Cut away view of the inside tip of a MIG gun called the nozzle
1) Torch Handle
(2) Molded phenolic dielectric (shown in white) and threaded metal nut insert (yellow)
(3) Shielded Gas Diffuser (Removable Tip)
(4) Contact tip for precise wire size. Common wire sizes are .35 and .45 of an inch
(5) Electrode wire fed from wire feeder
