To establish (i) a method of machining a steel plate and a method of welding the machined steel plate by which a large-sized welded steel pipe unit is efficiently manufactured, in manufacturing a large-sized welded steel pipe unit by machining and welding a steel plate of a super thickness (e.g., thickness in excess of 50 mm) and to provide (ii) the large-sized welded steel pipe which has fatigue resistance characteristic which withstands vibration of gigacycle region while no tensile stress remains or while compressive stress remains and which has a weld zone with sufficient fracture toughness.
The large-sized welded steel pipe having excellent fatigue resistance characteristics is characterized in that three or more circular arcuate long steel materials, which are long in the rolling direction of a steel plate and having a circular arcuate shape in the width direction vertical to the rolling direction, are butted on the end faces in the rolling direction and that the butted faces are welded by high energy density beam welding.
COPYRIGHT: (C)2011,JPO&INPIT
Chu Ishikawa
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Takashi Ishida
Tetsuji Koga
Hiroshi Kamematsu
Nakamura Asayuki
Nagasaka Tomoyasu