| 摘要 |
<p>PURPOSE:To enable it to prevent any deep creases due to buckling deformation from occurring by interposing a plate between an outer tube and an inner tube, forming a partial clad tube by means of hot hydrostatic pressure compressive processing, and molding it into a T form through hot form molding, then cutting the tip of a central branch tube. CONSTITUTION:An inner tube 3 is eccentrically inserted into an outer tube 2, a plate 4 is interposed between them along a tube axis, welding is applied to each end face of the outer tube 2, the inner tube 3 and the plate 4 and, after an interval between tube walls is deaerated and sealed up, hot hydrostatic pressure compression takes place, and solid phase diffusion welding is performed, thereby manufacturing a clad tube 1. A thick-wall part 10 of this clad tube 1 is situated on an oval long diametral line and pressurized, forming a projection 11 at the central part, and a top part of the projection 11 and both ends of the deformed tube are cut off, forming it into an almost T type. A jig 6 is passed through in the tube, and an inner diameter of the tube is trued up into a specified size. In consequence, any possible crease is preventable from occurring.</p> |
