Aluminium – the allrounder
Aluminium is with a density of 2,7 – 2,9 kg/dm³ a light metal. In conjunction with air the material forms a silver-white impermeable oxide coating. Due to this coating aluminium is very resistant to corrosion.
Aluminium, a versatile material
The alloy properties can be impact by addition of e.g. copper, lead, magnesium, manganese, silicium or zinc. Alloys like EN AW-7022 and EN AW-7075 have high strength but by addition with zinc and copper these alloys are prone to corrosion and limited welable. For a cold formability these alloys are unsuitable.
Pure aluminium (EN AW-1050A and EN AW-1350A) possesses a high heat and electrical conduction and is really good cold moldable like swage, deep-drawing, bending, metal-spinning and impact extruding. The alloy is really good welable, very good suitable for anodizing and is approved for the contact with foods in accordant with DIN EN 602. The application area of EN AW-1350A is often the electrical industry. Due to the high electrical conduction of 18-22 MS/m the alloy can be used as an electrical conductor. The mechanical machinability is certainly inapplicable.
The standard alloy for sheets is usually EN AW-5754. It possesses good seawater resistance and weatherability, a good cold formability and it is really good for tungsten-inert gas welding and inert gas metal arc welding. It is good to very good suitable for anodizing. This alloy is unusual in the range for bars, tubes and profiles because the material is difficult to compressible.
The alloy EN AW-5019 is useful for the application area of precision engineering and optics (predominant anodized or pigmented) as well as for the mechanical engineering, shipbuilding, automotive industry, pipeline construction and frames. This alloy is good resistant to seawater and weather, suitable for tungsten-inert gas welding and inert gas metal arc welding, good for cold formability and has good to satisfiable results of anodizing.
A combination of the alloys above is the alloy EN AW-6082. This alloy possesses a combination of the highest strength, toughness and resistance to corrosion. It is good machinable (minimal tensile strength of 290 N/mm²), weldable, suitable for anodizing, cold moldable and allowed for contact with foods in accordant with DIN EN 602. Its electrical conduction is 24-32 MS/m.
With a value of 33,1 MS/m and a condition of T6 the alloy EN AW-6101B has the highest electrical conduction. The main applications for this alloy are bus bars, electrical conductions and heat sinks. The minimal tensile strength is up to 215 N/mm².