Patents Represented by Law Firm Antonelli, Terry, Stout et al.
  • Method and structure for preventive maintaining an elongated metal hollow member
    Patent number: 5227124
    Abstract: An ICM housing welded to a wall of a reactor pressure vessel in operation is provided with a molten metal layer containing 4 wt. % or more .delta. ferrite at a portion of an inner peripheral surface thereof which corresponds to a weld. A sleeve made of stainless steel is located at the competent portion of the inner peripheral surface of the ICM housing stainless steel so as to be molten by means of a TIG welding machine to form the molten metal layer. The molten metal layer prevents stress corrosion cracking of the ICM housing.
    Type: Grant
    Filed: August 2, 1990
    Date of Patent: July 13, 1993
    Assignees: Hitachi, Ltd., Babcock-Hitachi Kabushiki Kaisha, Hitachi Kyowa Kogyo Co., Ltd.
    Inventors: Hideyo Saito, Koichi Kurosawa, Takayuki Numata, Shigeo Hattori, Takenori Shindo