Engineering a closed-loop control system for an electron beam welder for additive
manufacturing is challenging. For earth and space based applications, components must work in
a vacuum and optical components must be protected from becoming occluded with metal vapor.
For extraterrestrial applications added components increase launch weight and increase
complexity. Here we present three different control methods for electron beam free form
fabrication. A relatively simple coarse feedback control method is introduced that couples path
planning and electron beam parameter controls into the build process to increase flexibility and
improve build quality. The different approaches may be applied separately or together to provide
enhanced EBF3 system performance.Mechanical Engineerin
