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A kind of manufacturing method of spiral seam bimetal composite welded pipe

The technology of a composite welded pipe and a manufacturing method, which is applied in the field of composite welded pipe manufacturing, can solve problems such as the inability of the composite welded pipe to meet the needs of users, and achieve the effect of avoiding the decline of corrosion resistance and broadening the application field.

Active Publication Date: 2016-02-17
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of bimetallic composite pipes whose price is much lower than that of stainless steel is the development direction of corrosion-resistant oil and gas transportation pipes. Due to the limitation of the width of the composite sheet, the composite pipe formed by straight seam cannot meet the needs of users

Method used

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  • A kind of manufacturing method of spiral seam bimetal composite welded pipe
  • A kind of manufacturing method of spiral seam bimetal composite welded pipe
  • A kind of manufacturing method of spiral seam bimetal composite welded pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Using 2205 / X65 bimetal composite plate as raw material (2205 stainless steel plate thickness 2mm, X65 pipeline steel plate thickness 10mm), X-shaped composite groove is adopted, and the angle of single-side groove on the base layer is 35° and leaves 1mm blunt edge, single-sided bevel angle of cladding layer is 45°, after the composite plate is spiral formed, TIG welding is used to weld the transition layer first, then MAG welding or SAW welding is used to weld the base layer, and finally TIG welding is used for off-line welding layered. The specific welding process parameters are as follows:

[0027]

[0028] Test results of mechanical properties of welded pipe: tensile strength 675MPa, 0°C impact toughness weld seam 105J, heat-affected zone 210J, weld seam forward and reverse bending 180 degrees without cracks. The corrosion test is carried out according to the standard GB / T4334-2008, boiled in sulfuric acid-copper sulfate solution for 72 hours, no crack...

Embodiment 2

[0029] Example 2: Using pure titanium TA1 / X65 bimetallic composite plate as raw material (pure titanium TA1 thickness 2mm, X65 thickness 10mm), using X-shaped composite groove, and the single-side groove angle of the base layer is 32° and 1mm blunt is left The single-side groove angle of the cladding layer is 40°. After the composite plate is spiral formed, the transition layer is welded by TIG welding, and then the base layer is welded by MAG welding or SAW welding. Finally, the cladding layer is welded off-line by TIG welding. .

[0030]

[0031] Test results of mechanical properties of the welded pipe: the tensile strength is 705MPa, the impact toughness of the weld at 0°C is 85J, the heat affected zone is 180J, and the weld is bent 180 degrees forward and backward without cracks. The corrosion test is carried out in accordance with ASTMB898-05, boiled in sulfuric acid-copper sulfate solution for 72 hours, no cracks when bent.

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Abstract

Provided is a spiral seam thermometal composite welded pipe manufacturing method. The method includes that step 1, straightening and surface processing are conducted on composite plates manufactured through a process of explosion and hot rolling, and X-shaped welding grooves are machined in two sides of each plate; step 2, the machined composite plates are continuously fed into a spiral pipe forming unit to be bent gradually into a pipe shape, and spiral seams are formed; step 3, transition layer continuous prewelding is conducted on the formed spiral seams by adopting a metal active-gas (MAG) welding process; step 4, continuous welding is conducted on base layers outside pipes by adopting the MAG welding process or a submerged arc welding (SAW) process; step 5, continuous welding is conducted on composite layers in the pipes by adopting a tungsten inert gas (TIG) welding process; step 6, products are formed through sizing, detecting and post-processing. By means of a spiral forming method, thermometal composite pipes with different diameters are manufactured through composite rolled plates with the same width, a two-step welding process is adopted, and the method is suitable for industrial batch production.

Description

technical field [0001] The invention belongs to the technical field of composite welded pipe manufacture, and in particular relates to a method for manufacturing a spiral seam bimetal composite welded pipe. Background technique [0002] H in oil and gas pipelines 2 S, CO 2 It will cause serious uniform corrosion, pitting corrosion, sulfide stress corrosion cracking and hydrogen-induced cracking of the pipeline, which will lead to the failure and accident of the pipeline. The use of corrosion-resistant composite pipe is one of the most economical ways. The use of bimetallic composite pipes whose price is much lower than that of stainless steel is the development direction of corrosion-resistant oil and gas transportation pipes. Due to the limitation of the width of the composite plates, the composite pipes formed by straight seams cannot meet the needs of users. Contents of the invention [0003] The invention provides a method for manufacturing a spiral seam bimetallic c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00
Inventor 毕宗岳刘海璋张万鹏杨军张锦刚牛辉张君黄晓辉
Owner BC P INC CHINA NAT PETROLEUM CORP