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1. 发明专利

JP2002001533A CONTINUOUS MULTILAYER WELDING METHOD 失效
公开(公告)号：JP2002001533A
公开(公告)日：2002-01-08
申请号：JP2000183116
申请日：2000-06-19
申请人： NIPPON STEEL CORP
发明人： KASUYA TADASHI , HASHIBA YUJI , KOYAMA KUNIO
IPC分类号： B23K9/095 , B23K103/04
摘要： PROBLEM TO BE SOLVED: To provide a continuous multilayer welding method for improving mechanical characteristics of a welding joint by appropriately controlling a welding heat history by adjusting welding conditions in the method for conducting continuous multilayer welding under such conditions that length of a weld part is short and deterioration in the mechanical characteristics of the weld part due to temperature rise between weld passes easily occurs. SOLUTION: In this continuous multilayer welding method which continuously conducts multilayer welding on a steel material having a plate thickness of 30 mm or less using welding wire with the amount of welding heat input of 1.5-5.0 kJ/mm, length of the weld part of the steel material is 150 mm or more, protrusion length of the wire is 25-45 mm, welding current density is 200-35 0A/mm2, a wire diameter is 1.2-1.6 mm, and a nozzle tip end position is within a range of 0-10 mm from the contact tip end.

2. 发明专利

JP2000204436A WELDED STEEL PIPE EXCELLENT IN WEATHERABILITY 失效
公开(公告)号：JP2000204436A
公开(公告)日：2000-07-25
申请号：JP564199
申请日：1999-01-12
申请人： NIPPON STEEL CORP
发明人： TERADA YOSHIO , TAKAMOTO TERUHISA , KOYAMA KUNIO , USAMI AKIRA
IPC分类号： B23K9/18 , B23K9/00 , B23K9/23 , B23K35/30 , B23K101/06 , C22C38/00 , C22C38/16 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To impart excellent weatherability in the seaside district to steel pipe by producing it by a steel pipe base material having a specified componential compsn. applied with Ni-Cu components and a weld metal having a specified componential compsn. in which the contents of C, P, S and Ni are limited to proper ranges. SOLUTION: A welded steel pipe having a base material contg., by weight, 0.3 to 0.15% C,

3. 发明专利

JPH09277054A PRODUCTION OF WELD JOINT EXCELLENT IN SSC RESISTANCE 失效
公开(公告)号：JPH09277054A
公开(公告)日：1997-10-28
申请号：JP11710396
申请日：1996-04-16
申请人： NIPPON STEEL CORP
发明人： KASUYA TADASHI , OKITA SHIGERU , KOYAMA KUNIO
IPC分类号： B23K9/23 , B23K9/095 , C22C38/00
摘要： PROBLEM TO BE SOLVED: To obtain the joint excellent in SSC resistance by using a weld metal specifying tensile strength and alternately forming the weld bead directing from the center of groove to the groove width direction in a multi-layer welded joint. SOLUTION: In a multi-layer weld joint having weld bead of three line or more at final layer, a weld metal having a tensile strength of 40-60kgf/mm is used for the final layer. In the final layer, a first bead in the layer is formed at the groove center, successively, weld bead is alternately formed from the groove center toward both ends of groove. In the composition of a base metal of steel, a carbon equivalent obtained by the equation is desirably is 0.17-0.24%. By this selection of weld metal and welding condition, even though a condition of HAZ hardness of ⊖v248 is not satisfied, the joint not having SSC can be obtained.

4. 发明专利

JPH08108282A METHOD FOR WELDING STEEL, AND MANUFACTURE OF STEEL 失效
公开(公告)号：JPH08108282A
公开(公告)日：1996-04-30
申请号：JP26812994
申请日：1994-10-07
申请人： NIPPON STEEL CORP
发明人： YURIOKA NOBUTAKA , TOSHIMA SADAO , KOYAMA KUNIO
IPC分类号： B23K9/173 , B21B15/00 , B23K9/18 , B23K9/235
摘要： PURPOSE: To improve the efficiency of the arc welding of steel, and to provide an excellent large steel structure member with improved quality of the heat- affected zone. CONSTITUTION: The steel of 800-1400 deg.C in temperature and 10-200mm in thickness is welded by the gas shielded arc welding method or the submerged arc welding method with the condition of 10-60mm in the groove root face, and 3-30kJ/mm in the heat input. The steel of high temperature can be efficiently welded by the large heat input welding, and the amount of the welding material can be reduced. The steel whose weld zone is assimilated to the base metal can be obtained by rolling the welded steel.

5. 发明专利

JPH07323380A WELDING METHOD FOR STEEL 失效
公开(公告)号：JPH07323380A
公开(公告)日：1995-12-12
申请号：JP12141894
申请日：1994-06-02
申请人： NIPPON STEEL CORP
发明人： HORII YUKIHIKO , KOYAMA KUNIO , KASUYA TADASHI
IPC分类号： B23K9/23 , B23K9/00 , B23K25/00
摘要： PURPOSE:To improve tenacity and to prevent cracks of a welding zone of a high strength extra thick steel by providing partitions in a welding space to form plural spaces, welding each portion and thereby minimizing heat input for welding. CONSTITUTION:Two steels 1, 1a each of which has the thickness of 33mm or more are oppositely faced at 13 to 30mm apart; two sheets of patches 2, 2a are attached in the manner of enclosing the steels; at least one or more partitions 3 are provided at 13 to 100mm spaces apart to form plural spaces 4; and these plural spaces 4 are each welded by nonconsumable nozzle type electroslag welding. In addition, in a welding for attaching a diaphragm 6 to a steel 5 at 13 to 30mm apart in a box column using the 30 to 150mm thick steel 5 with the tensile strength of 570MPa or more and a 33 to 150mm thick diaphragm 6, the partitions 3 are similarly provided to form plural spaces 4, and these plural spaces 4 are each welded by nonconsumable electroslag welding. Thus, the tenacity of a welding zone is improved which is problematic in a high strength steel, and a residual stress is reduced.

6. 发明专利

JPH05200587A MANUFACTURE OF COMPOSITE WIRE FOR WELDING 失效
公开(公告)号：JPH05200587A
公开(公告)日：1993-08-10
申请号：JP1144592
申请日：1992-01-24
申请人： NIPPON STEEL CORP
发明人： HORII YUKIHIKO , KOYAMA KUNIO
IPC分类号： B21C1/00 , B23K35/02 , B23K35/40
摘要： PURPOSE:To provide the manufacturing method of the composite welding wire of the job production which is the stable quality and the efficient manufacturing process even if it is the product of small lot, about the theme of the improvement of quality and the reduction of manufacturing cost for the welding wire using to the steel welding. CONSTITUTION:Over three layers of the stock of over two kinds of different component are lapped, and joined, then the hot treatment is executed and next the wire drawing is executed.

7. 发明专利

JPH0211281A COUPLING METHOD BY ELECTRON BEAM WELDING FOR SQUARE STEEL PIPE BY STEEL PLATE ASSEMBLY WELDING 失效
公开(公告)号：JPH0211281A
公开(公告)日：1990-01-16
申请号：JP16069288
申请日：1988-06-30
申请人： NIPPON STEEL CORP
发明人： TOKUDA TADAAKI , OKITA SHIGERU , KOYAMA KUNIO
IPC分类号： B23K15/00
摘要： PURPOSE:To obtain sound coupling by allowing an electron beam to penetrate a joining part of each square steel pipe, and also, executing non-through welding so that the tip of the electron beam is brought to stop in a backing metallic plate, and executing steel plate assembly welding for removing an end tab. CONSTITUTION:In the case of bringing end parts of square steel pipes 3A, 3B to electron beam welding, with respect to the square steel plates 3A, 3B provided with a backing metallic plate 4 and an end tab 7, an electron gun is moved from a position opposed to the lower end tab to a position opposed to the upper end tab, and also, the electron beam is allowed to penetrate a joining part, and electron beam non-through welding is executed so that the tip of the electron beam is brought to stop in the backing metallic plate 4. Subsequently, the square steel pipe provided with the backing metallic plate 4 and the end tab is turned by 90 deg., and thereafter, the electron gun is moved from the slant face of the lower end tab to the slant face of the upper end tab, the electron beam is allowed to penetrate the joining part, and also, the electron beam non-through welding is executed so that the tip of the beam is brought to stop in the backing metallic plate 4.

8. 发明专利

JPS6431597A PRODUCTION OF GRANULE TYPE WELDING FLUX 失效
公开(公告)号：JPS6431597A
公开(公告)日：1989-02-01
申请号：JP18725987
申请日：1987-07-27
申请人： NIPPON STEEL CORP
发明人： NAGANUMA HIROSHI , KOYAMA KUNIO , OYAMA SHIGEO
IPC分类号： B23K35/40 , B23K35/362
摘要： PURPOSE:To produce a granular type welding flux having small hygroscopicity by molding a flux contg. a material which is specified in viscosity and combustion and sublimation temp. and an oxide and fluoride specified in grain size respectively at specific ratios to granules. CONSTITUTION:The material (polyvinyl alcohol, etc.) which has >= 0.05poise viscosity in granulation environment and burns or sublimates at >= 90oC and = 1wt.% and = 2 kinds among the oxides and fluorides having = lwt.% and

9. 发明专利

JPS6315060B2 失效
公开(公告)号：JPS6315060B2
公开(公告)日：1988-04-02
申请号：JP21548882
申请日：1982-12-10
申请人： NIPPON STEEL CORP
发明人： NAKANO TAKETO , KISHI TADAO , KOYAMA KUNIO
IPC分类号： B22D11/10 , B22D11/103 , B22D11/108 , B22D11/11 , B22D11/111 , B22D11/20

10. 发明专利

JPS62275548A CONTINUOUSLY CAST BILLET OF METAL AND ITS CASTING METHOD 失效
公开(公告)号：JPS62275548A
公开(公告)日：1987-11-30
申请号：JP11625086
申请日：1986-05-22
申请人： NIPPON STEEL CORP
发明人： KOYAMA KUNIO
IPC分类号： B22D11/04 , B22D11/047
摘要： PURPOSE:To obtain a cast billet without any surface defect as reducing the defect caused by cold shut mark (CSM) by existing CSM in the cast billet toward billet drawing direction from the billet surface, in case of casting as connecting with a brake ring between a tundish and mold. CONSTITUTION:Under condition of existing CSM 6 toward the cast billet drawing direction A from the billet 5 surface, angle theta between the solidified metal 5 and the mold 4 is increased, and molten metal 2 is easily flowed in to prevent the development of recess part. The above cast billet having CSM 6 is cast, for example, under using the brake ring having notch part 7 on the face brought into contact with the inner face of the mold 4. That is, the solidification of the molten metal 2 progresses from the contact face with the mold and the brake ring. Therefore, the solidified metal 5 is formed as wedge-shaped and CSM becomes to exist the billet drawing direction from the billet surface.

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