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 casting having similar composition (357.0@ A357.0@ and B357.0 and D357.0) 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.