc welding, electron beam welding, laser welding, etc.

(2) Pressure welding

Pressure welding is to make the two workpieces realize atomic bonding in a solid state under pressure conditions, also known as solid state welding. Common pressure welding includes resistance welding, friction welding, cold pressure welding, diffusion welding, explosion welding, etc.

(3)Soldering and Brazing

After the solder (filler metal) with a melting point lower than the metal to be welded is melted, the joint gap is filled, and the connection is achieved by mutual diffusion with the metal to be welded. The workpiece to be welded does not melt during the brazing process, and generally there is no plastic deformation.

The welding method commonly used in Ruili Factory is arc welding.

(pictures from google)