| 发明名称 |
METHOD FOR PRODUCING WELDED STEEL PIPE AND WELDED STEEL PIPE |
| 摘要 |
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:;D=p/λ (1),;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):;λ=3.44×(r×t)1/2 (2),;where r is an inner radius of the welded steel pipe and t is a wall thickness of the welded steel pipe. |
| 申请公布号 |
US2014202576(A1) |
申请公布日期 |
2014.07.24 |
| 申请号 |
US201214241478 |
申请日期 |
2012.08.30 |
| 申请人 |
Shitamoto Hidenori |
发明人 |
Shitamoto Hidenori |
| 分类号 |
B21D31/04;F16L9/02;B21C37/08 |
主分类号 |
B21D31/04 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A method for producing a welded steel pipe, comprising the steps of:
preparing a welded pipe; and expanding the welded pipe over an entire length thereof by using a pipe expanding head to form a welded steel pipe such that an undulation wavelength ratio D defined by Formula (1) is not more than 0.8, or not less than 1.8:
D=p/λ (1) where p is an undulation wavelength in an axial direction of the welded steel pipe, and λ is a Timoshenko's buckling wavelength as defined by the following Formula (2):
λ=3.44×(r×t)1/2 (2) where r is an inner radius of the welded steel pipe, and t is a wall thickness of the welded steel pipe. |
| 地址 |
Chiyoda-ku JP |
