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- Nachgewiesen in: USPTO Patent Grants
- Sprachen: English
- Patent Number: 11484,962
- Publication Date: November 01, 2022
- Appl. No: 16/078163
- Application Filed: February 27, 2017
- Assignees: Kobe Steel, Ltd. (Kobe, JP)
- Claim: 1. A welding torch which performs arc welding in a shielding gas atmosphere, the welding torch comprising: a contact tip that supports a welding wire which is supplied with a welding current while the welding wire is fed in a welding wire longitudinal direction toward a tip portion of the contact tip; a suction nozzle that surrounds a periphery of the welding wire protruded from the tip portion of the contact tip, and sucks a gas from a space formed between the suction nozzle and the welding wire; and a shielding gas supply nozzle that is provided on an outer periphery of the suction nozzle, and supplies the shielding gas toward a welded portion at a tip of the welding wire from a space formed between the shielding gas supply nozzle and the suction nozzle, wherein where a value of Lts [mm] is a positive distance along a direction of feeding the welding wire in the welding wire longitudinal direction, from the tip portion of the contact tip to a tip portion of the shielding gas supply nozzle, and Ltk [mm] is a positive distance along the direction of feeding the welding wire in the welding wire longitudinal direction from the tip portion of the contact tip to a tip portion of the suction nozzle, wherein the welding torch satisfies the relationship of the formula (1) 7≤ Ltk≤ 17, 0≤ Lts≤ 18 (1), whereby hydrogen discharged from the welding wire that has exited the contact tip is sucked by the suction nozzle and the suction nozzle is not melted by arc heat.
- Claim: 2. The welding torch according to claim 1 , wherein where Dsi [mm] is an inner diameter of the shielding gas supply nozzle, Dki [mm] is an inner diameter of the suction nozzle, and Dko [mm] is an outer diameter of the suction nozzle, the tip portions of the shielding gas supply nozzle and the suction nozzle satisfy the relationship of the formula (2) Dsi−Dko≥ 2, Dko−Dki≥ 1.2, 8≤ Dsi≤ 40, 1.5≤ Dki≤ 12 (2).
- Claim: 3. The welding torch according to claim 1 , wherein the suction nozzle is supported by a tip body, and wherein an electric resistance between the tip body and the tip portion of the suction nozzle is 50Ω or more.
- Claim: 4. The welding torch according to claim 3 , wherein the suction nozzle has a heat-resistant insulating member having a melting point of 1700° C. or higher at the tip portion of the suction nozzle.
- Claim: 5. The welding torch according to claim 3 , wherein the suction nozzle has a heat-resistant insulating member having a melting point of 400° C. or higher at a joining portion with the tip body supporting the contact tip.
- Claim: 6. The welding torch according to claim 3 , wherein an entirety of the suction nozzle is formed of a heat-resistant insulating material having a melting point of 1700° C. or higher.
- Claim: 7. The welding torch according to claim 1 , wherein a nozzle inner peripheral surface of the suction nozzle has a surface roughness Ra of 0.05 μm or more and 50 μM or less.
- Claim: 8. The welding torch according to claim 1 , wherein where Ss [mm 2 ] is a cross-sectional area of a shielding gas outlet at the tip of the shielding gas supply nozzle, Qs [L/min] is a shielding gas flow rate, and Vs [m/s] is a flow velocity at the shielding gas outlet, the welding torch satisfies the relationship of the formula (4) Vs≤ 7 (4).
- Claim: 9. The welding torch according to claim 2 , wherein the suction nozzle is supported by a tip body, and wherein an electric resistance between the tip body and the tip portion of the suction nozzle is 50Ω or more.
- Claim: 10. The welding torch according to claim 9 , wherein the suction nozzle has a heat-resistant insulating member having a melting point of 1700° C. or higher at the tip portion of the suction nozzle.
- Claim: 11. The welding torch according to claim 9 , wherein the suction nozzle has a heat-resistant insulating member having a melting point of 400° C. or higher at a joining portion with the tip body supporting the contact tip.
- Claim: 12. The welding torch according to claim 9 , wherein an entirety of the suction nozzle is formed of a heat-resistant insulating material having a melting point of 1700° C. or higher.
- Claim: 13. The welding torch according to claim 2 , wherein a nozzle inner peripheral surface of the suction nozzle has a surface roughness Ra of 0.05 μm or more and 50 μm or less.
- Patent References Cited: 6380515 April 2002 Knoll ; 6392184 May 2002 Yokota et al. ; 2009/0230120 September 2009 Yang ; 2010/0276396 November 2010 Cooper ; 2012/0248069 October 2012 Fisher ; 2012/0285932 November 2012 Yuan et al. ; 2013/0313241 November 2013 Zander ; 82 11 393 November 1982 ; 57-11681 January 1982 ; 62-13273 January 1987 ; H09314339 December 1997 ; 2000-312972 November 2000 ; 2002-506736 March 2002 ; 2004-160506 June 2004 ; 2015-37805 February 2015 ; 10-2009-0040251 April 2009 ; 20-2012-0008018 November 2012 ; WO 2007/106925 September 2007
- Other References: Written by Bender Shipbuilding & repair, Jeffboat , General Dynamics, Bath Iron Works, Northrop Grumman Ship system, Alabama Specialty Product, Edison Welding Institute, Title: Final Report “No stick nozzles”, Date Nov. 3, 2003 ,National Shipbuilding Research Program , p. 22 line 7-10 (Year: 2003). cited by examiner ; International Preliminary Report on Patentability and Written Opinion dated Sep. 13, 2018 in PCT/JP2017/007420 (with English translation). cited by applicant ; International Search Report dated Apr. 4, 2017, in PCT/JP2017/007420 filed Feb. 27, 2017. cited by applicant ; Extended European Search Report dated Nov. 11, 2019 in European Patent Application No. 17759895.0, 7 pages. cited by applicant
- Assistant Examiner: Thong, Yeong Juen
- Primary Examiner: Hoang, Tu B
- Attorney, Agent or Firm: Oblon, McClelland, Maier & Neustadt, L.L.P.
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