Form: This specification covers an aluminum alloy in the form of two types of welding wire. Application: This wire has been used typically as filler metal for gas-metal ?Carc and gas-tungsten-arc welding of aluminum ally castings having similar composition and requiring@ in the weld zone@ response to heat treatment@ properties@ and corrosion resistance comparable to those of the castings@ but usage is not limited ot such applications. Classification: Wire supplied to this specification is classified as follows: Type 1 As Extruded an Sized Type 2 As Drawn Unless a specific type is ordered@ either type may be supplied.