| 摘要 |
PROBLEM TO BE SOLVED: To provide a filler metal manufacturing method capable of manufacturing a filler metal suitable for welding a double tube in which a surface layer formed of a hard-to-work material is formed on an inner face or an outer face of a base tube at a low cost. SOLUTION: The first filler metal manufacturing method comprises a welding step of forming a weld layer 12 on an outer face of a cylindrical base member 10 by using a plasma powder welding method, a separating step of separating the cylindrical weld layer 12 by removing the base member 10, and a working step of cutting out a ring-shaped filler metal 14 from the weld layer 12. The second filler metal manufacturing method comprises a welding step of forming a recessed groove 30a on the surface of a base member 30, and forming a weld layer 32 in a recessed groove 30a by using the plasma powder welding method, and a separating step of separating the bar-shaped weld layer 32 from the base member 30. COPYRIGHT: (C)2006,JPO&NCIPI
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