Patents by Inventor Daniel Anthony Nowak
Daniel Anthony Nowak 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).
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Patent number: 9416671Abstract: A bimetallic ring for use as a turbine shroud in a gas turbine engine. The bimetallic ring forms a sealing surface as a hot gas flow path boundary in the engine. The ring is comprised of two materials. The first material, a wrought, oxidation resistant metal alloy comprises a first portion, which is the hot gas flow path sealing surface. The second material, a low cost low alloy steel, comprises a second portion that may be at least a pair of supporting side plates. A dissimilar weld joint joins the sealing surface to the second portion, the at least pair of supporting side plates.Type: GrantFiled: October 4, 2012Date of Patent: August 16, 2016Assignee: General Electric CompanyInventors: Bill Damon Johnston, Daniel Anthony Nowak, Srikanth Chandrudu Kottilingam, Melbourne J Myers, Joe Timothy Nowak
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Patent number: 9095923Abstract: A method of welding alloys having a ductility drop temperature range to limit strain-age cracking. The method involves the use of a welding device to weld a weld area of an article while maintaining temperatures throughout the weld area and a heat affected zone adjacent the weld area within a non-crack sensitive temperature range that is above a ductility drop temperature range of the alloy being welded. During welding, the temperatures of the weld area and the heat affected zone are predominantly controlled with heat input from the welding device. Once the welding has been terminated, the weld area and the heat affected zone are cooled from the non-crack sensitive temperature range through the ductility drop temperature range to a temperature below the ductility drop temperature range of the alloy.Type: GrantFiled: July 16, 2012Date of Patent: August 4, 2015Assignee: General Electric CompanyInventors: Yan Cui, Daniel Anthony Nowak, Srikanth Chandrudu Kottilingam, Brian Lee Tollison, Dechao Lin
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Publication number: 20150158273Abstract: A powder metallurgical article and process are disclosed. The article is a repaired or enlarged powder metallurgical article. The repaired or enlarged powder metallurgical article includes a formed article including a first alloy and a material including a second alloy. The material is welded to the formed article to form the repaired or enlarged powder metallurgical article. The repaired or enlarged powder metallurgical article includes a substantially uniform grain structure.Type: ApplicationFiled: February 19, 2015Publication date: June 11, 2015Inventors: Daniel Anthony NOWAK, Raymond Joseph STONITSCH, Attila SZABO
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Patent number: 8974614Abstract: A powder metallurgical article and process are disclosed. The article is a repaired or enlarged powder metallurgical article. The repaired or enlarged powder metallurgical article includes a formed article including a first alloy and a material including a second alloy. The material is welded to the formed article to form the repaired or enlarged powder metallurgical article. The repaired or enlarged powder metallurgical article includes a substantially uniform grain structure.Type: GrantFiled: January 4, 2010Date of Patent: March 10, 2015Assignee: General Electric CompanyInventors: Daniel Anthony Nowak, Raymond Joseph Stonitsch, Attila Szabo
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Patent number: 8950695Abstract: Disclosed is a fuel nozzle and a process of fabricating a fuel nozzle. The fuel nozzle includes a fuel nozzle end cover and a fuel nozzle insert. The fuel nozzle insert is welded to the fuel nozzle end cover by a welding process selected from the group consisting of beam welding, solid state welding, and combinations thereof and/or the fuel nozzle insert includes a first fuel nozzle insert portion and a second fuel nozzle insert portion. The process includes welding the fuel nozzle insert to the fuel nozzle end cover.Type: GrantFiled: January 12, 2012Date of Patent: February 10, 2015Assignee: General Electric CompanyInventors: Bill Damon Johnston, Daniel Anthony Nowak, Srikanth Chandrudu Kottilingam
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Patent number: 8809724Abstract: Process for reducing cracking in superalloy metal components by selectively growing large single grains during the casting operation at a region where fusion welding will be required.Type: GrantFiled: August 4, 2008Date of Patent: August 19, 2014Assignee: General Electric CompanyInventors: Srikanth Chandrudu Kottilingam, Doyle Clyde Lewis, Daniel Anthony Nowak, Matthew D. Collier, Jian Zheng, Lawrence James Whims
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Patent number: 8726599Abstract: A fatigue load resistant structure includes a fatigue loaded portion and a weldable fatigue loading resistant feature. The fatigue loaded portion includes a first elongation material. The weldable fatigue loading resistant feature includes a second elongation material secured to the fatigue loaded portion of the fatigue loaded structure. The first elongation material is less ductile than the second elongation material, and the weldable fatigue loading resistant feature can reduce, retard, or eliminate formation of cracks due to tensile and compressive forces.Type: GrantFiled: January 4, 2010Date of Patent: May 20, 2014Assignee: General Electric CompanyInventors: Daniel Anthony Nowak, Srikanth Chandrudy Kottilingam, Bill Damon Johnston
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Publication number: 20140099194Abstract: A bimetallic ring for use as a turbine shroud in a gas turbine engine. The bimetallic ring forms a sealing surface as a hot gas flow path boundary in the engine. The ring is comprised of two materials. The first material, a wrought, oxidation resistant metal alloy comprises a first portion, which is the hot gas flow path sealing surface. The second material, a low cost low alloy steel, comprises a second portion that may be at least a pair of supporting side plates. A dissimilar weld joint joins the sealing surface to the second portion, the at least pair of supporting side plates.Type: ApplicationFiled: October 4, 2012Publication date: April 10, 2014Applicant: GENERAL ELECTRIC COMPANYInventors: Bill Damon JOHNSTON, Daniel Anthony NOWAK, Srikanth Chandrudu KOTTILINGAM, Melbourne J. MYERS, Joe Timothy NOWAK
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Publication number: 20140014628Abstract: A method of welding alloys having a ductility drop temperature range to limit strain-age cracking. The method involves the use of a welding device to weld a weld area of an article while maintaining temperatures throughout the weld area and a heat affected zone adjacent the weld area within a non-crack sensitive temperature range that is above a ductility drop temperature range of the alloy being welded. During welding, the temperatures of the weld area and the heat affected zone are predominantly controlled with heat input from the welding device. Once the welding has been terminated, the weld area and the heat affected zone are cooled from the non-crack sensitive temperature range through the ductility drop temperature range to a temperature below the ductility drop temperature range of the alloy.Type: ApplicationFiled: July 16, 2012Publication date: January 16, 2014Applicant: GENERAL ELECTRIC COMPANYInventors: Yan Cui, Daniel Anthony Nowak, Srikanth Chandrudu Kottilingam, Brian Lee Tollison, Dechao Lin
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Publication number: 20130205789Abstract: Disclosed is a fuel nozzle end cover, a fuel nozzle and a process of fabricating a fuel nozzle end cover. The fuel nozzle end cover includes a base material and one or more features extending from the base material into a cavity of the fuel nozzle end cover. The one or more features are secured to the base material by a process selected from the group consisting of beam welding, friction welding, gas tungsten arc welding, gas metal arc welding, and combinations thereof. The fuel nozzle includes a fuel nozzle insert and a fuel nozzle end cover. The process of fabricating the fuel nozzle end cover includes providing a base material and securing one or more features to the base material by a welding process selected from the group consisting of beam welding, friction welding, gas tungsten arc welding, gas metal arc welding, and combinations thereof.Type: ApplicationFiled: February 9, 2012Publication date: August 15, 2013Applicant: GENERAL ELECTRIC COMPANYInventors: Bill Damon JOHNSTON, Daniel Anthony NOWAK, Srikanth Chandrudu KOTTILINGAM, Amit MONGA, Brian Lee TOLLISON, John Greg OBEIRNE
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Publication number: 20130181071Abstract: Disclosed is a fuel nozzle and a process of fabricating a fuel nozzle. The fuel nozzle includes a fuel nozzle end cover and a fuel nozzle insert. The fuel nozzle insert is welded to the fuel nozzle end cover by a welding process selected from the group consisting of beam welding, solid state welding, and combinations thereof and/or the fuel nozzle insert includes a first fuel nozzle insert portion and a second fuel nozzle insert portion. The process includes welding the fuel nozzle insert to the fuel nozzle end cover.Type: ApplicationFiled: January 12, 2012Publication date: July 18, 2013Applicant: GENERAL ELECTRIC COMPANYInventors: Bill Damon Johnston, Daniel Anthony Nowak, Srikanth Chandrudu Kottilingam
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Patent number: 8371817Abstract: A turbine bucket that includes a pressure side, a suction side opposite the pressure side, and a rib extending between the pressure side and the suction side. A tip cap is attached to the pressure side and the suction side and covers the rib. The tip cap includes a precipitation hardened material and a passage aligned with the rib. A method for assembling a turbine bucket having a pressure side and a suction side and a rib extending between the pressure side and suction side. The method includes receiving a tip cap made from a precipitation hardened material and having a passage in the tip cap. The method further includes locating the rib visually through the passage and aligning the passage with the rib. The method also includes welding the tip cap to the turbine bucket and to the rib.Type: GrantFiled: September 15, 2009Date of Patent: February 12, 2013Assignee: General Electric CompanyInventors: Gitahi Charles Mukira, Daniel Anthony Nowak, Michael Douglas Arnett, Srikanth Chandrudu Kottilingam
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Patent number: 8319148Abstract: A system and method for laser beam welding at least two adjacent superalloy components involves substantially simultaneous formation of a base weld with a first filler metal placed between the components and cap weld with second filler metal formed over the base weld. A shim is inserted between the components, which may optionally be formed with a groove along the joint surface. A filler wire is fed to a location over the given surface or within the optional groove. Two lasers or a laser and coupled beam splitter supply first and second laser beams that are applied at focal points separated by a predetermined distance (e.g., 0.05-1.5 cm). The first laser beam is used to form a base weld with the first filler metal between the components, and the second laser beam is used to form a cap weld with the second filler metal on top of the base weld.Type: GrantFiled: August 20, 2009Date of Patent: November 27, 2012Assignee: General Electric CompanyInventors: Daniel Anthony Nowak, Michael Douglas Arnett, Srikanth Chandrudu Kottilingam
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Patent number: 8253060Abstract: A welding method and apparatus for welding workpieces together by conducting a laser beam welding process on a joint region that includes a weld seam defined by and between faying surfaces of the workpieces, and then conducting a hybrid laser arc welding process on the joint region. The laser beam welding process entails causing a first laser beam to travel along the joint region, penetrate the weld seam and form a weldment. The hybrid laser arc welding process remelts the weldment by simultaneously causing an electric arc and a second laser beam to overlap and travel along the joint region and form a weld pool in the weldment. On cooling, a weld joint is formed within the joint region and its weld seam.Type: GrantFiled: June 30, 2010Date of Patent: August 28, 2012Assignee: General Electric CompanyInventors: Daniel Anthony Nowak, Paul Stephen DiMascio
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Patent number: 8253061Abstract: A welding method and apparatus for welding workpieces together by conducting a forward hybrid welding process on a joint region that includes a weld seam defined by and between faying surfaces of the workpieces, and then conducting an aft hybrid welding process on the joint region. The forward hybrid welding process simultaneously causes a forward laser beam and a forward electric arc to travel along the joint region, which in combination penetrates the weld seam and forms a weld pool that solidifies to form a weldment. The aft hybrid welding process utilizes an aft electric arc and an aft laser beam to produce a second weld pool that remelts and mixes with the weldment. On cooling, a weld joint is formed that is capable of deeply penetrating the weld seam of the joint region.Type: GrantFiled: July 7, 2010Date of Patent: August 28, 2012Assignee: General Electric CompanyInventors: Daniel Anthony Nowak, Srikanth Chandrudu Kottilingam
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Patent number: 8163047Abstract: A method of cooling hot fluid flowing through a chamber is provided. The method includes channeling cooling fluid through at least one cooling tube that extends through a passage of the chamber, and circulating the hot fluid flowing within the passage around the at least one cooling tube using at least one fluid diverter.Type: GrantFiled: January 10, 2007Date of Patent: April 24, 2012Assignee: General Electric CompanyInventors: George Albert Goller, Daniel Anthony Nowak
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Publication number: 20120006795Abstract: A welding method and apparatus for welding workpieces together by conducting a forward hybrid welding process on a joint region that includes a weld seam defined by and between faying surfaces of the workpieces, and then conducting an aft hybrid welding process on the joint region. The forward hybrid welding process simultaneously causes a forward laser beam and a forward electric arc to travel along the joint region, which in combination penetrates the weld seam and forms a weld pool that solidifies to form a weldment. The aft hybrid welding process utilizes an aft electric arc and an aft laser beam to produce a second weld pool that remelts and mixes with the weldment. On cooling, a weld joint is formed that is capable of deeply penetrating the weld seam of the joint region.Type: ApplicationFiled: July 7, 2010Publication date: January 12, 2012Applicant: GENERAL ELECTRIC COMPANYInventors: Daniel Anthony Nowak, Srikanth Chandrudu Kottilingam
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Publication number: 20120000892Abstract: A welding method and apparatus for welding workpieces together by conducting a laser beam welding process on a joint region that includes a weld seam defined by and between faying surfaces of the workpieces, and then conducting a hybrid laser arc welding process on the joint region. The laser beam welding process entails causing a first laser beam to travel along the joint region, penetrate the weld seam and form a weldment. The hybrid laser arc welding process remelts the weldment by simultaneously causing an electric arc and a second laser beam to overlap and travel along the joint region and form a weld pool in the weldment. On cooling, a weld joint is formed within the joint region and its weld seam.Type: ApplicationFiled: June 30, 2010Publication date: January 5, 2012Applicant: GENERAL ELECTRIC COMPANYInventors: Daniel Anthony Nowak, Paul Stephen DiMascio
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Publication number: 20110164989Abstract: A fatigue load resistant structure includes a fatigue loaded portion and a weldable fatigue loading resistant feature. The fatigue loaded portion includes a first elongation material. The weldable fatigue loading resistant feature includes a second elongation material secured to the fatigue loaded portion of the fatigue loaded structure. The first elongation material is less ductile than the second elongation material, and the weldable fatigue loading resistant feature can reduce, retard, or eliminate formation of cracks due to tensile and compressive forces.Type: ApplicationFiled: January 4, 2010Publication date: July 7, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Daniel Anthony NOWAK, Srikanth Chandrudy KOTTILINGAM, Bill Damon JOHNSTON
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Publication number: 20110165432Abstract: A powder metallurgical article and process are disclosed. The article is a repaired or enlarged powder metallurgical article. The repaired or enlarged powder metallurgical article includes a formed article including a first alloy and a material including a second alloy. The material is welded to the formed article to form the repaired or enlarged powder metallurgical article. The repaired or enlarged powder metallurgical article includes a substantially uniform grain structure.Type: ApplicationFiled: January 4, 2010Publication date: July 7, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Daniel Anthony NOWAK, Raymond Joseph STONITSCH, Attila SZABO