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Spiral seam submerged-arc welded pipe butt joint process

A technology of submerged arc welded pipe and spiral seam, which is applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of substandard steel pipe length, reduced yield and reduced yield, etc., to improve performance and reduce welding lines. Effects of energy, reduced tissue and performance effects

Active Publication Date: 2013-04-03
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For spiral welded pipes, as the diameter and wall thickness of steel pipes continue to increase, the contradiction between the coil weight and the length of the steel pipe becomes increasingly prominent; if the coil weight deviates greatly from the ideal value, short-length pipes will inevitably be produced, resulting in a reduction in the yield
And in the production process, many steel pipes are downgraded because the length of the steel pipes does not meet the standard due to reasons such as partial pipe body misalignment exceeds the standard, defect grinding wall thickness exceeds the standard, and base metal defects, which greatly reduces the yield

Method used

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  • Spiral seam submerged-arc welded pipe butt joint process
  • Spiral seam submerged-arc welded pipe butt joint process
  • Spiral seam submerged-arc welded pipe butt joint process

Examples

Experimental program
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Effect test

Embodiment 1

[0018] In this embodiment, the outer diameter of the steel pipe is F1016 mm, the wall thickness is 14.3 mm, and the manufacturing process steps of the butt joint of the material X70 steel grade spiral seam submerged arc welded pipe are as follows (see Table 1 for specific process parameters):

[0019] 1. Pipe end rounding and chamfering: transfer two short pipes that meet the standard length, round the end of the steel pipe, and then pour out the blunt edge size of 7mm through the chamfering equipment, the bevel angle is 25°, and the pipe sections are butted Finally, a 50° Y-shaped groove is formed.

[0020] 2. Steel pipe butt joint: Find the joint position of the two pipe sections on the frequency conversion driven rotating idler to ensure that the circumferential interval of the spiral weld at the pipe end meets the standard requirements (API Spec 5L requires that the minimum circumferential interval should be 50mm, West Gas East Input requirements 160mm ~ 800mm).

[0021] ...

Embodiment 2

[0040] In this embodiment, the outer diameter of the steel pipe is F1219mm, the wall thickness is 18.4mm, and the material is X80 steel grade spiral seam submerged arc welded pipe butt joint manufacturing. The manufacturing process steps of the submerged arc welded pipe are the same as in Example 1, and its specific implementation parameters are shown in Table 6 shown.

[0041] Table 6 Process parameters

[0042]

[0043] Table 7 Tensile test

[0044]

[0045] Table 8 Guided bending test

[0046]

[0047] Table 9 Impact toughness test

[0048]

[0049] Hardness measurement detection location map, as attached figure 2 shown;

[0050] Table 10 Hardness measurement results (ASTM E92-03)

[0051]

[0052] Provided in Table 7-10 are the main performance test results and main performance requirements of the actual object of the butt girth weld in this embodiment. It can be seen from the table that the butt girth weld of the spiral submerged arc welded pipe manufac...

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Abstract

The invention discloses a spiral seam submerged-arc welded pipe butt joint process and relates to the technical field of a spiral seam submerged-arc welded pipe. The process comprises the processing procedures of pipe end rounding, pipe end chamfering, steel pipe butt joint, prewelding, inner welding, outer welding, repair welding and circular seam nondestructive inspection. Compared with the traditional manual welding single-side welding double-sided forming process, the spiral seam submerged-arc welded pipe butt joint process has the advantages that the problems of welding quality stability influence and the like caused by great probability generation of defects such as air holes, slag clamping and cracks in the welding seam of the manual welding are solved, the butt joint quality and the efficiency of a steel pipe are greatly improved, the material consumption and the production cost can be greatly reduced, the field construction operation is convenient, and the batch production capability for producing butt joint pipes meeting API5L and relevant standard requirements is realized.

Description

technical field [0001] The invention relates to the technical field of spiral seam submerged arc welded pipes. Background technique [0002] The spiral submerged arc welded pipe is made by helically bending the steel coils according to a certain radius of curvature and then welding them together along the gap between the butt joints of the steel plates. Because the spiral seam submerged arc welded pipe has the advantages of low investment and many types of production, it has become the most widely used steel pipe manufacturing method in China. For spiral welded pipes, as the diameter and wall thickness of steel pipes continue to increase, the contradiction between the coil weight and the length of the steel pipe becomes increasingly prominent; if the coil weight deviates greatly from the ideal value, short-length pipes will inevitably be produced, resulting in a reduction in the yield. Moreover, in the production process, many steel pipes are downgraded because the length o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B23K9/16B23K9/18
Inventor 祁超王海生潘强李建明谢玉峰孙志敏谷海龙王洋陈楠郑青昊崔明亮李建一邓志伟李军
Owner BC P INC CHINA NAT PETROLEUM CORP
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