Patents by Inventor Karim Chouf

Karim Chouf 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).

  • Hybrid laser-arc welding method with gas flow rate adjustment
    Publication number: 20050011868
    Abstract: The invention concerns a hybrid arc-laser method for welding metal parts, such as a tube or tailored blanks by producing at least a weld joint between edges to be welded and by using a laser beam and an electric arc combined with each other so as to melt and subsequently solidify the metal along said edges to be welded.
    Type: Application
    Filed: July 29, 2002
    Publication date: January 20, 2005
    Inventors: Olivier Matile, Karim Chouf, Philippe Leferbve
  • Use of helium/nitrogen gas mixtures for the laser welding of stainless steel pipes
    Patent number: 6831248
    Abstract: Process for welding together the two longitudinal edges of a sheet of austenitic, ferritic or martensitic stainless steel so as to obtain a welded pipe, employing at least one laser beam having a power ranging up to 12 kW, and in which a gas mixture is used that consists of 30% to 80% nitrogen by volume and of helium for the remainder (up to 100%). The stainless steel sheet has a thickness of 0.5 to 4 mm and the pipe obtained has a diameter of 5 mm to 50 cm. The welding is full-penetration welding.
    Type: Grant
    Filed: June 9, 2003
    Date of Patent: December 14, 2004
    Assignee: L'Air Liquide, S.A.
    Inventors: Francis Briand, Karim Chouf, Philippe Lefebvre, Eric Verna
  • Use of helium/nitrogen gas mixtures for laser welding tailored blanks
    Patent number: 6815635
    Abstract: Method of welding tailored blanks consisting of a material mostly containing steel and a proportion greater than 0.015% aluminium by weight, using at least one laser beam, in which at least one weld joint of the full-penetration type is made using a gas mixture consisting of 30% to 80% nitrogen by volume, the rest being helium (up to 100%) in order to assist the said laser beam. The method of the invention is particularly recommended for welding motor vehicle elements, especially bodywork, doors, bonnets or the like.
    Type: Grant
    Filed: June 10, 2003
    Date of Patent: November 9, 2004
    Assignee: L'Air Liquide, Societe Anonyme pour l'etude et, l'Exploitation des Procedes Georges Claude
    Inventors: Francis Briand, Karim Chouf, Philippe Lefebvre, Eric Verna
  • Use of helium/nitrogen gas mixtures in up to 8kW laser welding
    Patent number: 6770841
    Abstract: Binary gas mixture for welding using a laser beam of up to 8 kW, consisting of 60% to 80% nitrogen by volume, the remainder (up to 100%) being helium. Application of this gas mixture to the welding of steel, stainless steel or titanium.
    Type: Grant
    Filed: June 9, 2003
    Date of Patent: August 3, 2004
    Assignee: L'Air Liquide, Société Anonyme {overscore (a)} Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procédés Georges Claude
    Inventors: Francis Briand, Karim Chouf, Philippe Lefebvre, Eric Verna
  • Use of helium/nitrogen gas mixtures for the laser welding of stainless steel pipes
    Publication number: 20030230557
    Abstract: Process for welding together the two longitudinal edges of a sheet of austenitic, ferritic or martensitic stainless steel so as to obtain a welded pipe, employing at least one laser beam having a power ranging up to 12 kW, and in which a gas mixture is used that consists of 30% to 80% nitrogen by volume and of helium for the remainder (up to 100%). The stainless steel sheet has a thickness of 0.5 to 4 mm and the pipe obtained has a diameter of 5 mm to 50 cm. The welding is full-penetration welding.
    Type: Application
    Filed: June 9, 2003
    Publication date: December 18, 2003
    Inventors: Francis Briand, Karim Chouf, Philippe Lefebvre, Eric Verna
  • Use of helium/nitrogen gas mixtures in up to 12kW laser welding
    Publication number: 20030230558
    Abstract: Binary gas mixture for welding using a laser beam of up to 12 kW, consisting of 30% to 60% nitrogen by volume, the remainder (up to 100%) being helium. Application of this gas mixture to the welding of steel, stainless steel or titanium.
    Type: Application
    Filed: June 9, 2003
    Publication date: December 18, 2003
    Inventors: Francis Briand, Karim Chouf, Philippe Lefebvre, Eric Verna
  • Use of helium/nitrogen gas mixtures in up to 8kW laser welding
    Publication number: 20030230556
    Abstract: Binary gas mixture for welding using a laser beam of up to 8 kW, consisting of 60% to 80% nitrogen by volume, the remainder (up to 100%) being helium. Application of this gas mixture to the welding of steel, stainless steel or titanium.
    Type: Application
    Filed: June 9, 2003
    Publication date: December 18, 2003
    Inventors: Francis Briand, Karim Chouf, Philippe Lefebvre, Eric Verna
  • Use of helium/nitrogen gas mixtures for laser welding tailored blanks
    Publication number: 20030230559
    Abstract: Method of welding tailored blanks consisting of a material mostly containing steel and a proportion greater than 0.015% aluminium by weight, using at least one laser beam, in which at least one weld joint of the full-penetration type is made using a gas mixture consisting of 30% to 80% nitrogen by volume, the rest being helium (up to 100%) in order to assist the said laser beam. The method of the invention is particularly recommended for welding motor vehicle elements, especially bodywork, doors, bonnets or the like.
    Type: Application
    Filed: June 10, 2003
    Publication date: December 18, 2003
    Inventors: Francis Briand, Karim Chouf, Philippe Lefebvre, Eric Verna