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X-shaped groove welding process for corrosion-resistant alloy composite tube

A corrosion-resistant alloy, groove welding technology, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of unfavorable corrosion-resistant alloy composite pipe welding process, large amount of filler materials, etc., to improve welding operation efficiency, The effect of saving consumption and improving the success rate of welding

Inactive Publication Date: 2021-03-05
SICHUAN GASOLINEEUM CONSTR ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above two groove forms are not conducive to the implementation of the welding process for the internal welding of corrosion-resistant alloy composite pipes during the welding process.
Moreover, the amount of filler material used during welding is large, which is not conducive to the implementation of the welding process for internal welding of corrosion-resistant alloy composite pipes.

Method used

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  • X-shaped groove welding process for corrosion-resistant alloy composite tube
  • X-shaped groove welding process for corrosion-resistant alloy composite tube
  • X-shaped groove welding process for corrosion-resistant alloy composite tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] image 3 A schematic flow chart of the method for visually measuring welding and controlling welding speed by using welding-like heat input in the present invention is shown.

[0055] Such as image 3 As indicated, the control of welding speed by visual measurement of welding using welding-like heat input may include the following steps:

[0056] Obtain the welding-like heat input H of electrode arc welding, and determine the fluctuation ratio ⊿H corresponding to the welding-like heat input. Here, the similar welding heat input is different from the conventional welding heat input, and this type of welding heat input can be used as a new definition to measure the welding heat input. Here, the welding method may be root welding, surfacing welding, filling welding or cover welding.

[0057] Electrode arc welding is performed with similar welding heat input as the welding speed, and visual measurement is used to control the welding speed within the range of H±⊿H. That ...

Embodiment 2

[0069] Figure 5 The experimental data graph of this specific example is shown.

[0070] Such as Figure 5 As shown, the welding process can be controlled simply and intuitively by using the welding-like heat input to realize the visual measurement control of the electrode arc welding method.

[0071] Determine the use of root welding, surfacing welding, filling welding or cover welding. Before use, the standard length of the used electrode is S=450mm. After three sets of tests, after the normal operation is completed, the remaining length of the electrode is R 1 =45mm, R 2 =50mm, R 3 =55mm, the cladding weld length of this electrode is L 1 =L 2 =L 3 =200mm. According to formula The welding-like heat input H=0.5 is obtained.

[0072] The fluctuation ratio is taken as 10%, and the welding heat input is used as the welding speed, and the normal speed range is 0.45 to 0.55. The experimental data are plotted as Figure 5 , then the values ​​between the upper and lower...

Embodiment 3

[0083] The repair process for the weld defect of the corrosion-resistant alloy composite pipe described in this exemplary embodiment requires a qualified welder to carry out the repair process according to the repair welding procedure.

[0084] The process of the present invention first needs to distinguish the defects that appear in the welds of each section to be repaired. The first defect type is arc crater crack defect, and the second defect type is root welding zone or transition layer. The third defect type is Crack defects other than the first and second defect types; the fourth defect type is non-crack defects other than the second defect type.

[0085] Next, different rework processes are respectively adopted for the first, second, third or fourth defect types.

[0086] For the first defect type (that is, arc crater crack defects), since arc crater cracks are thermal cracks, they can be found immediately during the welding process, and such cracks will not cause syste...

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Abstract

The invention provides an X-shaped groove welding process for a corrosion-resistant alloy composite tube which is provided with a corrosion-resistant alloy layer and a base material layer. The weldingprocess comprises the following steps: processing semi-X-shaped grooves at connecting tubes of two corrosion-resistant alloy composite tubes to be welded to form an X-shaped groove which is formed inthe whole peripheral direction of the corrosion-resistant alloy composite tube, wherein the axial section is provided with a first X-shaped groove and a second X-shaped groove symmetrical with the first X-shaped groove which comprises an upper funnel hole, a lower funnel hole and a transition section, the upper funnel hole being formed on the base material layer in the radial direction, the lowerfunnel hole being reversely formed on the corrosion-resistant alloy layer and one part, close to the corrosion-resistant alloy layer, of the base material layer in the radial direction, and the transition section being used for connecting the upper funnel hole to the lower funnel hole; and introducing protective gas for a certain time before welding, and welding the X-shaped groove. The X-shapedgroove welding process has the advantages of being beneficial for performing the welding process in the corrosion-resistant alloy composite tube and saving use amount of the filling material.

Description

technical field [0001] The invention relates to an X-shaped groove welding process for a corrosion-resistant alloy composite pipe, which is mainly used in the technical fields of welding and non-destructive testing of bimetallic composite pipes lined or coated with corrosion-resistant alloy (hereinafter referred to as CRA) in oil and gas fields. Background technique [0002] At present, in oil and gas field development projects, because the oil and natural gas transported contain more corrosive media, ordinary carbon steel pipes cannot meet the anti-corrosion performance requirements. Ordinary carbon steel + corrosion inhibitors only slow down the corrosion rate of pipelines. High cannot be promoted on a large scale. The stainless steel inner composite pipe makes full use of carbon steel. In this context, the bimetallic composite pipe lined or coated with corrosion-resistant alloys is characterized by its low price, good comprehensive mechanical properties and excellent corr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/235B23K9/16B23K33/00
CPCB23K9/235B23K9/16B23K33/00
Inventor 吴立斌罗泽松陈劲李阳段翱
Owner SICHUAN GASOLINEEUM CONSTR ENG
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