Patents by Inventor Chang-Shung Chai

Chang-Shung Chai 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: 5225661
    Abstract: A consumable welding element for arc welding comprising a steel sheath surrounding a compacted core containing metal alloying powders and an essentially 100% basic compound in an amount less than about 1.60% of the total weight of said element. The basic compound is calcium fluoride powder which is preferably in the range of about 0.1% to about 0.9% calcium fluoride powder by total weight of the element. As another feature the core of the element contains a specific agent for decreasing the amount of diffusible hydrogen in the weld metal. This new element may be a filler metal for TIG welding; however, it is preferably a consumable electrode for MIG welding.
    Type: Grant
    Filed: December 12, 1991
    Date of Patent: July 6, 1993
    Assignee: The Lincoln Electric Company
    Inventors: Chang-Shung Chai, David A. Fink, John Gonzalez
  • Patent number: 5132514
    Abstract: A consumable welding element for arc welding comprising a steel sheath surrounding a compacted core containing metal alloying powders and an essentially 100% basic compound in an amount less than about 1.60% of the total weight of said element. The basic compound is calcium fluoride powder which is preferably in the range of about 0.1% to about 0.9% calcium fluoride powder by total weight of the element. As another feature the core of the element contains a specific agent for decreasing the amount of diffusible hydrogen in the weld metal. This new element may be a filler metal for TIG welding; however, it is preferably a consumable electrode for MIG welding.
    Type: Grant
    Filed: May 24, 1991
    Date of Patent: July 21, 1992
    Assignee: The Lincoln Electric Company
    Inventors: Chang-Shung Chai, David A. Fink, John Gonzalez
  • Patent number: 5118919
    Abstract: In a consumable welding element for depositing a weld metal bead onto a steel workpiece with the diffusible hydrogen in the weld metal being less than 2.0 ppm, the oxygen of the weld metal being less than 0.040% by weight and the yield strength of the weld metal being greater than about 85,000 psi, there is provided an improvement wherein the weld metal is a steel alloy including, as a percentage by weight of the weld metal, 0.03-0.09% carbon, 2.5-4.0% manganese, 0.01-0.05% titanium, silicon less than about 1.0%, nickel less than about 2.0%, and oxygen less than about 0.035%.
    Type: Grant
    Filed: March 29, 1990
    Date of Patent: June 2, 1992
    Assignee: The Lincoln Electric Company
    Inventors: Chang-Shung Chai, David A. Fink, John Gonzalez
  • Patent number: 5091628
    Abstract: A consumable welding element for arc welding comprising a steel sheath surrounding a compacted core containing metal alloying powders and an essentially 100% basic compound in an amount less than about 1.60% of the total weight of said element. The basic compound is calcium fluoride powder which is preferably in the range of about 0.1% to about 0.9% calcium fluoride powder by total weight of the element. As another feature the core of the element contains a specific agent for decreasing the amount of diffusible hydrogen in the weld metal. This new element may be a filler metal for TIG welding; however, it is preferably a consumable electrode for MIG welding.
    Type: Grant
    Filed: May 20, 1991
    Date of Patent: February 25, 1992
    Assignee: The Lincoln Electric Company
    Inventors: Chang-Shung Chai, David A. Fink, John Gonzalez
  • Patent number: 5055655
    Abstract: A consumable welding element for arc welding comprising a steel sheath surrounding a compacted core containing metal alloying powders and an essentially 100% basic compound in an amount less than about 1.60% of the total weight of said element. The basic compound is calcium fluoride powder which is preferably in the range of about 0.1% to about 0.9% calcium fluoride powder by total weight of the element. As another feature the core of the element contains a specific agent for decreasing the amount of diffusible hydrogen in the weld metal. This new element may be a filler metal for TIG welding; however, it is preferably a consumable electrode for MIG welding.
    Type: Grant
    Filed: March 19, 1990
    Date of Patent: October 8, 1991
    Assignee: The Lincoln Electric Company
    Inventors: Chang-Shung Chai, David A. Fink, John Gonzalez
  • Patent number: 5003155
    Abstract: A consumable welding element for arc welding comprising a steel sheath surrounding a compacted core containing metal alloying powders and an essentially 100% basic compound in an amount less than about 1.60% of the total weight of said element. The basic compound is calcium fluoride powder which is preferably in the range of about 0.1% to about 0.9% calcium fluoride powder by total weight of the element. As another feature the core of the element contains a specific agent for decreasing the amount of diffusible hydrogen in the weld metal. This new element may be a filler metal for TIG welding; however, it is preferably a consumable electrode for MIG welding.
    Type: Grant
    Filed: September 11, 1989
    Date of Patent: March 26, 1991
    Assignee: The Lincoln Electric Company
    Inventors: Chang-Shung Chai, David A. Fink, John Gonzalez
  • Patent number: 4717536
    Abstract: Weld bead analysis and electrode capable of producing same, which in multiple pass welding of thick steel plates, results in fine grain structure and high impact strength. The analysis includes as necessary ingredients, titanium, nitrogen and chromiumwith a maximum limitation on auminum, if present. The electrode contains titanium and chromium. The welding is in air and the titanium picks up nitrogen from the air and carries it into the weld bead as micro particulates of titanium nitride, which forms nucleation points for commencing fine grain growth.
    Type: Grant
    Filed: January 24, 1986
    Date of Patent: January 5, 1988
    Assignee: The Lincoln Electric Company
    Inventors: Chang-Shung Chai, Jon McCollister