Pipe body, pipe and method of making pipe

Patent metadata

Field	Value
Publication number	US-10907752-B2
Application number	US-201716071768-A
Country	US
Kind code	B2
Filing date	Jan 20, 2017
Priority date	Jan 20, 2016
Publication date	Feb 2, 2021
Grant date	Feb 2, 2021

Abstract

A pipe body, wherein the pipe body (10) has a welded portion (11) at both ends of the pipe body, aligned in a widthwise direction of the pipe body (10). The thickness of the welded portion (11) decreases gradually from the inside to the outside of the pipe, and an outer end of the welded portion (11) is located at a center portion of the pipe body (10) in a thickness direction. The configuration of the welding structure enhances the strength of the welded portion of the pipe, so that the pipe will not crack easily when it is reworked by flaring or bending, thus having high reworkability. In addition, a pipe (100) made of the pipe body (10) and a method of making the pipe (100) are disclosed.

First claim

What is claimed is:

1. A pipe, wherein the pipe is formed by welding and bending a pipe body, a weld seam of the pipe is in an X-shape, wherein two ends of the pipe body are both provided with a welded portion, a thickness of the welded portion decreases gradually from an inside to an outside of the pipe body in a direction along a width of the pipe body, and an outer end of the welded portion is located at a center portion in a direction along a thickness of the pipe body, wherein a peripheral face of the welded portion is formed by two or more straight-line segments connected in sequence, wherein a predetermined distance is provided between faces of outer ends of two welded portions when the pipe body is bent, and the predetermined distance is 1 to 3 times the thickness of the pipe body.

2. The pipe according to claim 1 , wherein the peripheral face of the welded portion comprises three straight-line segments in sequence: a first straight-line segment, a second straight-line segment and a third straight-line segment, and the second straight-line segment forms a face of an outer end of the welded portion.

3. The pipe according to claim 2 , wherein the second straight-line segment is parallel to a direction along the thickness of the pipe body, and a length of the second straight-line segment is 0.1 to 0.5 times the thickness of the pipe body; a length of the first straight-line segment and a length of the third straight-line segment are both 1 to 3 times the thickness of the pipe body.

4. The pipe according to claim 3 , wherein an included angle between the first straight-line segment and the direction along the thickness of the pipe body and an included angle between the second straight-line segment and the direction along the thickness of the pipe body are both in a range of 20° to 80°.

5. The pipe according to claim 1 , wherein the peripheral face of the welded portion is symmetrical with respect to a center in the direction along the thickness of the pipe body.

6. The pipe according to claim 1 , wherein the pipe is specifically a composite pipe, the pipe body comprises a first layer body and a second layer body fixed at an inner side and/or an outer side of the first layer body, and materials of the first layer body and the second layer body are different.

7. The pipe according to claim 6 , wherein the first layer body is a steel material, and the second layer body is a copper material.

8. A manufacturing method of a pipe, comprising following steps: a. manufacturing a pipe body; b. manufacturing a welded portion at each of two ends of the pipe body, wherein a thickness of the welded portion decreases gradually from an inside to an outside of the pipe body in a direction along a width of the pipe body, and an outer end of the welded portion is located at a center portion in a direction along a thickness of the pipe body, wherein a peripheral face of the welded portion is formed by two or more straight-line segments connected in sequence creating a weld seam of the pipe in an X-shape; c. extruding the pipe body in step b into a circular pipe shape, and maintaining a predetermined distance between faces of ends of two welded portions of the pipe body, and the predetermined distance is 1 to 3 times the thickness of the pipe body; d. welding the welded portion at each of two ends of the pipe body to form the pipe.

9. The manufacturing method of the pipe according to claim 8 , further comprising following steps after step d:
e. accurately correcting the pipe formed in step d;
f. performing an eddy current testing on the pipe after accurate correction in step e, and performing a secondary annealing treatment for a predetermined time on the pipe.

10. The manufacturing method of a pipe according to claim 9 , wherein in step f, the pipe after accurate correction is fed into a vacuum furnace with a preset temperature for the secondary annealing treatment.

11. The manufacturing method of a pipe according to claim 8 , wherein in step a, a first layer body and a second layer body of different materials are prepared, the second layer body is fixed at an inner side and/or an outer side of the first layer body, and the first layer body and the second layer body are rolled into an integral body by a method of rolling, to form the pipe body.

Assignees

• Zhejiang Sanhua Intelligent Controls Co Ltd

Inventors

• Wang Yiqi
• Zhuang Xinyu
• Zhang Shengli
• Pan Yong
• Zhang Zhijun
• Chen Feng

Classifications

• F16L9/17 Primary

  obtained by bending a sheet longitudinally and connecting the edges · CPC title

• F16L9/02

  of metal (F16L9/16 - F16L9/22 take precedence) · CPC title

• C21D9/08

  for tubular bodies or pipes · CPC title

• B23K2101/34

  Coated articles {; Surface treated articles} · CPC title

• B23K2101/06

  Tubes · CPC title