Title:
WELDED PIPE MANUFACTURING METHOD, AND WELDED PIPE MANUFACTURING DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/196646
Kind Code:
A1
Abstract:
In this method for manufacturing a welded pipe by bending a stainless steel strip having a thickness of 0.15 mm or more and 0.45 mm or less while conveying the stainless steel strip in one direction, to form a pipe, and welding abutting portions of the formed pipe by irradiating the same with a laser beam while applying compressive stress thereto by means of a set of squeeze rollers: the laser beam irradiation position is on the upstream side, in the pipe conveying direction, of the position of an axis of rotation of the squeeze rollers; the size of the spot diameter of the laser beam at the laser beam irradiation position is at least equal to 0.60 mm and at most equal to 1.2 mm; and an inert gas is blown from a gas nozzle onto the abutting portions irradiated by the laser beam.
Inventors:
YAMANE HIRONORI (JP)
YOKAWA TAKAHIRO (JP)
SASAKI MAKOTO (JP)
YOKAWA TAKAHIRO (JP)
SASAKI MAKOTO (JP)
Application Number:
PCT/JP2020/013392
Publication Date:
October 01, 2020
Filing Date:
March 25, 2020
Export Citation:
Assignee:
HITACHI METALS LTD (JP)
International Classes:
B21C37/08; B23K26/262; B23K26/08; B23K26/21; B23K26/60
Foreign References:
| JPH0976094A | 1997-03-25 | |||
| JPH08276214A | 1996-10-22 | |||
| JPH03198991A | 1991-08-30 |
Attorney, Agent or Firm:
YAMAO, Norihito (JP)
Download PDF: