Patents by Inventor Stefan Helgee

Stefan Helgee 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).

  • Method for arc welding of ductile cast iron
    Patent number: 7518082
    Abstract: A method for joining components made from ductile cast iron and made from ductile cast iron and steel, by arc welding with fusible electrodes under a gas blanket. The gas blanket comprises, in addition to argon, 1 to 25 vol. % carbon dioxide and/or 0.5 to 10 vol. % oxygen. The gas blanket can also comprise nitrogen monoxide. Said method permits high welding speeds and hence a high productivity. The joint quality can be further advantageously improved by means of a pre-heating of the components and a slow cooling or a post-treatment.
    Type: Grant
    Filed: November 29, 2003
    Date of Patent: April 14, 2009
    Assignee: Linde Aktiengesellschaft
    Inventors: Stefan Helgee, Jorma Tani
  • Method for arc welding of ductile cast iron
    Publication number: 20060151440
    Abstract: A method for joining components made from ductile cast iron and made from ductile cast iron and steel, by arc welding with fusible electrodes under a gas blanket. The gas blanket comprises, in addition to argon, 1 to 25 vol. % carbon dioxide and/or 0.5 to 10 vol. % oxygen. The gas blanket can also comprise nitrogen monoxide. Said method permits high welding speeds and hence a high productivity. The joint quality can be further advantageously improved by means of a pre-heating of the components and a slow cooling or a post-treatment.
    Type: Application
    Filed: November 29, 2003
    Publication date: July 13, 2006
    Applicant: Linde Aktiengesellschaft
    Inventors: Stefan Helgee, Jorma Tani