Title:
A tack welding method in the manufacture process of the diameter welding steel pipe of a large
Document Type and Number:
Japanese Patent JP6112215
Kind Code:
B2
Abstract:
Provided is a tack welding method that, in welding of a large-diameter welded steel pipe or tube, enables an increase in welding speed while preventing humped beads, burn through, and incomplete fusion. In the tack welding method, tack welding is performed continuously on edges (1a) of an open pipe or tube (1) in a production process for a large-diameter welded steel pipe or tube. The tack welding is performed by gas metal arc welding in which a welding current of 1000 A or greater is supplied to a solid welding wire (3) of 4.8 mm or greater in diameter that is attached to contact tip (2), while maintaining a distance of 25 mm or greater between an outer surface of the edges (1a) and a lower end of the contact tip (2).
Inventors:
Naoya Hayakawa
Semura Tamura
Morimoto Yudai
Semura Tamura
Morimoto Yudai
Application Number:
JP2015540933A
Publication Date:
April 12, 2017
Filing Date:
April 15, 2015
Export Citation:
Assignee:
jfe Steel Corporation
International Classes:
B23K9/173; B21C37/08; B23K9/025; B23K9/235; B23K33/00; B23K35/02
Domestic Patent References:
| JP2007283363A | ||||
| JP2013081985A | ||||
| JP2013240806A | ||||
| JP2009241128A | ||||
| JP2005246419A | ||||
| JP60255298A |
Attorney, Agent or Firm:
Kenji Sugimura
Keisuke Kawahara
Keisuke Kawahara