NBC-270,NBC-350, NBC-500 Melting pole gas shielded welding machine MAG welder, MIG welder, NBC-270,NBC-350, NBC-500 Melting pole gas ... .4.Small splash and good welding formation. Application: 1.This machine is a flat CO2 silicon arc welder and also can be as ... NBC-270,NBC-350, NBC-500 Melting pole gas shielded welding machine