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1. 发明专利

JPH10339041A METHOD AND DEVICE FOR REPAIRING STRUCTURE IN NUCLEAR REACTOR 失效
公开(公告)号：JPH10339041A
公开(公告)日：1998-12-22
申请号：JP15188897
申请日：1997-06-10
申请人： HITACHI LTD
发明人： URASHIRO KEIICHI , OKAMURA HISANOBU , MATSUMOTO TOSHIMI , SATSUTA HISATAKA , NAKAMURA MITSUO , KONUMA AKIRA , KONUMA TSUTOMU , KATO TAKAHIKO , TAMAI YASUKATA , MORISAWA JUNICHIRO , SUZUKI KUNIHIKO
IPC分类号： E04G23/02 , B23K9/00 , B23K11/00 , B23K20/12 , G21C13/00 , G21C19/02
摘要： PROBLEM TO BE SOLVED: To prevent generation of cracks in a joined part by fixing a covering plate to a structure in which a crack-shaped defect is generated, flowing the current while the pressure is locally applied, and achieving the joining with the generated resistance heat to reduce the heating time during the execution. SOLUTION: A covering plate 3 is installed on a structure 2, and fixed by a fixing jig 24. A power source, a transformer 12, etc., are installed above the water level, and the execution is remotely achieved using a slide mechanism 26 where an arm 28 or an electrode 10 is movable in a horizontal/vertical direction. A support pillar 27 is fixed above the water level to form a pressure supporting part. The pressure is applied to a contact part of the covering plate 3 immediately below the electrode 10 with the structure 2 by a pressure applying mechanism 14, energization is achieved under the pressure, and a joined part 15 is formed through local fusing by the resistance heat. After one joining is completed, the electrode 10 is successively moved to form continuously joined parts. The resistance welding may be achieved using a rotary electrode. A series of executions are monitored by a monitoring mechanism. Development of cracks attributed to the stress corrosion, etc., can be prevented thereby.

2. 发明专利

JPH1015677A METHOD FOR HEATING AND REMELTING WELDED STRUCTURE, AND DEVICE USED THEREFOR 失效
公开(公告)号：JPH1015677A
公开(公告)日：1998-01-20
申请号：JP17204096
申请日：1996-07-02
申请人： HITACHI LTD
发明人： URASHIRO KEIICHI , NAKAMURA MITSUO , KONUMA AKIRA , KONUMA TSUTOMU , KASUYA TADASHI , TAMAI YASUKATA
IPC分类号： B23K31/00 , B23K26/352 , C21D1/34 , C21D1/38 , C21D9/00 , B23K26/00
摘要： PROBLEM TO BE SOLVED: To obtain a welded structure having uniform characteristic in a melting part and high structural reliability by making heating energy to be applied to a rewelding part smaller than the heating energy to be applied to a part other than the welded part at the time of rewelding the welded part. SOLUTION: In the case of causing cracking defect near the welded metal part 2 in the structure, the irradiation is executed while moving a laser beam 6 along the cracking detect to execute repairing welding. At this time, there is possibility that the surface of the welded metal part 2 of the structure is melted by a part of the repair welding part 24. In this case, only at the time of passing the laser beam 6 through the surface of the welded metal part 2 of the structure, the heating energy to be applied to the welded metal part surface of the energy density per unit area is made smaller than the heating energy to be applied to the part other than the welded metal part of the energy density per unit area. Thus, the repairing welded part having almost equal welded width and depth to the base member is formed in the welded part.

3. 发明专利

JPH08103882A UNDERWATER LASER BEAM MACHINING EQUIPMENT AND UNDERWATER EXECUTION METHOD USING THE EQUIPMENT 失效
公开(公告)号：JPH08103882A
公开(公告)日：1996-04-23
申请号：JP24100294
申请日：1994-10-05
申请人： HITACHI LTD
发明人： URASHIRO KEIICHI , SATSUTA HISATAKA , KONUMA AKIRA , NAKAMURA MITSUO , KONUMA TSUTOMU , MATSUMOTO TOSHIMI , TAMAI YASUKATA , YAMAUCHI HIROSHI , HAYASHI EISAKU , MORINAKA TADASHI
IPC分类号： G21C19/02 , B23K9/00 , B23K26/00 , B23K26/03 , B23K26/064 , B23K26/067 , B23K26/082 , B23K26/12 , B23K26/14 , B23K26/142 , B23K26/352 , B23K37/00 , C21D1/09 , C21D9/00 , C22C38/00 , C22C38/50 , G21F9/30 , B23K26/02 , B23K26/06 , B23K26/08
摘要： PURPOSE: To provide an underwater laser beam machining equipment which machines an underwater structure with high efficiency and with high quality by providing a partition wall between a chamber with one end opened to an external environment and a chamber housing a laser torch, and opening/closing the partition. CONSTITUTION: A chamber 2 is closely attached to the surface of a structure 1. The part of the chamber 2 in contact with the surface of the structure is closely attached and prevents water from entering from the periphery. Then, the water in the chamber in contact with the surface of the structure is discharged by a water discharging mechanism 16 and a gas injecting mechanism 15 to realize the gaseous atmosphere. A shield plate 12 is opened by a shield plate driving mechanism to integrate the chamber. Access is made to a laser torch 6. The position of the laser torch 6 and the distance from the laser torch to the structure surface are set in an appropriate condition by a laser beam irradiating part monitoring mechanism 19 or a distance monitoring mechanism 18. The structure surface is irradiated with the laser beam emitted from a laser beam oscillator and transmitted through the optical fiber 10.

4. 发明专利

JPH081375A FLUID EQUIPMENT 失效
公开(公告)号：JPH081375A
公开(公告)日：1996-01-09
申请号：JP15824794
申请日：1994-06-17
申请人： HITACHI LTD
发明人： USAMI KENICHI , TAKAYASU HIROSHI , KONUMA TSUTOMU , KARITA MAKOTO
IPC分类号： F03B3/02 , B23K9/04 , B23K35/30
摘要： PURPOSE:To provide a fluid equipment where the work hardenability is improved, the corrosion resistance is excellent, the matrix is stabilized and micronized, and the cavitation resistance is excellent by forming a clad layer by welding of the austenitic steel containing a specific composition on the surface of the fluid equipment made of 13 Cr martensitic stainless steel. CONSTITUTION:In a fluid equipment to be used for the river water or sea water, the clad layer by welding made of austenitic steel having the composition consisting of, by weight, 0.10-0.30% C, >=1% Se,

5. 发明专利

JPH064198B2 失效
公开(公告)号：JPH064198B2
公开(公告)日：1994-01-19
申请号：JP2989188
申请日：1988-02-10
申请人： HITACHI LTD
发明人： YANOKURA YUKIO , SASADA YASUHIRO , KONUMA TSUTOMU , TAMAI YASUKATA
IPC分类号： B23K26/21 , B23K15/00 , B23K26/32 , B23K26/00

6. 发明专利

JPH0578737A METHOD FOR HEAT TREATING AUSTENITIC STAINLESS STEEL BY LASER AND APPARATUS THEREFOR 失效
公开(公告)号：JPH0578737A
公开(公告)日：1993-03-30
申请号：JP24187691
申请日：1991-09-20
申请人： HITACHI LTD
发明人： KUROSAWA KOICHI , URASHIRO KEIICHI , AONO YASUHISA , FUNAMOTO TAKAO , KONUMA TSUTOMU , AOTA KINYA , ARAYA TAKESHI , TAMAI YASUKATA , TSUJIMURA HIROSHI , SAITO HIDEYO
IPC分类号： C21D1/09 , C21D6/00 , C23C26/00
摘要： PURPOSE:To obtain a surface modified layer and a surface alloy layer whose corrosion resistance is excellent even in the operation in water simliar to that in the operation in the air by locally forming the laser beam irradiated part into a cavity. CONSTITUTION:In the heat treatment of an austenitic stainless steel using a laser beam 29 in water, a metallic test piece 27 put in water in a tank is irradiated with a laser beam oscillated from a laser beam oscillator 1 via a condenser a laser torch 5. The irradiated part of the laser beam 29 is formed into an air space 32 by a fluid bulkhead jet 28 formed by high pressure water from a water inlet nozzle 13 and a high pressure gas from a shield gas feed hose 18, and in the state of the local air, heat treatment by a laser is executed. By rapid heating and rapid cooling by the irradiation of the laser beam 29, the modification of the surface layer is executed. Furthermore, the whole face in the moving direction of the laser beam 29 is coated with metallic powder, and the laser beam 29 is irradiated to form an alloy layer excellent in corrosion resistance.

7. 发明专利

JPS6471582A PIPE JOINT FOR JOINING HIGH CORROSION RESISTING STAINLESS STEEL-ZIRCONIUM AND ITS MANUFACTURE 失效
公开(公告)号：JPS6471582A
公开(公告)日：1989-03-16
申请号：JP22636187
申请日：1987-09-11
申请人： HITACHI LTD , ASAHI CHEMICAL IND
发明人： KONUMA TSUTOMU , SASADA YASUHIRO , TAGO HISAO
IPC分类号： B23K20/00 , B23K20/08 , F16L13/00
摘要： PURPOSE:To improve the strength and corrosion resistance of a pipe joint by carrying out explosive cladding first and second tubular members made of stainless steel and Zr or a Zr alloy with Ta as intermediate material. CONSTITUTION:The Ta pipe is fitted on the outside of the stainless steel pipe whose inside is filled and solidified tightly by a medium such as an asphalt compound and further, the Zr or Zr alloy pipe is fitted on the outside thereof. Next, the three pipes are arranged with uniform clearances and explosives are charged on the outside periphery of the outside Zr or Zr alloy pipe to carry out explosive formation. After the edges of the triple pipes are cut, the stainless steel of the one side edge and Ta and Zr layers of the other side end are further cut to the necessary length to obtain the pipe joint. By this method, there is no intermetallic compound formed on a joining part and joining is firmly carried out. Accordingly, the strength and corrosion resistance of the pipe joint are improved.

8. 发明专利

JPS63270445A SEDIMENT WEAR RESISTANT STEEL 失效
公开(公告)号：JPS63270445A
公开(公告)日：1988-11-08
申请号：JP10194087
申请日：1987-04-27
申请人： HITACHI LTD
发明人： SATO KOJI , KONUMA TSUTOMU , MATSUMOTO TOSHIMI , TAKAYASU HIROSHI , KIKUCHI KEIZO
IPC分类号： C22C38/00 , C22C38/52 , C22C38/58
摘要： PURPOSE:To obtain a sediment wear resistant steel suitable as a hydraulic turbine for sediment contg. place by specifying the compsn. consisting of C, Si, Mn, Ni, Co, Cr, Mo, N and Fe. CONSTITUTION:The titled steel consists of a metallic material contg., by weight 0.05-0.2% C, >=2% Si, 7-20% Mn, 2-10% Ni, 6-13% Co, 17-30% Cr, 1-3% Mo and 0.05-0.3% N, regulated with 0.6-1.3% said (Mn+Co)/Cr and consisting of the balance Fe with inevitable impurities and has an austenite or austenite + ferrite structure. The steel is used by forming it onto the surface of a member to be subjected to sediment wear. The formation on the surface of said member is preferably performed by build up welding. The titled steel is applied to a running water member of a hydraulic turbine for sediment contg. places, etc., by which the sediment wear resistance is improved, the lowering of the efficiency of the apparatus is decreased and the service life thereof is improved.

9. 发明专利

JPS6343463B2 失效
公开(公告)号：JPS6343463B2
公开(公告)日：1988-08-30
申请号：JP18043480
申请日：1980-12-22
申请人： HITACHI LTD
发明人： HATAYA FUMIO , KONUMA TSUTOMU , AKATSU YASUYUKI
IPC分类号： C22C38/00 , B23K9/04 , B23K35/30 , C22C38/58

10. 发明专利

JPS62179877A DIFFUSED JUNCTION METHOD FOR STAINLESS STEEL AND TI 失效
公开(公告)号：JPS62179877A
公开(公告)日：1987-08-07
申请号：JP2012586
申请日：1986-02-03
申请人： HITACHI LTD
发明人： TAKAYASU HIROSHI , KONUMA TSUTOMU , OGURA SATOSHI
IPC分类号： B23K20/00
摘要： PURPOSE:To improve the nitric acid resistance and strength on the joining part of the container in which the nitric acid of high concentration exists by providing the intermediate material which forms the total rate solid solution with stainless steel to the stainless steel side and the intermediate material which forms the total rate solid solution with both intermediate products of Ti and stainless steel side on the Ti side and joining both intermediate materials. CONSTITUTION:This invention is a method to prevent the generation of the reduction in the mechanical property and reduction in local nitric acid resistance due to the existance of the various intermetallic compounds which are formed at the vicinity of the junction part in case of joining SUS 304L base metal and Ti base metal. Namely in case of performing the diffused junction of SUS 304L of the base metal 1 and the Ti of the base metal 2, the diffused junction is performed with the prescribed joining temp., pressure, joining time and degree of vacuum by interposing V at the SUS 304L side of the base metal 1 and Mo at the Ti side of the base metal 2 respectively, taking into consideration of the formation of the intermetallic compound. In this way it can be restrained that the intermetallic compound compound which is in fear of its weakness and the reduction in the nitric acid resistance is generated on the junction part.

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