To answer your question, there was no tempering or stress relief processes performed on this application.
The electron beam welding process characteristically puts in less heat and thermally induced stress than other welding processes. Therefore many EB welded components do not require heat treating; however some weld procedures do require subsequent stress relief operations. It is entirely dependent on the particular part and the customer weld specification.
-The PTR Team
PTRebWelding uploaded a videoThis video is a time lapse disassembly of a large chamber Electron Beam (EB) Welding system taken at our Enfield, CT facility.