Form: This specification covers an aluminum alloy in the form of welding wire. Application: Primarily for use as filler metal for gas-metal-arc and gas-tungsten-arc welding of aluminum alloy castings having similar composition (355.0@ A355.0@ and C355.0) and requiring in the weld zone response to heat treatment@ properties@ and corrosion resistance comparable to those of the castings. Classification: Wire supplied to this specification is classified as follows: Type 1 ?C As Extruded and Sized Type 2 ?C As Drawn Unless a specific type is ordered@ either type may be supplied.