Arc cuts, grooves, and other complex curves are included with the benefits of a 4th axis. This allows for advanced machining.
Turning is a machining process used to make cylindrical parts in which the cutting tool moves in a linear fashion while the workpiece rotates.
Typical materials cut with a plasma torch include steel, stainless, aluminum, brass and copper, and other conductive metals.
MIG welding requires the weld to be shielded from the atmosphere while Tig is an arc welding process that uses a tungsten electrode.