Process method of double-sided welding of bimetal composite pipe

A bimetal composite pipe and double-sided welding technology, which is applied in metal processing equipment, welding equipment, manufacturing tools, etc., can solve the problems of high cost and low welding efficiency, reduce the cost of welding materials, improve welding efficiency, and reduce filling The effect of proportion

Active Publication Date: 2017-07-11
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

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  • Process method of double-sided welding of bimetal composite pipe

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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 the bimetal composite pipe is Φ1016mm×75mm, in which the carbon steel substrate is API 5LX65 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 double-sided welding process for a bimetallic composite pipe, comprising: (1) pre-welding preparation process; (2) carbon steel substrate bottom sealing welding process; (3) carbon steel substrate hot bead welding process; (4) ) Carbon steel matrix filling and cover welding process; (5) Corrosion-resistant inner lining groove grinding and cleaning; (6) Corrosion-resistant inner lining surfacing; with high welding quality, low labor intensity, low construction cost and production The advantage of high efficiency is especially suitable for the welding of marine engineering composite risers, low-temperature and high-pressure corrosion-resistant pipelines for liquefied natural gas, oil and gas pipelines, heating furnace pipes and chemical pipes, etc., which have harsh working conditions and high material requirements. It is suitable for the welding of deep water composite pipelines and pressure vessels.

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 Patents(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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