| 摘要 |
PURPOSE:To prevent a crack from being generated in a welded portion by inserting an insert member made of a non-magnetic copper alloy between a copper cap and a copper main body in an assembling work, followed by laser welding. CONSTITUTION:Superconductors 1 are contained in a recess of a copper main body 3 made of oxygen free copper, which is molded in a rectangular shape, followed by immersing in a melting solder tank. Gaps between the superconductors 1 are filled with solder for fixture. A solder surface of the copper main body 3 is cut in order to insert a copper cap 4 made of oxygen free copper. The inside at the tip end of the copper main body 3 is machined to form a space for inserting an insert member. The copper cap 4 and the insert member are disposed in the copper main body, followed by irradiation of a laser beam by a YAG laser device, for welding. The surface of the welded portion is polished. A black epoxy cation electrodeposition coating material is applied over the whole surface of a complex superconductor, thus forming an Insulating layer 6. |
