... 270,NBC-350, NBC-500 Melting pole gas shielded welding machine MAG welder, MIG welder, NBC-270,NBC-350, ... NBC-500 Melting pole gas shielded welding machineCharacteristics: 1.Simple structure, reliable performance, less breakdown. 2. ... feeding wires.4.Small splash and good welding formation. Application: 1.This machine is a flat CO2 silicon arc ... NBC-500 Melting pole gas shielded welding machine