Fusion Welding

also known as melting welding, is a method of heating the workpiece interface to a molten state during the welding process under the action of high temperature and other factors, without applying pressure to complete the welding. During fusion welding, the heat source rapidly heats and melts the interface between the two workpieces to be welded, forming a molten pool. The molten pool moves forward with the heat source and forms a continuous weld after cooling, connecting the two workpieces into one. Due to the inherent high-temperature phase transformation process during welding, a heat affected zone will be generated in the welding area. According to the different heating sources, fusion welding can usually be divided into several categories: gas welding, arc welding (also divided into manual arc welding, submerged arc welding, etc.), gas shielded arc welding, plasma arc welding, slag welding, laser welding, and electron beam welding.

Pressure Welding

also known as pressure welding, refers to the application of a certain pressure to a composite welded part in a heated or unheated state, causing plastic deformation or melting, and through recrystallization and diffusion, achieving atomic bonding between two workpieces in a solid state, also known as solid-state welding. There are many types of pressure welding, including resistance welding, forging welding, contact welding, friction welding, gas pressure welding, cold pressure welding, explosive welding, etc.

Braze Welding

Using a metal material with a lower melting point than the workpiece as the brazing material, heating the workpiece and brazing material to a temperature higher than the melting point of the brazing material but lower than the melting point of the workpiece, wetting the workpiece with liquid brazing material, filling the interface gap, and achieving atomic diffusion with the workpiece to achieve welding.