| 摘要 |
PROBLEM TO BE SOLVED: To provide a joined structure composed of a difficult-to-weld pipe made of stainless steel, etc. and a difficult-to-weld pipe made of titanium, etc., which member is excellent in the strength and gas-tightness. SOLUTION: The tip end of either one of a first pipe made of stainless steel, nickel alloy or carbon steel or a second pipe made of titanium, tantalum or zirconium is formed to be concave, and the tip end of the other pipe is formed to be convex. The tip ends of both pipes are joined by fitting the convex portion into the concave portion. The length of the convex portion is formed to be longer than the depth of the concave portion. An annular groove portion formed by fitting both tip ends is brazed by silver soldering. A sleeve made of the same pipe material as the first pipe or the second pipe is fitted on the fitted portion so as to position the brazed portion at a center. When the sleeve is made of the same pipe as the second pipe, the first pipe and the tip end of the sleeve on the first pipe side are brazed by silver soldering, and the second pipe and the tip end of the sleeve on the second pipe side are welded. When the sleeve is made of the same pipe material as the first pipe, the first pipe and the tip end of the sleeve on the first pipe side are welded, and the second pipe and the tip end of the sleeve on the second pipe side are brazed by silver soldering. COPYRIGHT: (C)2006,JPO&NCIPI |
