Title:
GAS SHIELD ARC WELDING METHOD AND STEEL PIPE MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2021/205858
Kind Code:
A1
Abstract:
Provided is a gas shield arc welding method that reduces the number of joints, which are the sites where defects occur more readily, and that enables automatic welding with a welding robot. A gas shield arc welding method in which a steel pipe Wo is welded by multi-pass welding comprises: a step in which a steel frame erection adjusting tool (13) is attached to an erection piece (12) provided on the steel pipe Wo to immobilize an open end section (10) of the steel pipe Wo; a step in which an initial single layer or several layers are welded to the open end section (10) by semiautomatic welding or manual welding; a step in which, after welding of the initial single layer or several layers is finished, the steel frame erection adjusting tool (13) is removed; and a step in which remaining layers are welded with a welding robot (100) such that two bead joints are formed at no more than two sites.
Inventors:
YASHIMA TAKASHI
Application Number:
PCT/JP2021/011709
Publication Date:
October 14, 2021
Filing Date:
March 22, 2021
Export Citation:
Assignee:
KOBE STEEL LTD (JP)
International Classes:
B23K9/00; B23K9/095; B23K9/12; B23K9/173; B23K37/00; E04G21/18
Foreign References:
| JPH06328245A | 1994-11-29 | |||
| JP2018053626A | 2018-04-05 | |||
| JP2019155409A | 2019-09-19 | |||
| JPH09234562A | 1997-09-09 | |||
| JP2004330227A | 2004-11-25 |
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (JP)
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