An electron beam welding process variation in which welding is accomp1ished at a pressure of 10-4 to 10-1 pascals (approximately 10-6 to 10-3 torr).
High vacuum electron beam welding is done inside a vacuum chamber. The chamber is evacuated to create a “high purity” environment (high vacuum) to avoid contamination by oxygen or nitrogen. This environment results in minimum heat effects and maximum reproducibility, and is required for high precision welding applications. Products include nuclear fuel elements, special alloy jet engine components, pressure vessels for rocket propulsion systems, and hermetically sealed vacuum devices. See ELECTRON BEAM WELDING