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Thick-wall chromium-molybdenum steel pipeline submerged arc welding technology

A welding process and wall chrome molybdenum steel technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as affecting the construction period of the project, failing to meet the needs of the project, etc., and achieve good welding seam forming quality and welding speed. , The effect of high welding production efficiency

Inactive Publication Date: 2011-11-23
SINOPEC THE FOURTH CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Large-scale and integrated devices require higher and higher professional construction levels and engineering construction capabilities. The pipeline welding project has become a "bottleneck" that affects the overall construction period of the project. Simply using traditional construction methods is far from meeting the needs of the project.

Method used

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  • Thick-wall chromium-molybdenum steel pipeline submerged arc welding technology
  • Thick-wall chromium-molybdenum steel pipeline submerged arc welding technology
  • Thick-wall chromium-molybdenum steel pipeline submerged arc welding technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] φ457.2×55.56mm chrome-molybdenum steel P22 pipeline submerged arc welding welding process:

[0024] 1. Bevel processing

[0025] The pipe lathe is used to complete the cutting and beveling of the pipe at one time. Using mechanical processing groove, groove processing quality is good, the utilization rate of machinery is high, and the cutting efficiency is high.

[0026] The bevel is in the form of a double V, see figure 2 , the groove angle of the lower V-shaped groove is α=65°, the groove surface angle of the upper V-shaped groove is β=10°, the thickness of the blunt edge is P=1.5mm, and the distance between the top surface of the lower V-shaped groove and the bottom surface of the base metal is Height h=19mm. The groove should be checked by 100% coloring, and it is qualified if there is no crack.

[0027] 2. Clean up the pair

[0028] Before assembling, use angle grinder, stick grinder or steel file to clean the rust and oil on the groove surface and edge area u...

Embodiment 2

[0044] The welding process of submerged arc welding of φ219×28.58mm chrome-molybdenum steel P22 pipeline is the same as that of Example 1, except that:

[0045] 1) The bevel form used is V-shape, and the bevel angle is α=60°, please refer to figure 1 .

[0046] 2) The pair gap is 2mm.

[0047] 3) The length of the positioning spot weld is 10mm and the thickness is 2mm.

[0048] 4) The welding process parameters are shown in Table 2.

[0049] Table 2 φ219×28.58mm chrome-molybdenum steel P22 pipeline submerged arc welding welding process parameters

[0050]

Embodiment 3

[0052] The welding process of submerged arc welding of φ219×26mm chrome-molybdenum steel P11 pipeline is the same as that of Example 1, except that:

[0053]1) The bevel form used is V-shape, and the bevel angle is α=60°, please refer to figure 1 , the group pair gap is 2mm.

[0054] 2) The length of the tack weld is 10mm and the thickness is 3mm.

[0055] 3) The preheating temperature before welding is 150℃~250℃.

[0056] 4) The welding wire grade selected for filling and cap welding is CHW-S11, the flux is SJ105, and the particle size is 10-60 mesh.

[0057] 5) The welding process parameters are shown in Table 3.

[0058] Table 3 φ219×26mm chrome molybdenum steel P11 pipeline submerged arc welding welding process parameters

[0059]

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Abstract

The invention discloses a thick-wall chromium-molybdenum steel pipeline submerged arc welding technology, which is characterized in that an automatic submerged arc welding is used for filling and welding a cover: a pipeline is placed on a rolling tire, an automatic submerged arc welder is used for welding the pipeline, the rolling tire is rotated to drive the pipeline to rotate during welding, and a welding gun is located at a flat welding position and always keeps still; welding parameters are as follows: the welding current is 240-500A, the voltage is 30-36.5V, the welding speed is 36-46.5 cm / min, the extension length of a welding wire is 8-12 mm, and a distance from a tail end of the welding wire to a weld surface is 5-6 mm. The average working efficiency by using the submerged arc welding technology to weld the thick-wall chromium-molybdenum steel pipeline is more than 4-6 times that of the manual welding, the thickness theta of a welding wall is more than the thick-wall pipeline of 30 mm, and the working efficiency is 8-12 times that of the manual welding.

Description

technical field [0001] The invention belongs to the technical field of pipeline welding, and particularly relates to a submerged arc welding welding process for thick-walled (δ≥20mm) chromium-molybdenum steel pipelines. Background technique [0002] A large number of thick-walled chromium-molybdenum steel pipes are welded in the construction of ethylene plants and oil refining plants in the petrochemical industry. The traditional welding method of thick-walled chrome-molybdenum steel pipe is manual argon arc welding for bottoming, and electrode arc welding for filling the cover surface; the traditional welding method has a large welding workload, long welding operation time, high labor intensity and low production efficiency. . As the petrochemical industry gradually changes from big to strong. The large-scale and integrated installations have higher and higher requirements for professional construction level and engineering construction capabilities. Pipeline welding has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18B23K9/235B23K9/12
Inventor 李雪梅
Owner SINOPEC THE FOURTH CONSTR
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