Sure. Manually. Semi auto. GMAW, FCAW, GTAW, SMAW. I haven't seen your spec. I don't know what you are and are not allowed to do.
Orbitals are good for specific applications (for example small bore alloy thin walls, restricted space, etc), though quite expensive. But under most circumstances the repeatability and quality of manual and semi auto welds can be performed more than adequately.
I would not guess that fillet welds is a place where they are cost effective.