GB/T8110-1995 "gas shielded arc welding of carbon steel, Copper Alloy Welding Wire" standard applies to carbon steel, low alloy steel melting polar gas using solid welding wire is recommended for gas tungsten arc welding and plasma arc welding the filler metal.
So: If you use different standards, welding wire and two wire security, there are different in composition.
Classification of wire:
1 Purpose: carbon steel wire; low-alloy steel wire; stainless steel wire; alloy welding wire; copper and copper alloy wire; aluminum and aluminum alloy welding wire; cast iron welding wire.
2 points by welding methods: submerged arc welding with wire; welding with wire; gas-shielded welding with wire; electroslag welding with wire.
3, according to the wire cross-section shape and structure: solid steel wire; Welding Wire China.
Mainly carbon dioxide gas shielded arc welding low carbon steel and low alloy steel welding.
TIG weld almost all metals, but mainly for non-ferrous metals and their alloys, stainless steel and some alloy welding.
So, if your weldment of different materials, the selected wire in the composition is not the same.