A bimetal welding construction process method for surfacing prefabricated inner patch bimetal pipes

A construction technique and bimetal technology, applied in metal processing equipment, manufacturing tools, welding equipment, etc., can solve problems such as inability to penetrate bimetal welds, reduce safety and environmental risks, improve pipeline life, and reduce waste of resources Effect

Active Publication Date: 2022-06-24
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the shortcoming that the bimetal weld seam cannot be penetrated in the prior art, and propose a bimetal welding construction method for prefabricated internal joint bimetal pipelines

Method used

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  • A bimetal welding construction process method for surfacing prefabricated inner patch bimetal pipes
  • A bimetal welding construction process method for surfacing prefabricated inner patch bimetal pipes
  • A bimetal welding construction process method for surfacing prefabricated inner patch bimetal pipes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The specification of the bimetallic composite pipe is Φ914.4mm×68mm, the base material is ASTM A671CC65 carbon steel, the corrosion-resistant inner lining is UNS N06625 nickel-based alloy, and the thickness of the inner lining is 3 mm. The main operation steps are as follows:

[0043] (1) Double U-shaped groove processing:

[0044] Double U-shaped groove processing such as ( figure 1 ), the blunt edge of the lower U-shaped groove is composed of surfacing corrosion-resistant alloy, and the groove surface is composed of surfacing welding dilution alloy; the upper U-shaped groove surface is composed of low-carbon steel base material, and its blunt edge is both the bevel face of the down bevel;

[0045] (2) Nozzle pair and back protection:

[0046] Before the nozzle assembly is cleaned, the impurity oil stains on the nozzle and the nearby area shall be removed, so that the bevel has a metallic luster, and the processing quality of the nozzle shall be checked to ensure th...

Embodiment 2

[0056] The specification of the bimetallic composite sea pipe is Φ219.1×14.3+3mm, the base material is PSL2X65SMLS according to API standard, and the lining is 316L stainless steel. The main operation steps of the process method are as follows:

[0057] (1) Double U-shaped groove processing:

[0058] Double U-shaped groove processing such as ( figure 1 ), the blunt edge of the lower U-shaped groove is composed of surfacing corrosion-resistant alloy, and the groove surface is composed of surfacing welding dilution alloy; the upper U-shaped groove surface is composed of low-carbon steel base material, and its blunt edge is both the bevel face of the down bevel;

[0059] (2) Nozzle pair and back protection:

[0060] Before the nozzle assembly is cleaned, the impurity oil stains on the nozzle and the surrounding area shall be removed, so that the bevel is exposed to metallic luster, and the processing quality of the nozzle shall be checked to ensure the integrity of the nozzle ...

Embodiment 3

[0070] The specification of the bimetallic composite sea pipe is Φ219.1×14.3+3mm, the base material is PSL2X65SMLS according to API standard, and the lining is 316L stainless steel. The main operation steps of the process method are as follows:

[0071] (1) Double U-shaped groove processing:

[0072] Double U-shaped groove processing such as ( figure 1 ), the blunt edge of the lower U-shaped groove is composed of surfacing corrosion-resistant alloy, and the groove surface is composed of surfacing welding dilution alloy; the upper U-shaped groove surface is composed of low-carbon steel base material, and its blunt edge is both the bevel face of the down bevel;

[0073] (2) Nozzle pair and back protection:

[0074] Before the nozzle assembly is cleaned, the impurity oil stains on the nozzle and the surrounding area shall be removed, so that the bevel is exposed to metallic luster, and the processing quality of the nozzle shall be checked to ensure the integrity of the nozzle ...

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Abstract

The invention belongs to the welding field of surfacing prefabricated internal joint bimetallic pipes, in particular to a bimetallic welding construction process method for surfacing prefabricated internal joint bimetallic pipes, which adopts double U-shaped butt joint grooves and melts the prefabricated The blunt edge of the inner joint layer is fused to form the root welding layer, which realizes the reliable connection of the corrosion-resistant alloy prefabricated inner joint layer, and forms the transition welding layer through the melting and leveling of the metal in the surfacing welding fusion zone, and realizes the transition to the low carbon steel welding layer. Transition, the weld seam welding is completed through the filling cover of the low carbon steel welding material in the weld seam; the bimetallic weld seam completed by this method solves the technical problem that the low carbon steel welding material cannot weld the stainless steel base material, and avoids the prefabricated interior The risk of electrochemical corrosion caused by the melting of the corrosion-resistant alloy layer into the low-carbon steel component ensures the physical and chemical properties of the weld; this process is important for the popularization and application of corrosion-resistant alloy prefabricated internal joints and internal anti-corrosion pipelines, and to improve the life of the pipeline effect.

Description

technical field [0001] The invention relates to the field of welding technology for surfacing prefabricated inner patch bimetal pipes, in particular to a bimetal welding construction technique for surfacing prefabricated inner patch bimetal pipes. Background technique [0002] In the pipeline transportation of corrosive medium, it is necessary to carry out anti-corrosion treatment on the inner wall of the pipeline to improve the service life of the pipeline, but the heat input of the butt welding of the pipeline will damage the anti-corrosion coating on the inner wall of the welding joint. and corrosion-resistant alloy welding seam to achieve the continuity of the internal anti-corrosion layer; at present, the welding method of stainless steel clad pipe lined with stainless steel clad pipe is usually used for welding of corrosion-resistant alloy surfacing prefabricated inner-filling pipe in China: that is, welding by stainless steel welding material, in practice During the w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/167B23K9/04B23K9/18
CPCB23K9/167B23K9/04B23K9/18
Inventor 李风王亭沂陈健飞冷传基张瑾穆学杰田黎明
Owner CHINA PETROLEUM & CHEM CORP
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