Abstract
The electron-beam (EB) welding process is being considered for welding structural materials for the large superconducting magnets, because it is a highly effective process for welding thick, heavy, steel plates. A 70-mm-thick 22Mn-13Cr-5Ni-0.22N austenitic stainless steel plate, recently developed for cryogenic use, was welded by the EB welding process, and the characteristics of the welded joint were investigated. The results are: (1) The welded joint had sound cross sections without any weld defects, such as cracks and blowholes, although the weld metal had a fully austenitic microstructure and a high nitrogen content. (2) The tensile strength of the welded joint was about 1570 MPa at 4 K, and its joint efficiency was about 95 percent. (3) The fracture toughness of the weld metal was about 240 MPa\(\sqrt m \) at 4 K, a value higher than that of the base metal. (4) The results, on a laboratory scale, suggest that the EB welding process is suitable for welding the 22Mn-13Cr-5Ni-0.22N austenitic stainless steel.
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