Patents by Inventor Shigemichi Yamauchi

Shigemichi Yamauchi 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).

  • High strength steel weld having improved resistance to cold cracking and a welding method
    Patent number: 6953508
    Abstract: A welding method includes performing welding to form a weld metal consisting essentially of, in mass %, C: 0.01-0.15%, Si: 0.02-0.6%, Mn: 0.6-3.0%, Al: 0.004-0.08%, Ti: 0.003-0.03%, B: at most 0.005%, Cu: 0-1.2%, Ni: 0-3%, Cr: 0-1.2%, Mo: 0-2%, V: 0-0.05%, Nb: 0-0.05%, and a remainder of Fe and unavoidable impurities. The amounts of impurities are P: at most 0.03%, S: at most 0.03%, N: at most 0.01%, Ca or Mg: at most 0.005%. The value of Pcm expressed by the following Equation (3) is in the range of 0.23-0.35%, and the time T until the weld metal is cooled to 100° C. after welding satisfies the following Equation (1): T(seconds)?exp(7.0×Pw+4.66)??Equation (1) Pw=Pcm+HD/60??Equation (2) Pcm(mass %)=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B??Equation (3) HD [ml/100 g]: amount of hydrogen in the weld metal immediately after welding.
    Type: Grant
    Filed: January 2, 2003
    Date of Patent: October 11, 2005
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Tomoaki Ikeda, Akio Yamamoto, Shigemichi Yamauchi, Nobuaki Takahashi, Masahiko Hamada
  • High strength steel weld having improved resistance to cold cracking and a welding method
    Publication number: 20040129348
    Abstract: A welding method includes performing welding to form a weld metal consisting essentially of, in mass %, 1 C: 0.01-0.15%, Si: 0.02-0.6%, Mn: 0.6-3.0%, Al: 0.004-0.08%, Ti: 0.003-0.03%, B: at most 0.005%, Cu: 0-1.2%, Ni: 0-3%, Cr: 0-1.2%, Mo: 0-2%, V: 0-0.05%, Nb: 0-0.
    Type: Application
    Filed: January 2, 2003
    Publication date: July 8, 2004
    Inventors: Tomoaki Ikeda, Akio Yamamoto, Shigemichi Yamauchi, Nobuaki Takahashi, Masahiko Hamada