This chapter covered GMAW in depth. This welding process can be used with both ferrous and non-ferrous metals. The machine used is a CV power type machine, which can also be used for FCAW. Changing the wire feed speed, gas type, and voltage will change how the welding wire melts and becomes a weld. The balance of these different settings creates transfer modes, of which there are four basic types: spray transfer, pulsed spray transfer, short circuit, and globular. There are also different GMAW guns such as a spool gun or push-pull gun. GMAW can be used with inert or active gasses which created the slang terms MIG and MAG welding. A welder should be familiar with the internal components of the machine and be comfortable resolving wire jamming and changing out the wire spools.