APPLICATIONS & WELDING
Pure aluminum is a very ductile metal. It forms a large number of alloys with the different alloying elements (Cu, Mn, Si, Mg, and Zn). Their different mechanical properties depends on the type of their microstructure resulting from the chemical composition and the type of cold hardening or the heat treatment cycle. Aluminum products are derived either from casting or wrought processes. Wrought alloys are in turn grouped into two classes: heat treatable (precipitation hardening) alloys (2xxx, 6xxx and 7xxx series) and Non-Heat-Treatable (cold hardening) alloys.
There are variable and several applications of aluminum and its alloys. For example, one find the use of 1xxx series (pure Al) in the chemical industry, cryogenic applications and architecture; 3xx series in energy (eg., heat exchangers); 4xxx series for welding filler metals; 5xxx series in the marine and automotive fields; 6xxx series in structures and automobile; 2xxx and 7xxx series in the field of aerospace and defense.
Aluminum alloys are weldable by inert gas-shielded arc welding processes MIG/TIG, torch with neutral/carburizing flame and to a lesser degree MMA. The problems inherent in the welding of these alloys consist mainly of the following:
The choice of the filler metal depends on several parameters, namely: fluidity, sensitivity to hot cracking, strength, ductility of the joint, service temperature, corrosion resistance, color equivalence between the joint and the base metal after adonization.
Solutions available in: