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1. 发明专利

JP2004148334A Method for enhancing fatigue strength of lap joint 审中-公开
公开(公告)号：JP2004148334A
公开(公告)日：2004-05-27
申请号：JP2002314393
申请日：2002-10-29
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： FURUSAKO SEIJI , KOBAYASHI JUNICHI
IPC分类号： B23K26/00 , B23K26/20 , B23K26/32 , B23K103/04
摘要： PROBLEM TO BE SOLVED: To provide a method for enhancing the fatigue strength of a laser-welded lap weld joint with steel plates overlapped and laser-welded. SOLUTION: In a lap joint in which two steel plates having no plated layer on a face layer overlap in the vertical direction, and an overlapped portion is laser-welded, the thickness of the steel plate is set to be 0.6-4.0 mm, and a gap g (mm) between the upper and lower steel plates is set to be 0.05-0.15 mm. COPYRIGHT: (C)2004,JPO

2. 发明专利

JP2003290950A Laser welding method for high tension steel plate 有权
标题翻译：高张力钢板激光焊接方法
公开(公告)号：JP2003290950A
公开(公告)日：2003-10-14
申请号：JP2002098773
申请日：2002-04-01
申请人： Nippon Steel Corp , 新日本製鐵株式会社
发明人： MIYAZAKI YASUNOBU , FURUSAKO SEIJI , HAMAYA HIDEKI , NONAKA TOSHIKI , OKAMOTO TSUTOMU , TANIGUCHI YUICHI , KOBAYASHI JUNICHI
IPC分类号： B23K26/00 , B23K26/14 , B23K26/20 , B23K103/04
摘要： PROBLEM TO BE SOLVED: To provide a welding method that can prevent a weld joint from being softened, in a high tension steel plate with an HT value in excess of 0.007. SOLUTION: In the laser welding method for a high tension steel plate in which the HT value in the following (1) equation exceeds 0.007, the method is characterized in that the welding speed is set at 1.0 m/min or faster and that a cooling means is provided which is for cooling the temperature rising portion of the steel plate 1 including proximity to a point 3 to be irradiated with a laser beam. HT=(1+4C-0.1Si-0.1Mn-Nb-Mo)/(Hv(M)-Hv(BM)) (1) provided that C, Si, Mn, Nb and Mo are the content (mass %) of each element, that Hv(M) is the Vickers hardness when the steel plate becomes a full martensite, and that Hv(BM) is the Vickers hardness of the steel plate. As the cooling means, there are used a cooling plate 10, cooling gas 17, cooling liquid 18 and cooling mist 19. COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：提供一种HT值超过0.007的高压钢板中可以防止焊接接头软化的焊接方法。解决方案：在以下（1）式中的HT值超过0.007的高压钢板的激光焊接方法中，其特征在于，将焊接速度设定为1.0m / min以上，提供了一种用于冷却钢板1的升温部分的冷却装置，包括靠近要用激光束照射的点3。 HT =（1 + 4C-0.1Si-0.1Mn-Nb-Mo）/（Hv（M）-Hv（BM））（1）C，Si，Mn，Nb和Mo的含量（质量％的Hv（M）是钢板变成全马氏体时的维氏硬度，Hv（BM）是钢板的维氏硬度。作为冷却装置，使用冷却板10，冷却气体17，冷却液18和冷却雾19.版权所有（C）2004，JPO

3. 发明专利

JP2003117660A METHOD FOR RESISTANCE WELDING OF HYDROFORMING COMPONENT AND HYDROFORMING COMPONENT FOR RESISTANCE WELDING 审中-公开
公开(公告)号：JP2003117660A
公开(公告)日：2003-04-23
申请号：JP2001313570
申请日：2001-10-11
申请人： NIPPON STEEL CORP
发明人： OIKAWA HATSUHIKO , HIROSHIGE ITSURO , KOBAYASHI JUNICHI
IPC分类号： B23K11/00 , B23K11/14 , B23K103/04
摘要： PROBLEM TO BE SOLVED: To obtain a reliable joint by forming a stable nugget at a weld zone in a resistance welding of a hydroforming component. SOLUTION: In the resistance welding of the hydroforming component, the deformation of the weld zone of the hydroforming component is suppressed and the contacting condition is kept excellent by using a hydroforming component on which a projection is formed, and the nugget is stably formed. Thus another component and the hydroforming component are stably welded. Preferably, the plate thickness of the hydroforming component is 2.6 mm or smaller. Further, the projection has a diameter of 2 mm or greater and 7 mm or smaller, and a height of 0.5 mm or greater and 1.5 mm or smaller.

4. 发明专利

JP2002003952A MANUFACTURING METHOD AND MANUFACTURING FACILITY ALIGNMENT OF STEEL PLATE FOR DEEP DRAWING 失效
公开(公告)号：JP2002003952A
公开(公告)日：2002-01-09
申请号：JP2000179588
申请日：2000-06-15
申请人： NIPPON STEEL CORP
发明人： NAKAMURA TAKAAKI , WAKITA JUNICHI , KOBAYASHI JUNICHI
IPC分类号： B21B3/00 , C21D9/48 , C22C38/00 , C22C38/14
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing a steel plate of excellent deep drawing property by reliably removing a surface sheared layer, and facility alignment thereof. SOLUTION: Steel is rough-rolled at or above the Ar3 transformation temperature in a hot rolling step of the steel having a predetermined composition, a plurality of recessed dents are formed in the width direction on one side or on both sides of the steel plate simultaneously with the rough rolling or before the finish rolling is started, and the finish rolling of at least two passes is implemented while entrapping liquid in the recessed dents in the temperature range between the Ar3 transformation temperature and 650 deg.C, and the steel plate of excellent deep drawing property is manufactured after the re- crystallization. A dent forming device provided between a roughing mill and a finish rolling mill is arranged as the manufacturing facility train.

5. 发明专利

JP2001321984A FILLER WIRE FOR WELDING OF HOT STEEL PLATE 失效
公开(公告)号：JP2001321984A
公开(公告)日：2001-11-20
申请号：JP2000137526
申请日：2000-05-10
申请人： NIPPON STEEL CORP
发明人： NAKAMURA TAKAAKI , KOBAYASHI JUNICHI , ASO YOSUKE
IPC分类号： B21B15/00 , B23K35/30
摘要： PROBLEM TO BE SOLVED: To provide a filler wire for welding of hot steel plates which prevents the joint part rupture during hot rolling after joining by suppressing weld defects and preventing the degradation in the strength of the joint parts. SOLUTION: The filler wire for supplying the butt parts containing 0.03 to 5.0% B by mass % can suppress the S embrittlement which occurs in heat affected zones in hot bar joining of joining the tail ends of the preceding materials and the front ends of succeeding materials of the sheet bars for hot rolling and successively passing these material through finish rolling mills in a hot rolling process step. Further, the solidification cracking and embrittlement of the weld zones may be suppressed by incorporating 0.03 to 1.5% C, =4.0% therein.

6. 发明专利

JPH11104838A WELDING JOINT FOR STRUCTURAL STEEL EXCELLENT IN FATIGUE STRENGTH 失效
公开(公告)号：JPH11104838A
公开(公告)日：1999-04-20
申请号：JP28314597
申请日：1997-10-01
申请人： NIPPON STEEL CORP
发明人： SETO KOJI , OMIYA SHINICHI , KAYAMORI YOICHI , KOBAYASHI JUNICHI
IPC分类号： F16L13/02 , B23K9/23 , B23K31/00 , C22C38/00
摘要： PROBLEM TO BE SOLVED: To stably provide a weld joint improving fatigue strength. SOLUTION: At a position of =26 to

7. 发明专利

JPH10110540A METHOD OF REPAIRING BOX COLUMN OF STEEL CONSTRUCTION 失效
公开(公告)号：JPH10110540A
公开(公告)日：1998-04-28
申请号：JP28163496
申请日：1996-10-04
申请人： NIPPON STEEL CORP
发明人： FURUYA HITOSHI , INOUE TAKEHIRO , KOBAYASHI JUNICHI
IPC分类号： E04B1/24 , B23K9/00 , B23K31/00 , E04G23/02
摘要： PROBLEM TO BE SOLVED: To prevent a weld crack by using new material composed of vertically bisected small members. SOLUTION: At the time of repairing a damaged part 3 with a crack generated in a box column 1 of steel construction, the damaged part 3 is cut and eliminated from a sound part, and then new material of box column shape with dimensions corresponding to the damaged part 3 is inserted between the end faces of the sound part. The end faces of the new material are then welded to the end faces of the sound part opposed to the upper and lower end faces of the new material. In this case, the new material is formed of small members 4, 5 of box column shape vertically divided at least in two parts. The end faces of the new material and the end faces of the sound part are welded first, and then the end faces of the small members 4, 5 of the new material are welded to each other.

8. 发明专利

JPH0967643A WELDED JOINT EXCELLENT IN FATIGUE STRENGTH AND WELDING METHOD THEREFOR 失效
公开(公告)号：JPH0967643A
公开(公告)日：1997-03-11
申请号：JP3038696
申请日：1996-02-19
申请人： NIPPON STEEL CORP
发明人： SETO KOJI , OMIYA SHINICHI , KAYAMORI YOICHI , KOBAYASHI JUNICHI , SOYA ISAO
IPC分类号： B23K9/23 , B23K9/00 , B23K31/00 , C21D9/50 , C22C38/00 , C22C38/04 , C22C38/54
摘要： PROBLEM TO BE SOLVED: To provide a welded joint excellent in fatigue strength by controlling preheating temp., weld heat input, and cooling velocity after welding, respectively, and forming retained austenite in the joint, at the time of welding a structural steel. SOLUTION: A structural steel with 590-950MPa tensile strength, having a composition containing, by weight ratio, 0.10-0.45% C, 0.5-3.0% Si, 0.2-2.5% Mn, and other proper alloying elements, such as Ni, Cr, and Mo, is welded. At this time, a joint, in which the structure of the heat-affected zone heated to a temp. not lower than the Ac1 transformation point and lower than the melting point consists of 5=20vol.% of retained austenite and the balance one or >=2 kinds among ferrite, pearlite, bainite, and martensite, is formed. Moreover, this structure can be obtained by preheating the weld seam of a steel material to 350-500 deg.C, applying shielded metal arc welding or gas-shielded metal- arc welding at (3000 to 20000)J/cm heat input, and then performing air cooling for >=15sec after the completion of welding or water cooling at a rate of (40 to 100) deg.C/S after 15sec-15min from the completion of welding.

9. 发明专利

JPH08176724A HIGH TENSILE STEEL HAVING EXCELLENT WELDING COLD CRACK RESISTANCE AND PRODUCTION THEREOF 失效
公开(公告)号：JPH08176724A
公开(公告)日：1996-07-09
申请号：JP32338994
申请日：1994-12-26
申请人： NIPPON STEEL CORP
发明人： AIHARA SHUJI , KOBAYASHI JUNICHI
IPC分类号： C21D8/00 , C21D9/00 , C22C38/00 , C22C38/38 , C22C38/58
摘要： PURPOSE: To obtain a tempered high tensile steel capable of preventing welding cold cracking by controlling the Ti content in the high tensile steel having a specific compsn. and dispersing Ti oxide into the steel. CONSTITUTION: The chemical compsn. of the steel is composed, by weight%, of 0.03 to 0.20% C, 0.1 to 2.0% Si; 0.5 to 3.0% Mn,

10. 发明专利

JPH0453929B2 失效
公开(公告)号：JPH0453929B2
公开(公告)日：1992-08-28
申请号：JP28412487
申请日：1987-11-12
申请人： NIPPON STEEL CORP
发明人： YANO SEINOSUKE , OKAMURA YOSHIHIRO , KAKO KATSUO , KOBAYASHI JUNICHI
IPC分类号： C21D8/02 , C22C38/00 , C22C38/08 , C22C38/16

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