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Bimetal composite pipe both-side welding process

A bimetallic composite pipe, double-sided welding technology, applied in metal processing equipment, welding equipment, manufacturing tools and other directions, can solve the problems of high cost and low welding efficiency, and achieve the reduction of welding material cost, the improvement of welding efficiency, and the improvement of welding efficiency. quality effect

Active Publication Date: 2015-07-29
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the welding of bimetallic composite pipes, the current mainstream welding process at home and abroad is single-sided welding. This method requires high-alloy welding consumables for the base layer and inner lining of the composite pipe. The process is simple but the welding efficiency is low. High cost, so room for improvement

Method used

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  • Bimetal composite pipe both-side welding process

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Comparison scheme
Effect test

Embodiment 1

[0041] The specification of the bimetal composite pipe is Φ914.4mm×68mm. The base material is ASTM A671CC65 carbon steel of ASTM standard. The corrosion-resistant inner lining is UNS N06625 nickel-based alloy, and the thickness of the inner lining is 3mm. The main operation steps are as follows:

[0042] 1. Preparation process before welding:

[0043] 1) Groove production: use the method of machining + grinding to process double-sided composite grooves. The structure of double-sided composite grooves is as follows: figure 1 shown. One side of the outer groove located on the side of the carbon steel matrix 7 is a single-V composite groove with a lower groove slope 2 of 35 degrees, an upper groove slope 1 of 10 degrees, and the other side with a slope 6 of 30 degrees. The blunt edge 8 of the single-V composite groove is 2mm, the groove gap 10 is 3mm, the connection between the lower groove and the upper groove on the outer groove side is the inflection point, and the vertical ...

Embodiment 2

[0072] The specification of the bimetallic composite pipe is Φ965.2mm×70mm. The base material is ISO3183L450 carbon steel according to ISO standard, the corrosion-resistant inner lining is UNS N06625 nickel-based alloy, and the thickness of the corrosion-resistant inner lining is 4mm. The operation steps are as follows:

[0073] 1. Preparation process before welding:

[0074] 1) Groove production: use the method of machining + grinding to process double-sided composite grooves. The structure of double-sided composite grooves is as follows: figure 1 shown. One side of the outer groove located on the side of the carbon steel matrix 7 is a single-V compound groove with a slope 2 of the lower groove of 40 degrees, a slope 1 of the upper groove of 12.5 degrees, and a slope 6 of the other side of 32.5 degrees. The blunt edge 8 of the single-V composite groove is 3mm, the groove gap 10 is 4mm, the connection between the lower groove and the upper groove on the outer groove side is ...

Embodiment 3

[0103] The specification of bimetallic composite pipe is Φ1016mm×75mm, in which the carbon steel substrate is API 5L X65 carbon steel adopting API standard, the corrosion-resistant inner lining is UNS N06625 nickel-based alloy, and the thickness of the corrosion-resistant inner lining is 5mm; the operation steps are as follows:

[0104] 1. Preparation process before welding:

[0105] 1) Groove production: use the method of machining + grinding to process double-sided composite grooves. The structure of double-sided composite grooves is as follows: figure 1 shown. One side of the outer groove located on the side of the carbon steel matrix 7 is a single-V compound groove with a slope 2 of the lower groove of 40 degrees, a slope 1 of the upper groove of 12.5 degrees, and a slope 6 of the other side of 32.5 degrees. The blunt edge 8 of the single-V composite groove is 3mm, the groove gap 10 is 5mm, the connection between the lower groove and the upper groove on the outer groove s...

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Abstract

The invention provides a bimetal composite pipe both-side welding process. The process comprises (1) preparations before welding; (2) matrix bottom seal welding; (3) carbon steel matrix thermal weld bead welding; (4) carbon steel matrix filling and cover welding; (5) anti-corrosion lining slope grinding and cleaning; (6) anti-corrosion lining overlaying. The process has the advantages of being high in welding quality, small in labor intensity, low in construction cost and high in production efficiency and particularly applicable to welding of oceaneering composite vertical pipes, liquefied natural gas low-temperature high-pressure anti-corrosion pipes, oil and gas pipes, heating furnace pipes, chemical pipes and the like and applicable to deepwater composite pipe and pressure containing welding.

Description

technical field [0001] The invention relates to a welding process method, in particular to a process method for double-sided welding of a bimetal composite pipe. Background technique [0002] With the deepening of oil and gas field development, the corrosion environment faced by surface pipelines is getting worse and worse, especially in some high-H content 2 S / CO 2 In oil and gas fields in China, the corrosion of surface pipelines is very serious. Ordinary carbon steel is incompetent, and corrosion-resistant alloys are expensive. The advent of bimetallic composite pipes has found an effective solution. [0003] Bimetal composite pipes are widely used, mainly used for offshore oil drilling platform piping, conveying pipes, heating furnace pipes, high temperature and high pressure boiler pipes, chemical pipes, etc. [0004] Welding is one of the key technologies in the manufacture and application of bimetal composite pipes. For the welding of bimetallic composite pipes, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/167B23K9/18B23K9/235B23K9/00B23K9/02B23K33/00B23K101/06
Inventor 牛勇温志刚田雷韦生靳伟亮蔡新荣吕志军王体刚陆传航陈哲费东
Owner CHINA NAT OFFSHORE OIL CORP
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