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All-position welding method for stainless steel pipeline for oil and gas transmission

A welding method and stainless steel technology, applied in welding equipment, welding equipment, auxiliary welding equipment, etc., can solve the problems of poor penetration of welding forming effect, affecting the crystal shape of welding materials, increasing welding current, etc., to achieve excellent protection effect, the gas pressure stress is small, and the effect of shortening the welder

Active Publication Date: 2019-10-08
江苏众信绿色管业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The structure of the above two automatic welding equipment is relatively simple, but because of increasing the welding current and using double wires for welding, the molten pool will increase, which will affect the crystal shape of the welding material, and eventually lead to poor welding forming effect and penetration
In addition, because of the large molten pool, the above-mentioned welding method is only suitable for horizontal welding, and there is a risk of molten material falling in vertical welding and overhead welding

Method used

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  • All-position welding method for stainless steel pipeline for oil and gas transmission
  • All-position welding method for stainless steel pipeline for oil and gas transmission

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 304 stainless steel pipe is selected, the diameter of the stainless steel pipe is 700mm≤Φ≤1100mm, the wall thickness of the pipe is 10mm≤h1≤15mm, the opening width between the grooves of two stainless steel pipes is 8mm≤h2≤12mm, and the width of the root gap between the grooves is 0.2mm≤h3≤ 0.5mm, blunt edge thickness 1.3mm≤h4≤2.0mm, two stainless steel pipe welding seam port reinforcement ≤1mm, double U-shaped bevel including slope one, arc one, slope two, arc two from outside to inside Section, the slope of the first section of the slope is greater than the slope of the second section of the slope, and the curvature of the first section of the arc surface is smaller than the curvature of the second section of the arc surface.

[0025] Specifically, the inclination angle of the first section of the inclined surface is 6°≤α≤12°, the inclination angle of the second section of the inclined surface is 15°≤β≤20°, the radius of the first section of the arc surface is 1 / 3h1≤R1...

Embodiment 2

[0033] After the groove of the stainless steel pipe is polished, the cut surface of the groove is pretreated. The specific operation is to clean the groove with 10wt% propanol aqueous solution, and then apply the pre-preparation and welding activator on the cut surface in turn. Pre-formulation coating amount is 0.4-0.7g / cm 3 , Welding activator adopts commercially available rosin flux for stainless steel, solid content is 4.3wt%.

[0034] Wherein, the pre-preparation is a pure acetone solution mixture containing carbon dioxide, wherein the carbon dioxide content is 3-5ml / g. The pure acetone solution adopts the grade of analytical grade, the carbon dioxide is mixed in a liquid state, and the pre-preparation mixing and application temperature is 20-30°C.

Embodiment 3

[0036] The stainless steel pipe adopts Φ800×12.4mm, with double U-shaped grooves, and the fixed-point weld distance is determined to be 8.5 ±0.5mm. The opening width between the grooves of two stainless steel pipes is 9.8mm, the width of the root gap between the grooves is 0.3mm, the thickness of the blunt edge is 1.8mm, the reinforcement height of the weld ports of the two stainless steel pipes is 0.88mm, and the first-stage inclination angle of the double U-shaped groove is α10°. The inclination angle of the second section of the inclined surface is β20°, the radius of the first section of the arc surface is 6.20mm, and the radius of the second section of the arc surface is 4.12mm (such as figure 1 ). Through the pretreatment operation of embodiment 2, then carry out welding, and concrete process is as follows:

[0037] Root welding parameters: the welding wire used is Φ1.2mm, the welding speed is 20±1cm / min, the wire feeding speed is 250±20cm / min, the welding voltage is 20...

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Abstract

The invention discloses an all-position welding method for a stainless steel pipeline for oil and gas transmission. The all-position welding method comprises the following steps: clearing pipeline inner and outer walls of the stainless steel pipeline, and grooving, wherein grooves adopt dual-U-shaped designs; grinding and clearing the grooves, performing point fixation on the pipeline, clamping the pipeline, and mounting an all-position welding machine along a welding seam; and setting welding parameters and performing sectional positioning welding according to a point fixation position. The pipeline wall thickness h1 of the stainless steel pipeline is greater than or equal to 10 mm and smaller than or equal to 15 mm, opening width h2 between two grooves of the stainless steel pipeline isgreater than or equal to 8 mm and smaller than or equal to 12 mm, and root clearance width h3 between the grooves is greater than or equal to 0.2 mm and smaller than or equal to 0.5 mm, and truncatededge thickness h4 is greater than or equal to 1.3 mm and smaller than or equal to 2.0 mm; and each dual-U-shaped groove comprises an inclined surface section I, an arc surface section I, an inclined surface section II and an arc surface section II from outside to inside. The all-position welding method reasonably optimizes pipeline welding parameters, reasonably improves a welding cut structure, effectively improves welding quality of the welding seam, improves welding fusion depth, weld bead thickness and welding efficiency, and has a welding qualification rate of 99.6%.

Description

technical field [0001] The invention relates to the technical field of pipeline processing, in particular to an all-position welding method for stainless steel pipelines for oil and gas transportation. Background technique [0002] In recent years, with the development of the western part of the country, domestic pipeline construction has also ushered in a peak period. Since the beginning of the West-East Gas Transmission Project in 2001, the installation and construction of domestic pipelines have begun to move closer to the international level, with large diameter , high-strength, high-pressure direction. At the same time, the pipeline welding technology, which is closely related to the quality of pipeline installation, has also begun to develop in the direction of fully automatic welding with high technical content, high quality and high efficiency. [0003] At present, oil and gas pipeline welding has transitioned from manual welding to semi-automatic welding and automa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K31/02B23K37/00
CPCB23K31/027B23K37/00
Inventor 孟宪虎姜庆风
Owner 江苏众信绿色管业科技有限公司
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