Hybrid Laser Welding of 0.2% Be-Cu Alloy for Ultra-High Vacuum Systems

We investigated the fundamental characteristics of welding 0.2 wt% Be-Cu (BeCu) using a Blue＋IR hybrid laser. Butt welding of BeCu plates, welding of a one-sided rotating nipple (ICF70)-which cannot be fabricated by conventional machining-and dissimilar material welding between steel use stainless (SUS) and BeCu were performed. These trials successfully demonstrated the feasibility of fabricating vacuum components that were previously considered unmanufacturable. Furthermore, tensile tests of the SUS/BeCu dissimilar welded joints revealed strengths exceeding that of SUS itself, confirming both the viability and effectiveness of this welding technique.