Patents by Inventor Terumi Nakamura
Terumi Nakamura has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 11393969Abstract: [Object] To provide a thermoelectric generation cell using a safe and inexpensive general-purpose thermoelectric material.Type: GrantFiled: February 27, 2018Date of Patent: July 19, 2022Assignee: National Institute for Materials ScienceInventors: Seisuke Nigo, Terumi Nakamura, Susumu Meguro, Seiichi Kato
-
Publication number: 20210202817Abstract: [Object] To provide a thermoelectric generation cell using a safe and inexpensive general-purpose thermoelectric material.Type: ApplicationFiled: February 27, 2018Publication date: July 1, 2021Inventors: Seisuke NIGO, Terumi NAKAMURA, Susumu MEGURO, Seiichi KATO
-
Patent number: 9643284Abstract: A welding wire is formed from a hoop having an inner surface and formed from a metal material, a core wire having a surface and formed from a metal material, and an alkaline metal compound. The hoop metal material and the core wire metal material are different from each other. A composition of the welding wire is divided into the hoop metal material and the core wire metal material. The alkaline metal compound is disposed between the inner face of the hoop and the surface of the core wire. An amount of the alkaline metal compound is from more than 10 ppm to 1000 ppm based on a weight of the welding wire.Type: GrantFiled: February 27, 2013Date of Patent: May 9, 2017Assignee: NATIONAL INSTITUTE FOR MATERIALS SCIENCEInventors: Terumi Nakamura, Kazuo Hiraoka
-
Patent number: 8884190Abstract: A pair of thick steel plates are set up side by side such that an I groove with a narrow gap is formed between the facing edges of the plates, and a welding wire projecting from a welding torch of an arc welding unit with a constant voltage characteristic is inserted into the I groove obliquely from above with respect to the thickness direction of the plates. The welding torch is moved vertically while the distal end of the welding wire is caused to reciprocate inside the I groove in the thickness direction. At this time, the wire feed rate Vf is varied and also the extension L of the welding wire is increased or decreased so as to keep welding current Iw at a target value. Further, the wire feed rate Vf is subjected to incremental/decremental correction according to the moving direction of the torch.Type: GrantFiled: January 7, 2008Date of Patent: November 11, 2014Assignees: IHI Corporation, National Institute for Materials ScienceInventors: Terumi Nakamura, Noboru Kiji, Toru Iljima
-
Publication number: 20140079471Abstract: The invention is a welding method capable of controlling an arc heat distribution on a groove face of a base metal, which comprises increasing or decreasing the melting rate of a welding wire relative to the feeding rate of the welding wire by changing the characteristic of an arc current to thereby change an arc generating position of a fusing end of the welding wire, wherein an AC arc welding operation is performed by changing the polarity of the welding wire as the characteristic of the arc current; and a welded joint structure formed by the welding method.Type: ApplicationFiled: November 4, 2013Publication date: March 20, 2014Applicants: Ishikawajima-Harima Heavy Industries Co., Ltd., National Research Institute For MetalsInventors: Kazuo HIRAOKA, Terumi NAKAMURA
-
Publication number: 20130034384Abstract: The invention is a welding method capable of controlling an arc heat distribution on a groove face of a base metal, which comprises increasing or decreasing the melting rate of a welding wire relative to the feeding rate of the welding wire by changing the characteristic of an arc current to thereby change an arc generating position of a fusing end of the welding wire, wherein an AC arc welding operation is performed by changing the polarity of the welding wire as the characteristic of the arc current; and a welded joint structure formed by the welding method.Type: ApplicationFiled: August 3, 2012Publication date: February 7, 2013Inventors: Kazuo Hiraoka, Terumi Nakamura
-
Publication number: 20110042365Abstract: The invention provides a welding system capable of freely controlling the dispersion and concentration of arc heat over the groove face with an extreamly narrow gap and a high strength and high quality welded joint structure which is formed by this welding system and which is capable of preventing softening/hardening of the structure, the lowering of the toughness thereof and the generation of a crack. According to the welding system, the melting rate of a welding wire is controlled relative to the welding wire feeding rate by changing the characteristic of an arc current so that the range of behavior and the transfer rate of the arc pole (the arc generating main point at a groove surface) are controlled. Further, the welded joint structure consists of a high strength steel having a superfine grain structure with a carbon equivalent of as low as less than 0.Type: ApplicationFiled: October 15, 2010Publication date: February 24, 2011Inventors: Kazuo HIRAOKA, Terumi Nakamura
-
Publication number: 20100133240Abstract: A method of consumable electrode type gas shield arc welding characterized in that a shield gas consisting of an inert gas is fed toward a consumable electrode and an addition gas consisting of a mixture of oxidizing gas and inert gas toward an outer edge of welding pool. Further, there is provided a welding torch for use in the method. Thus, in the welding of steel material in accordance with GMA welding technique, the dissolved oxygen concentration of the weld metal can be reduced to 100 ppm or less, and while maintaining arc stability, desirable bead formation can be attained.Type: ApplicationFiled: August 10, 2006Publication date: June 3, 2010Inventors: Makoto Takahashi, Toyoyuki Sato, Terumi Nakamura, Kazuo Hiraoka
-
Publication number: 20090039065Abstract: A plurality of metal materials to be a composition, without containing a flux, of a required welded portion are laminated in order to improve characteristics such as toughness of the welded portion and to carry out a stable welding operation. A welding wire enclosing an alkaline metal compound is used between the layers. The welding is carried out in a high-purity inert gas atmosphere.Type: ApplicationFiled: June 9, 2006Publication date: February 12, 2009Inventors: Terumi Nakamura, Kazuo Hiraoka
-
Publication number: 20080230526Abstract: The invention provides a welding system capable of freely controlling the dispersion and concentration of arc heat over the groove face with an extremely narrow gap and a high strength and high quality welded joint structure which is formed by this welding system and which is capable of preventing softening/hardening of the structure, the lowering of the toughness thereof and the generation of a crack. According to the welding system, the melting rate of a welding wire is controlled relative to the welding wire feeding rate by changing the characteristic of an arc current so that the range of behavior and the transfer rate of the arc pole (the arc generating main point at a groove surface) are controlled. Further, the welded joint structure consists of a high strength steel having a superfine grain structure with a carbon equivalent of as low as less than 0.Type: ApplicationFiled: March 7, 2008Publication date: September 25, 2008Inventors: Kazuo Hiraoka, Terumi Nakamura
-
Publication number: 20080210677Abstract: A pair of thick steel plates are set up side by side such that an I groove with a narrow gap is formed between the facing edges of the plates, and a welding wire projecting from a welding torch of an arc welding unit with a constant voltage characteristic is inserted into the I groove obliquely from above with respect to the thickness direction of the plates. The welding torch is moved vertically while the distal end of the welding wire is caused to reciprocate inside the I groove in the thickness direction. At this time, the wire feed rate Vf is varied and also the extension L of the welding wire is increased or decreased so as to keep welding current Iw at a target value. Further, the wire feed rate Vf is subjected to incremental/decremental correction according to the moving direction of the torch.Type: ApplicationFiled: January 7, 2008Publication date: September 4, 2008Applicants: IHI Corporation, National Institute for Materials ScienceInventors: Terumi Nakamura, Noboru Kiji, Toru Iljima
-
Publication number: 20070012671Abstract: The invention provides a welding system capable of freely controlling the dispersion and concentration of arc heat over the groove face with an extreamly narrow gap and a high strength and high quality welded joint structure which is formed by this welding system and which is capable of preventing softening/hardening of the structure, the lowering of the toughness thereof and the generation of a crack. According to the welding system, the melting rate of a welding wire is controlled relative to the welding wire feeding rate by changing the characteristic of an arc current so that the range of behavior and the transfer rate of the arc pole (the arc generating main point at a groove surface) are controlled. Further, the welded joint structure consists of a high strength steel having a superfine grain structure with a carbon equivalent of as low as less than 0.Type: ApplicationFiled: September 25, 2006Publication date: January 18, 2007Inventors: Kazuo Hiraoka, Terumi Nakamura
-
Publication number: 20050098551Abstract: The invention provides a welding system capable of freely controlling the dispersion and concentration of arc heat over the groove face with an extreamly narrow gap and a high strength and high quality welded joint structure which is formed by this welding system and which is capable of preventing softening/hardening of the structure, the lowering of the toughness thereof and the generation of a crack. According to the welding system, the melting rate of a welding wire is controlled relative to the welding wire feeding rate by changing the characteristic of an arc current so that the range of behavior and the transfer rate of the arc pole (the arc generating main point at a groove surface) are controlled. Further, the welded joint structure consists of a high strength steel having a superfine grain structure with a carbon equivalent of as low as less than 0.Type: ApplicationFiled: December 23, 2004Publication date: May 12, 2005Inventors: Kazuo Hiraoka, Terumi Nakamura
-
Publication number: 20040065644Abstract: The invention provides a welding system capable of freely controlling the dispersion and concentration of arc heat over the groove face with an extreamly narrow gap and a high strength and high quality welded joint structure which is formed by this welding system and which is capable of preventing softening/hardening of the structure, the lowering of the toughness thereof and the generation of a crack. According to the welding system, the melting rate of a welding wire is controlled relative to the welding wire feeding rate by changing the characteristic of an arc current so that the range of behavior and the transfer rate of the arc pole (the arc generating main point at a groove surface) are controlled. Further, the welded joint structure consists of a high strength steel having a superfine grain structure with a carbon equivalent of as low as less than 0.Type: ApplicationFiled: September 15, 2003Publication date: April 8, 2004Inventors: Kazuo Hiraoka, Terumi Nakamura
-
Patent number: 6653594Abstract: A gas having an arc current-voltage property that is different from a shielding gas is intermittently added to the shielding gas, an arc current is intermittently changed in proportion to an intermittent chemical composition change of the shielding gas at an arc generation region, and an arc generation point situated at a tip of a welding wire is displaced upwardly or downwardly along a groove of a base metal.Type: GrantFiled: February 28, 2001Date of Patent: November 25, 2003Assignees: Japan as represented by Director General of Ministry of Education, Culture, Sports, Science and Technology National Research Institute for Metals, Daihen Corporation, Nippon Sanso Corporation, Ishikawajima-Harima Heavy Industries Co., Ltd.Inventors: Terumi Nakamura, Kazuo Hiraoka, Chiaki Shiga, Hideyuki Yamamoto, Koji Nakamura
-
Publication number: 20020153363Abstract: The invention provides a welding system capable of freely controlling the dispersion and concentration of arc heat over the groove face with an extreamly narrow gap and a high strength and high quality welded joint structure which is formed by this welding system and which is capable of preventing softening/hardening of the structure, the lowering of the toughness thereof and the generation of a crack. According to the welding system, the melting rate of a welding wire is controlled relative to the welding wire feeding rate by changing the characteristic of an arc current so that the range of behavior and the transfer rate of the arc pole (the arc generating main point at a groove surface) are controlled. Further, the welded joint structure consists of a high strength steel having a superfine grain structure with a carbon equivalent of as low as less than 0.Type: ApplicationFiled: June 13, 2002Publication date: October 24, 2002Inventors: Kazuo Hiraoka, Terumi Nakamura
-
Publication number: 20010047988Abstract: The invention provides a welding system capable of freely controlling the dispersion and concentration of arc heat over the groove face with an extreamly narrow gap and a high strength and high quality welded joint structure which is formed by this welding system and which is capable of preventing softening/hardening of the structure, the lowering of the toughness thereof and the generation of a crack. According to the welding system, the melting rate of a welding wire is controlled relative to the welding wire feeding rate by changing the characteristic of an arc current so that the range of behavior and the transfer rate of the arc pole (the arc generating main point at a groove surface) are controlled. Further, the welded joint structure consists of a high strength steel having a superfine grain structure with a carbon equivalent of as low a less than 0.Type: ApplicationFiled: April 10, 2000Publication date: December 6, 2001Inventors: Kazuo Hiraoka, Terumi Nakamura
-
Publication number: 20010025832Abstract: A different kind of a gas in an arc current-voltage property from an shielding gas is intermittently added to the shielding gas, an arc current is intermittently changed in proportion to an intermittent chemical composition change of the shielding gas at an arc generation region, and an arc generation point situated at a tip of a welding wire is displaced upward or downward along a groove of a base metal.Type: ApplicationFiled: February 28, 2001Publication date: October 4, 2001Inventors: Terumi Nakamura, Kazuo Hiraoka, Chiaki Shiga, Hideyuki Yamamoto, Koji Nakamura
-
Patent number: 6297473Abstract: In order to provide a welding system capable of freely controlling dispersion and concentration of arc heat input at a groove face of base material, and ensure melting of the base material while restraining excessive weld heat input, in arc welding using a wire consumable electrode system, at a groove between members to be welded a position of a weld torch or feed speed of a wire is periodically varied, and welding is carried out by controlling a difference between the phase of the variation and a phase of an arc current waveform in accordance with a change in the arc current waveform.Type: GrantFiled: September 3, 1999Date of Patent: October 2, 2001Assignee: Japan as represented by Director General of National Research Institute for MetalsInventors: Kazuo Hiraoka, Terumi Nakamura, Hideyuki Yamamoto