Abstract: A processing head assembly is provided for use with a movable tool holder of a machine tool. The processing head assembly includes an upper processing head coupled to the movable tool holder and having a body defining a socket, and a feed powder/propellant port coupled to the body and operably coupled to a feed powder/propellant supply. The processing head assembly further includes a lower processing head having a base configured to be releasably coupled to the socket, and a nozzle coupled to the base and defining a feed powder/propellant interface configured to detachably couple to the feed powder/propellant port and a nozzle exit orifice.

Abstract: Methods and apparatus for performing additive manufacturing processes using a machine tool may include controlling an orientation of a processing head to control the tangential angle of a fabrication energy beam, a feed powder nozzle, or both. The orientation of a non-circular energy beam may be control to more evenly distribute the energy beam across a width of a tool path. Additionally or alternatively, the orientation of the feed powder nozzle may be controlled to project toward a powder target that is spaced from a beam target. The powder target may be directed to a trailing edge of a beam spot formed by the energy beam to increase the amount of powder incorporated into a melt pool formed by the energy beam. Alternatively, the powder target may be directed to a leading edge of the beam spot to provide a self-correcting feature to address thickness errors formed in previous layers of added material.