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Sealing method for tube end of carbon steel/stainless steel composited tube

A stainless steel and composite pipe technology, applied in welding/welding/cutting items, welding equipment, welding media, etc., can solve the problem of high welding pass rate, achieve high welding pass rate, reduce the difficulty of sealing and welding, and reduce the effect of difficulty

Active Publication Date: 2011-01-26
XIAN SUNWARD AEROSPACE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a pipe end sealing and welding method for carbon steel / stainless steel composite pipes in view of the deficiencies in the above-mentioned prior art. It can effectively solve various practical problems existing in the existing composite pipe end sealing welding method.

Method used

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  • Sealing method for tube end of carbon steel/stainless steel composited tube
  • Sealing method for tube end of carbon steel/stainless steel composited tube
  • Sealing method for tube end of carbon steel/stainless steel composited tube

Examples

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Effect test

Embodiment 1

[0037] In this embodiment, the carbon steel / stainless steel composite pipe that is sealed and welded is a composite pipe composed of a stainless steel lining pipe 1 made of 316L stainless steel and a carbon steel base pipe 2 made of 20G carbon steel, and its specification is Φ76×(7+2)mm.

[0038] Step 1. Using conventional machining methods, remove a section of 10mm-long stainless steel lining pipe 1 from the outside to the inside at the end of the carbon steel / stainless steel composite pipe to be sealed and welded. In actual operation, a lathe is generally used to remove a section of 10mm-long stainless steel lining pipe 1 at the end of the carbon steel / stainless steel composite pipe to be sealed and welded.

[0039] Step 2: Process the inner side of the exposed carbon steel base pipe 2 after removing the stainless steel lining pipe 1 into an inwardly inclined slope from the outside to the inside, and the slope angle α of the slope is 5°, see figure 2 .

[0040] Step 3. Un...

Embodiment 2

[0044] In this embodiment, the carbon steel / stainless steel composite pipe that is sealed and welded is a composite pipe composed of a stainless steel lining pipe 1 made of 316L stainless steel and a carbon steel base pipe 2 made of 20G carbon steel, and its specification is Φ56×(5+1.5)mm. The difference from Example 1 is that in step one, a mechanical processing method is used to remove a section of stainless steel lining pipe 1 with a length of 8 mm from the outside to the inside at the end of the carbon steel / stainless steel composite pipe to be sealed and welded; in step two, by The inclination angle α of the inclined surface processed from the outside to the inside is 3°; the welding current during the surfacing welding in step 3 is 90A, and the flow rate of the shielding gas used in the welding process is 13L / min. After the surfacing welding is completed, a total of 3 layers of stainless steel surfacing welding layers 3 are formed on the inclined surface from inside to o...

Embodiment 3

[0047] In this embodiment, the carbon steel / stainless steel composite pipe that is sealed and welded is a composite pipe composed of a stainless steel lining pipe 1 made of 316L stainless steel and a carbon steel base pipe 2 made of 20G carbon steel, and its specification is Φ96×(9+3)mm. The difference from Example 1 is: in step one, a conventional mechanical processing method is used to remove a section of stainless steel liner pipe 1 with a length of 13 mm from the outside to the inside at the end of the carbon steel / stainless steel composite pipe; in step two, from the outside to the inside The inclination angle α of the bevel processed inside is 8°; the welding current during the surfacing welding in step 3 is 90A, and the flow rate of the shielding gas used in the welding process is 17L / min. After the surfacing welding is completed, a total of 5 layers of stainless steel surfacing welding layers 3 are formed on the inclined surface from inside to outside.

[0048] In thi...

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Abstract

The invention discloses a sealing method for a tube end of a carbon steel / stainless steel composited tube. The sealed carbon steel / stainless steel composited tube is composed of a stainless steel lining tube and a parenttube made from carbon steel sleeved outside of the stainless steel lining tube. The method comprises the following steps: 1, 8-13mm of the stainless steel lining tube is removed from outside to inside at an end part of the carbon steel / stainless steel composited tube to be sealed; 2, the inner side of the exposed parenttube made from carbon steel, after a section of the stainless steel lining tube is removed, is machined from outside to inside into an inclined surface inclined inwards and with 3-8 degrees of the inclined angle thereof; 3, sealing: in protection of inert gases, the inclined surface is overlaid from inside to outside through a tungsten electrode argon arc welding machine and then formed into a multi-layer stainless steel overlaying layer; and 4, the inner wall and an external port of the multi-layer stainless steel overlaying layer are processed. The sealing technique provided by the invention has the advantages of simple procedure, easily-controlled sealing technique, less welding material and high percentage of welding qualification rate, and can effectively solve problems existing in the tube end of the clad tube.

Description

technical field [0001] The invention belongs to the technical field of pipe end treatment of carbon steel / stainless steel composite pipes, and in particular relates to a method for sealing and welding pipe ends of carbon steel / stainless steel composite pipes. Background technique [0002] Most of the existing composite pipe end sealing and welding technologies are to carve out the groove at the pipe end of the base pipe first, then leave a certain length of blunt edge on the liner, and finally perform sealing welding at the junction of the groove and the blunt edge . In the actual application process, the disadvantages of the above-mentioned process are: [0003] 1. The welding process is not well controlled. When the liner is a thin-walled alloy tube, it is easy to be burned through by the arc. [0004] 2. The quality of sealing and welding is not high, and defects are prone to occur in the sealing and welding parts. [0005] 3. The one-time pass rate of flaw detection o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/32B23K9/167B23K9/095B23K9/04B23K33/00B23K101/06B23K35/30B23K9/235B23K103/04
Inventor 张燕飞王小艳潘建新刘凯史万华
Owner XIAN SUNWARD AEROSPACE MATERIAL CO LTD
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