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1. 发明专利

JPS5785683A PRODUCTION OF DOUBLEPLY PIPES 失效
公开(公告)号：JPS5785683A
公开(公告)日：1982-05-28
申请号：JP16201380
申请日：1980-11-19
申请人： KAWASAKI HEAVY IND LTD
发明人： YOSHIDA TOSHIO , ITOGA KOUSUKE
IPC分类号： F16L9/02 , B21C37/06 , B21D39/04 , B23K20/00
摘要： PURPOSE:To deform an inside pipe plastically in an early period, increase an elastic return difference of both pipes and increase the degree of fitting of the doubleply pipes by inserting the inside pipe into an outside pipe, applying pipe expanding force to the inside pipe, and applying compressive force in the axial direction of the inside pipe. CONSTITUTION:Jack plates 6', 6' are brought in abutment on the inside pipe 2 forced into an outside pipe 1, and are connected to jack rods 7, 7. On the other hand, water as pipe expanding liquid is supplied through a water feed path 8 provided to the plate 6' and is filled in the pipe 2. thence, compressive force is applied by the plates 6, 6' in the axial direction of the pipe 2, and circumferential pipe expanding force P lower in set amt. than axial compressive force T is applied successively. Then, the circumferential direction is yielded early by the axial compressive force and abuts on the pipe 1, thereby expanding the pipe integrally to a prescribed diameter. When the pressure is reduced after this, both inside and outside pipes reduce diameters elastically. At this time, the elastic return difference of the pipes 2, 1 is increased by the plastic deformation of the pipe 2, whereby a sufficient interference is obtained.

2. 发明专利

JPS56111588A RUST PREVENTING METHOD FOR LAMINATED BOUNDARY FACE NEAR PIPE END OF LAMINATED AUTOFRETTAGE DOUBLE PIPES 失效
公开(公告)号：JPS56111588A
公开(公告)日：1981-09-03
申请号：JP1243080
申请日：1980-02-06
申请人： KAWASAKI HEAVY IND LTD
发明人： YOSHIDA TOSHIO , ATSUTA TOSHIO , ITOGA KOUSUKE
IPC分类号： C23F15/00 , B21C37/00 , B21C37/06 , B23K9/23 , B23K31/00 , B23K37/02
摘要： PURPOSE:To prevent the corrosion of laminated face owing to external environments by welding laminated autofrettage double pipes from their pipe end exposed laminated part along the laminated face and metallurgically coupling both weld metals thereby shutting said pipe end part from the atmospheric air. CONSTITUTION:A thick-walled outer pipe 2 made of carbon steel 2 is inserted onto an inner pipe 1 consisting of, for example, a thin-walled pipe made of stainless steel, whereby laminated autofrettage double pipes 3 are made. Next, the end of these pipes 3 is formed to an oblique butt groove 4' by a suitable means such as mechanical cutting, after which the laminated boundary face 5 of the inner and outer pipes 1, 2 of the exposed faces is welded to a required depth along said face by electron beam welding, whereby it is metallurgically coupled by deposited metal 11. Even after the formation of the pipes (unit pipe) 3 formed in this way, the face 5 of the cut-exposed faces 4' coupled metallurgically by the metal 11 and is held tightly plugged, and therefore even if it is exposed to the atmosphere, there is no possibility for the inclusion of rust to the inner side of the face 5. Cracking, bubbling, etc. of the metal 11 do not occur either.

3. 发明专利

JPS55133885A PRODUCTION OF DOUBLE PIPE 失效
公开(公告)号：JPS55133885A
公开(公告)日：1980-10-18
申请号：JP4113279
申请日：1979-04-06
申请人： KAWASAKI HEAVY IND LTD
发明人： SUSEI SHIYUUZOU , ITOGA KOUSUKE
IPC分类号： B23K26/21 , B23K15/00
摘要： PURPOSE:To enable the double pipe which has firm integration function and has no distortions or the like to be obtained by mechanically pressure-welding inside and outside pipes then forming the metal bond through radiation beam welding partially along the axial direction. CONSTITUTION:An inside pipe 2 of stainless steel or the like and an outside pipe 3 of pressure-resistant steel or the like are pressure-welded at the faying parts 4. Beams are radiated to this double pipe 1 from the outside of the outside pipe 3 by means of electron beam welding or laser beam welding at the controlled welding width and depth of penetration to perform welding partially. At this time, the weld beads 5 melt so as to reach the faying parts 4 of the inside and outside pipes 2, 3 and further sufficiently enter the inside of the thickness of the inside pipe 3, to enable the metal bonding to be effected locally and continuously. This method makes it possible to accomplish firm bonding without giving any large welding strain to the double pipe and prevent deviation and local buckling.

4. 发明专利

JPS57194832A MANUFACTURE OF DOUBLE PIPE 失效
公开(公告)号：JPS57194832A
公开(公告)日：1982-11-30
申请号：JP7807781
申请日：1981-05-25
申请人： KAWASAKI HEAVY IND LTD
发明人： YOSHIDA TOSHIO , MATSUI SHIGEAKI , ITOGA KOUSUKE
IPC分类号： F16L9/02 , B21C37/06 , B23P11/02
摘要： PURPOSE:To stack inner and outer pipes easily and relatively, and to obtain the self-locking double pipe through the shrinkage of a diameter by naturally cooling the outer pipe by a method wherein the outer pipe is diameter-increased through heating, diameter-shrunk, yield-deformed and diameter-increased through the release of pipe shrinking force in a predetermined diameter. CONSTITUTION:The inside of the inner pipe 29 is filled with cooling water through a piping 24 to shrink its diameter. On the other hand, the inside of a pressure drum 11 is filled with hot water through a heater 16 from a water source 15, and the outer pipe 30 is heated to increase its diameter. A high pressure hydraulic cylinder 18 is actuated, and the outer pipe 30 is shrunk and plastically deformed. The outer pipe is subject to axial force through a sliding stopper 28 through the operation of an air cylinder 27, and also shrunk in the axial direction. After prescribed pipe shrinkage, heating water is discharged from the pressure drum to release pipe shrinking force, and the cooling water in the inner pipe 29 is also discharged. Accordingly, the outer pipe 30 is naturally cooled and shrunk, the inner pipe 29 is temperature-raised up to a natural temperature and diameter-increased, and the self-locking double pipe is obtained.

5. 发明专利

JPS5662692A DUPLICATE PIPE WELDING JOINT PART PROCESSING METHOD 失效
公开(公告)号：JPS5662692A
公开(公告)日：1981-05-28
申请号：JP13703179
申请日：1979-10-25
申请人： KAWASAKI HEAVY IND LTD
发明人： ATSUTA TOSHIO , ITOGA KOUSUKE
IPC分类号： B23K31/00 , B23K37/053
摘要： PURPOSE:To prevent generation of stress corrosion cracks in the duplicate pipe welding joint part, by generating compression residual stress in the inside pipe welding joint part having welding tensile residual stress after extending the joint part of the duplicate pipe beyond the elastic limit locally. CONSTITUTION:In the processing for welding joint part 4 of duplicate pipes 3 and 3 where austenite-system stainless steel pipe 1 is the inside pipe and carbon steel pipe 2 is the outside pipe, pipe extending stress is applied to set ring 6, which is inserted from aperture part 5 of a short pipe length and is set to welding part 4, rubber tube 8, and so on through the hydraulic cylinder, tube 7, and so on to cause pipe extending action to act upon inside pipe 1 and outside pipe 2, and after pipe extending beyond the elastic limit, compression residual stress is caused to generate in welding joint part 4 of inside pipe 1 having welding tensile residual stress on a basis of the difference of breakdown stress of pipes. Thus, stress corrosion cracks are prevented from being generated.

6. 发明专利

JPS57193292A TREATMENT FOR WELDED JOINT PART OF PIPE 失效
公开(公告)号：JPS57193292A
公开(公告)日：1982-11-27
申请号：JP7807681
申请日：1981-05-25
申请人： KAWASAKI HEAVY IND LTD
发明人： YOSHIDA TOSHIO , MATSUI SHIGETOMO , ITOGA KOUSUKE
IPC分类号： B23K31/00 , B23K31/02
摘要： PURPOSE:To prevent the generation of stress corrosion cracking in the welded joint parts of pipes by heating the surfaces thereof on the side not in contact with fluid quickly from an ordinary temp. and changing the diameter of the parts by liquid pressure before the other surface side heats up and generating residual compressive stresses after restoration of the ordinary temp. CONSTITUTION:A sleeve piston 3 is inserted into a pipe 1 connected by a welded joint 2, and a solenoid valve 7 is opened via a controller 6 to eject the steam of a boiler 8 through the nozzles 10 of steam heaters 5, whereby the entire circumference of the joint part 2 is quickly heated. The outside surface 1'' side of the part 2 is quickly heated and before the inside surface 1' side is heated from an ordinary temp., that is, while it has residual tensile stresses, the sealing damper rings 12, 12 of flange parts 4, 4 are brought into press contact with the inside surface 1' by the high pressure water from a high pressure water pump 13, whereby said surface is sealed. Liquid pressure is applied between the parts 4 and 4 through a passage 16 by a high pressure water pump 15 to expand the pipe and to yield the inside surface 1' side, whereby the pipe is elastically deformed. After restoration of the ordinary temp., residual compressive stresses are formed on the inside surface 1' side and residual tensile stresses on the outside surface 1'' side.

7. 发明专利

JPS5776392A Corrosion-proof transporting pipe joint 失效
标题翻译：防腐蚀运输管接头
公开(公告)号：JPS5776392A
公开(公告)日：1982-05-13
申请号：JP15016280
申请日：1980-10-28
申请人： Kawasaki Heavy Ind Ltd
发明人： YOSHIDA TOSHIO , ITOGA KOUSUKE , MATSUI SHIGETOMO , ATSUTA TOSHIO
IPC分类号： F16L15/00 , E21B17/02 , E21B17/042

8. 发明专利

JPS5776386A Manufacture of corrosion-proof double pipe joint 失效
标题翻译：防腐双管接头的制造
公开(公告)号：JPS5776386A
公开(公告)日：1982-05-13
申请号：JP15015580
申请日：1980-10-28
申请人： Kawasaki Heavy Ind Ltd
发明人： YOSHIDA TOSHIO , ITOGA KOUSUKE
IPC分类号： F16L15/00 , B23K20/12 , E21B17/02 , E21B17/042

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