Importance

Loading Importance Indicators...

Abstract

Provided is a method for producing a welded steel pipe having excellent buckling resistance. The method for producing a welded steel pipe according to the present embodiment includes steps of: preparing a welded pipe, and expanding the welded pipe over the entire length thereof by using a pipe expanding head such that an undulation wavelength ratio D defined by Formula (1) is not more than 0.8, or not less than 1.8:

description='In-line Formulae' end='lead'D=p/λ  (1),description='In-line Formulae' end='tail'

where p is an undulation wavelength in the axial direction of the welded steel pipe, and λ is a Timoshenko's buckling wavelength as defined by Formula (2):

description='In-line Formulae' end='lead'λ=3.44×(r×t)^1/2   (2),description='In-line Formulae' end='tail'

where r is an inner radius of the welded steel pipe and t is a wall thickness of the welded steel pipe.

Loading the Abstract Image...

First Claim