AM based on plasma arc welding is widely used to make metallic parts, where the plasma arc is mainly a transferred arc, instead of a non-transferred arc. An arc created in gas tungsten arc welding exists near an electrode, and thus the operational ability of the arc is limited by its physical proximity to the electrode. If the arc was created far away from the electrode, it could have more freedom—the effect of melting due to the arc could have been planned without worrying about its negative consequence on the electrode. Besides, feeding could not have been restricted due to a constricted space between the electrode and the workpiece, and the size of the melt pool could not have been limited due to a limited variation in arc dimension. These limitations are in sharp contrast to the freedom provided by a laser beam—the effect of the beam spot on a workpiece does not affect a laser source.