Patents by Inventor Shugo Hirota
Shugo Hirota 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: 11491571Abstract: An arc welding method is described where pulse arc welding is performed with a welding wire being fed in a forward direction during a first period and short-circuit transfer arc welding is performed with the welding wire being fed in the forward direction and a reverse direction during a second period. The arc welding method alternately switches between the first period and the second period, where the switching of the first period to the second period is performed during a peak period of the pulse arc welding.Type: GrantFiled: September 17, 2019Date of Patent: November 8, 2022Assignee: DAIHEN CorporationInventors: Kento Takada, Tetsuo Era, Shugo Hirota, Toshiaki Nakamata
-
Patent number: 11491570Abstract: An arc welding method includes the following steps. Pulse arc welding is performed with the welding wire being fed in a forward direction during a first period. Short-circuit transfer arc welding is performed with the welding wire being fed in the forward direction and the reverse direction during a second period. The first period and the second period are alternately switched. The switching of the first period to the second period is performed in a manner such that no transfer of a molten droplet of the welding wire occurs during the final pulse cycle of the first period.Type: GrantFiled: August 12, 2019Date of Patent: November 8, 2022Assignee: DAIHEN CorporationInventors: Kento Takada, Tetsuo Era, Shugo Hirota, Toshiaki Nakamata
-
Publication number: 20220266373Abstract: An arc start adjustment device adjusting an arc start procedure in a welding process comprises an obtainment unit that obtains welding data indicating a welding state during or after a welding process, and a procedure adjustment unit that adjusts the arc start procedure such that the cycle time of the welding process is shortened based on welding data obtained by the obtainment unit.Type: ApplicationFiled: February 24, 2022Publication date: August 25, 2022Inventors: Shinichiro Nakagawa, Shugo Hirota
-
Publication number: 20220203472Abstract: An arc start adjustment device adjusting an arc start procedure in a welding process comprises an obtainment unit that obtains welding data indicating a welding state during or after a welding process, and a procedure adjustment unit that adjusts the arc start procedure such that the cycle time of the welding process is shortened based on welding data obtained by the obtainment unit.Type: ApplicationFiled: March 17, 2022Publication date: June 30, 2022Inventors: Shinichiro Nakagawa, Shugo Hirota
-
Patent number: 11292072Abstract: An arc start adjustment device adjusting an arc start procedure in a welding process comprises an obtainment unit that obtains welding data indicating a welding state during or after a welding process, and a procedure adjustment unit that adjusts the arc start procedure such that the cycle time of the welding process is shortened based on welding data obtained by the obtainment unit.Type: GrantFiled: October 26, 2018Date of Patent: April 5, 2022Assignee: DAIHEN CorporationInventors: Shinichiro Nakagawa, Shugo Hirota
-
Publication number: 20200254553Abstract: An arc welding method includes: performing pulse arc welding with a welding wire being fed in a forward direction during a first period; performing short-circuit transfer arc welding with the welding wire being fed in the forward direction and a reverse direction during a second period; and alternately switching between the first period and the second period. The switching of the first period to the second period is performed during a peak period of the pulse arc welding.Type: ApplicationFiled: September 17, 2019Publication date: August 13, 2020Inventors: Kento TAKADA, Tetsuo ERA, Shugo HIROTA, Toshiaki NAKAMATA
-
Publication number: 20200254552Abstract: An arc welding method includes the following steps. Pulse arc welding is performed with the welding wire being fed in a forward direction during a first period. Short-circuit transfer arc welding is performed with the welding wire being fed in the forward direction and the reverse direction during a second period. The first period and the second period are alternately switched. The switching of the first period to the second period is performed in a manner such that no transfer of a molten droplet of the welding wire occurs during the final pulse cycle of the first period.Type: ApplicationFiled: August 12, 2019Publication date: August 13, 2020Inventors: Kento TAKADA, Tetsuo ERA, Shugo HIROTA, Toshiaki NAKAMATA
-
Publication number: 20190160578Abstract: An arc start adjustment device adjusting an arc start procedure in a welding process comprises an obtainment unit that obtains welding data indicating a welding state during or after a welding process, and a procedure adjustment unit that adjusts the arc start procedure such that the cycle time of the welding process is shortened based on welding data obtained by the obtainment unit.Type: ApplicationFiled: October 26, 2018Publication date: May 30, 2019Inventors: Shinichiro Nakagawa, Shugo Hirota
-
Patent number: 8440934Abstract: To start consumable electrode arc welding, an initial current is supplied to a welding wire after causing the welding wire to contact a base material and retracting the welding wire from the base material. Thereby, an initial arc is generated. The welding wire is retracted continuously for an initial arc lift period Ti with the initial arc maintained. Afterwards, the initial arc is switched to a steady arc. A predetermined weld pool formation period Tp is set after the initial arc lift period Ti. In the weld pool formation period, a weld pool formation current greater than the initial current is supplied with the initial arc maintained and the welding wire is caused to proceed and fed to the base material. In the weld pool formation period, a weld pool is formed by the initial arc without allowing the welding wire to release droplets and contact the base material.Type: GrantFiled: October 14, 2008Date of Patent: May 14, 2013Assignee: Daihen CorporationInventors: Shugo Hirota, Tetsuo Era, Tomoyuki Ueyama
-
Patent number: 8383986Abstract: An arc start control method in robot welding includes the steps of shorting a welding wire with a base metal, retracting a welding torch by a welding robot for taking the welding wire off the base metal to generate an initial arc, retracting the welding torch to a predetermined position with maintaining the initial arc maintained while applying an initial arc current smaller than a steady welding current during this initial arc period, and starting to feed the welding wire steadily and to supply the steady welding current so as to make a transition from the initial arc to a steady arc as well as starting to move the welding torch along a welding line. During a re-shorting prevention period which starts from a beginning of the initial arc period, a re-shorting prevention current which is larger than the initial arc current is applied in order to prevent re-shortening between the wire tip and the base metal right after the initial arc was generated. Thereafter, the initial arc current is applied.Type: GrantFiled: July 26, 2006Date of Patent: February 26, 2013Assignee: DAIHEN CorporationInventors: Toshiro Uezono, Tetsuo Era, Tomoyuki Ueyama, Shugo Hirota
-
Patent number: 8362397Abstract: An arc start control method comprises starting advance of a welding wire, and determining that a distal end of a welding wire contacts a base material and short circuit is caused. If a feed torque value is a reference torque value or greater, the welding wire is retracted and the distal end of the welding wire is separated from the base material without generating an arc. If the feed torque value is smaller than the reference torque value the welding wire is retracted and the distal end of the welding wire is separated from the base material and an initial arc is generated between the welding wire and the base material.Type: GrantFiled: November 21, 2008Date of Patent: January 29, 2013Assignee: Daihen CorporationInventor: Shugo Hirota
-
Patent number: 8338750Abstract: A control method for AC pulse arc welding performed upon application of cyclic AC welding current is provided. The welding current has a cycle including an electrode negative polarity period and an electrode positive polarity period subsequent to the electrode negative polarity period. In the control method, an electrode negative polarity base current and a subsequent electrode negative polarity peak current are applied during the electrode negative polarity period. The electrode negative polarity base current has an absolute value smaller than a first critical value, and the electrode negative polarity peak current has an absolute value greater than the first critical value. Then, an electrode positive polarity peak current is applied during the electrode positive polarity period. The electrode positive polarity peak current has a value greater than a second critical value.Type: GrantFiled: December 17, 2009Date of Patent: December 25, 2012Assignee: DAIHEN CorporationInventors: Hideo Shiozaki, Futoshi Nishisaka, Norihito Takahashi, Toshiro Uezono, Hiroyasu Mondori, Shugo Hirota, Shinichiro Nakagawa, Tomoyuki Ueyama
-
Publication number: 20100213181Abstract: An arc start control method comprises starting advance of a welding wire, and determining that a distal end of a welding wire contacts a base material and short circuit is caused. If a feed torque value is a reference torque value or greater, the welding wire is retracted and the distal end of the welding wire is separated from the base material without generating an arc. If the feed torque value is smaller than the reference torque value the welding wire is retracted and the distal end of the welding wire is separated from the base material and an initial arc is generated between the welding wire and the base material.Type: ApplicationFiled: November 21, 2008Publication date: August 26, 2010Applicant: Daihen CorporationInventor: Shugo Hirota
-
Publication number: 20100193486Abstract: To start consumable electrode arc welding, an initial current is supplied to a welding wire after causing the welding wire to contact a base material and retracting the welding wire from the base material. In this manner, an initial arc is generated. The welding wire is retracted continuously for an initial arc lift period Ti with the initial arc maintained. Afterwards, the initial arc is switched to a steady arc. A predetermined weld pool formation period Tp is set after the initial arc lift period Ti. In the weld pool formation period, a weld pool formation current greater than the initial current is supplied with the initial arc maintained and the welding wire is caused to proceed and fed to the base material. In the weld pool formation period, a weld pool is formed by the initial arc without allowing the welding wire to release droplets and contact the base material. By this method, the initial arc is switched to the steady arc state after the weld pool has been formed.Type: ApplicationFiled: October 14, 2008Publication date: August 5, 2010Applicant: DAIHEN CORPORATIONInventors: Shugo Hirota, Tetsuo Era, Tomoyuki Ueyama
-
Publication number: 20100155383Abstract: A control method for AC pulse arc welding performed upon application of cyclic AC welding current is provided. The welding current has a cycle including an electrode negative polarity period and an electrode positive polarity period subsequent to the electrode negative polarity period. In the control method, an electrode negative polarity base current and a subsequent electrode negative polarity peak current are applied during the electrode negative polarity period. The electrode negative polarity base current has an absolute value smaller than a first critical value, and the electrode negative polarity peak current has an absolute value greater than the first critical value. Then, an electrode positive polarity peak current is applied during the electrode positive polarity period. The electrode positive polarity peak current has a value greater than a second critical value.Type: ApplicationFiled: December 17, 2009Publication date: June 24, 2010Applicant: DAIHEN CORPORATIONInventors: Hideo SHIOZAKI, Futoshi Nishisaka, Norihito Takahashi, Toshiro Uezono, Hiroyasu Mondori, Shugo Hirota, Shinichiro Nakagawa, Tomoyuki Ueyama
-
Publication number: 20070023407Abstract: An arc start control method in robot welding includes the steps of shorting a welding wire with a base metal, retracting a welding torch by a welding robot for taking the welding wire off the base metal to generate an initial arc, retracting the welding torch to a predetermined position with maintaining the initial arc maintained while applying an initial arc current smaller than a steady welding current during this initial arc period, and starting to feed the welding wire steadily and to supply the steady welding current so as to make a transition from the initial arc to a steady arc as well as starting to move the welding torch along a welding line. During a re-shorting prevention period which starts from a beginning of the initial arc period, a re-shorting prevention current which is larger than the initial arc current is applied in order to prevent re-shortening between the wire tip and the base metal right after the initial arc was generated. Thereafter, the initial arc current is applied.Type: ApplicationFiled: July 26, 2006Publication date: February 1, 2007Applicant: DAIHEN CorporationInventors: Toshiro Uezono, Tetsuo Era, Tomoyuki Ueyama, Shugo Hirota