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6061 is a precipitation hardening aluminum alloy, containing magnesium and silicon as its major alloying elements. 6061 is highly weldable, for example using tungsten inert gas welding (TIG) or metal inert gas welding (MIG). Typically, after welding, the properties near the weld are those of 6061-0, a loss of strength of around 80%. The material can be re-heat-treated to restore -T4 or -T6 temper for the whole piece. After welding, the material can naturally age and restore some of its strength. Typical filler material is 4043 or 5356. Machinability in the harder T4 and T6 tempers is good. It is notably less easy to machine in the annealed temper. Commonly used in the manufacture of heavy-duty structures requiring good corrosion resistance, truck and marine components, the construction of aircraft structures such as wings and fuselages, yacht construction, bicycle frames and components and automotive parts, such as wheel spacers.