ER50-4 is a copper plated welding wire for gas protection, which can be protected by CO2 or argon rich gas during welding.
ER50-6 is a gas shielded copper plated welding wire, which can be protected by CO2 or argon rich gas during welding.
ER50G is a gas shielded copper plated welding wire that can be protected by CO2 or argon rich gas during welding.
ER50-C is a copper plated gas shielded welding wire for carbon steel and low-alloy steel.