SUBMERGED ARC WELDING PART EXCELLENT IN LOW TEMPERATURE TOUGHNESS

Japanese Patent JP2015150597

A

PROBLEM TO BE SOLVED: To provide a submerged arc welding part capable of improving low temperature toughness of a seam welding part of a UO steel pipe for a line pipe used in an extremely cold district.SOLUTION: A submerged arc welding part excellent in low temperature toughness is characterized in that, in a welding part of a UO steel pipe manufactured by forming a steel plate of X60 to X80 class of which the plate thickness is 20 mm or more into a cylindrical shape and welding butting faces subjected to beveling beforehand according to bilayer welding of one layer from the inner surface and one layer from the outer surface by using multi-electrode submerged arc welding, (1) an angle between the inclination of a tangent of a melt line on the position of 7 mm from the plate surface of welding metal of precedent welding part and/or succeeding welding part and a center line of welding bead is 15° or more and (2) toughness of welding metal center on the position of 7 mm from the plate surface is 2.0 times or more of toughness of a welding heat affected zone of 0.5 mm from the melt line.

MORIMOTO YUTAKA
HARA TAKUYA
SHINOHARA YASUHIRO
FUJIYAMA NAOTO
HAMADA MASAHIKO

JP2014027469A

August 24, 2015

February 17, 2014

Click for automatic bibliography generation  

NIPPON STEEL & SUMITOMO METAL CORP

B23K9/025; B23K9/18; B23K9/23; B23K35/30

JP2013078775A	2013-05-02
JP2013049895A	2013-03-14
JP2009202167A	2009-09-10

Atsushi Aoki
Takashi Ishida
Tetsuji Koga
Hiroshi Kamematsu
Nakamura Asayuki
Nagasaka Tomoyasu

Previous Patent: JOINING METHOD

Next Patent: CASTING MOLD, CASTING MANUFACTURING METHOD, AND PROPELLER CAP MANUFACTURING METHOD