High silicon aluminium alloys

High silicon aluminium alloys

High silicon aluminium alloys have an important role to play in aerospace, aviation, automotive and space technology, but their excellent properties have made their welding challenges increasingly prominent.

There are three main types of welding methods for commonly connected high-silicon aluminium alloys: melt welding, brazing and solid phase welding. Melt welding joint performance is poor, generally using rapid thermal cycling and low heat input high energy density welding, including electron beam welding and laser welding, to help reduce the defects caused by melt welding, so in recent years in this area to carry out more research. Brazing methods are metal welding methods in which the base metal is not melted, the gap is filled by melting the brazing material and metallurgical effects such as dissolution and diffusion occur between the metal and the base material.

Solid-state welding technology is a welding method in which the surface of the weld is cleaned, static or dynamic pressure is applied, heated or unheated, and a solid combination of the two materials occurs without melting the base material. Friction welding, diffusion welding, explosion welding, ultrasonic welding, etc. are all in this category. Pressure welding methods available for high silicon aluminium alloys are: friction welding, vacuum diffusion welding, etc.