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Welding forming method of highly corrosion-resistant stainless steel composite tube

A welding forming, stainless steel technology, applied in the direction of welding equipment, welding/welding/cutting articles, tubular articles, etc., can solve the problem of affecting the structural bearing capacity and corrosion resistance, low bonding degree and bonding strength, prone to delamination cracks, etc. problems, to achieve the effect of improving welding efficiency, long service life and reducing production costs

Inactive Publication Date: 2016-09-21
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, most stainless steel composite pipes are lined with seamless stainless steel composite pipes, which are prepared by metal pipe deflagration lining technology, that is, carbon steel pipes and stainless steel pipes are used as blanks, assembled into double-layer pipes according to a certain gap, and then deflagration and lining are used. Lining technology, such as explosive welding, thermal expansion welding, thermal diffusion welding or thermal deformation method, produces stainless steel composite pipes. The interfacial bonding obtained by this method is only mechanical bonding or semi-metallurgical bonding. Weak interface state, low bonding degree and bonding strength, prone to delamination, which will easily cause delamination cracks in the subsequent straightening, assembly, cutting and processing, welding and service processes, which greatly affects the Structural bearing capacity and corrosion resistance

Method used

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  • Welding forming method of highly corrosion-resistant stainless steel composite tube
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  • Welding forming method of highly corrosion-resistant stainless steel composite tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Use a cutting machine to cut the 304 stainless steel composite plate into a plate with a length of 1000mm and a width of 1500mm, wherein the cladding is stainless steel with a thickness of 1mm, and the base is carbon steel with a thickness of 5mm, (the thickness of the cladding and the base ratio is 1:5);

[0027] (2) Use a grinding machine to symmetrically process the long side of the stainless steel composite plate into an "X" groove with an angle of about 50°;

[0028] (3) Set the pipe bending parameters, use a two-roller periodic cold rolling machine to repeatedly roll the stainless steel clad plate, and bend the stainless steel clad plate into a stainless steel clad pipe with an outer diameter of 480mm;

[0029] (4) Clean up before welding, use grinding wheel and acetone to thoroughly clean the rust, grease, dust, water, etc. on the groove and both sides in order to prevent impurities from adversely affecting the quality of the weld;

[0030] (5) A302 electrod...

Embodiment 2

[0036] (1) Use a cutting machine to cut the 304 stainless steel composite plate into a plate with a length of 1000mm and a width of 1500mm, wherein the cladding is stainless steel with a thickness of 1mm, and the base is carbon steel with a thickness of 5mm, (the thickness of the cladding and the base ratio is 1:5);

[0037] (2) Use a grinding machine to symmetrically process the long side of the stainless steel composite plate into an "X" groove with an angle of about 50°;

[0038] (3) Set the pipe bending parameters, use a two-roller periodic cold rolling machine to repeatedly roll the stainless steel clad plate, and bend the stainless steel clad plate into a stainless steel clad pipe with an outer diameter of 480mm;

[0039] (4) Clean up before welding, use grinding wheel and acetone to thoroughly clean the rust, grease, dust, water, etc. on the groove and both sides, so as to prevent impurities from adversely affecting the quality of the weld;

[0040](5) A302 electrode a...

Embodiment 3

[0045] Other steps are with embodiment 1, and difference is that cladding is stainless steel, and thickness is 1mm, and base is carbon steel, and thickness is 4mm, and the thickness ratio of cladding and base is 1:4;

[0046] The resulting stainless steel composite pipe is the same as in Example 1.

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Abstract

The invention provides a welding forming method of a highly corrosion-resistant stainless steel composite tube. The method comprises the following steps: (1) cutting a stainless steel composite plate into panels in required sizes; (2) symmetrically processing long sides of the panels of the stainless steel composite tubes into X-shaped grooves; (3) bending the stainless steel composite tubes into stainless steel composite tubes, wherein the outer diameter is a required diameter; (4) performing preweld cleaning; (5) performing electric-arc welding on a cladding metal by using a welding rod, wherein the welding rod is a stainless steel welding rod; (6) performing electric-arc welding on a base metal by using a welding rod, wherein the welding rod is a stainless steel welding rod or a carbon steel welding rod; and (7) grinding and straightening the welded stainless steel composite tubes. According to the method provided by the invention, various welding steps such as sealing, transition welding and overlay welding are reduced, the welding efficiency is extremely improved and the production cost is extremely lowered. Furthermore, the method is relatively simple, and a relatively strong metallurgical bonding interface prevents occurrence of delamination cracks.

Description

technical field [0001] The invention relates to a welding and pipe-making technology of a stainless steel composite plate, which belongs to the field of welding technology. Background technique [0002] Nowadays, with the development of high-sulfur coal, oil and gas resources, and the promotion of oil and gas high-pressure transmission technology, the corrosion of carbon steel pipelines has attracted more and more attention, and the demand for high-strength and high-corrosion-resistant pipes is more urgent. A variety of solutions have been developed to prevent the corrosion of fluids on pipelines, such as adding corrosion inhibitors to fluids, coating, plating, infiltrating, and lining corrosion-resistant layers in pipelines, and using corrosion-resistant alloys or stainless steel pipes. However, high prices and environmental pollution are the main obstacles hindering pipeline improvement and replacement. [0003] The stainless steel composite pipe gives full play to the hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B23K9/235B23K9/095B23K101/06B23K103/04
CPCB23P15/00B23K9/095B23K9/235B23K2101/06B23K2103/04B23K2103/05
Inventor 刘宝玺代响林刘明阳殷福星陈翠欣
Owner HEBEI UNIV OF TECH
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