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Positioning device and welding method for butt welding of thin-walled tubes

A technology of positioning device and welding method, applied in welding equipment, welding accessories, laser welding equipment, etc., can solve the problems of high scrap rate and difficult positioning of thin-walled pipe welding, so as to reduce scrap rate and cost, and improve the overall welding Efficiency, the effect of improving efficiency

Active Publication Date: 2020-08-28
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a positioning device and welding method for butt welding of thin-walled pipes to solve the problems of difficult positioning and high reject rate of butt welding of thin-walled pipes in view of the problems existing in the prior art

Method used

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  • Positioning device and welding method for butt welding of thin-walled tubes
  • Positioning device and welding method for butt welding of thin-walled tubes

Examples

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Effect test

Embodiment 1

[0037] A tungsten thin-walled tube has an outer diameter of 14mm, a wall thickness of 0.5mm, and a length of 100mm. Two pieces are butt-welded by electron beam self-fusion. The specific method is as follows:

[0038] Positioning device: The positioning device includes a mandrel, a plug, a spring and a fastening nut. One end of the mandrel is the clamping part of the chuck, which is designed as a cylinder with a diameter of 14mm. Four cam structures are designed and processed on the mandrel. The width of the cam structure along the mandrel axis is 5mm. Each cam structure includes three protrusions evenly distributed in the circumferential direction, where α is 90°, the major diameter D is 13 mm, and the minor diameter d is 11 mm. The distance between two adjacent cam structures at the butt weld of the thin-walled pipe is 3mm.

[0039] Installation and welding method: Set two thin-walled tubes on the mandrel in turn to ensure that the end faces are in close contact; install the...

Embodiment 2

[0041] A TZM alloy thin-walled tube has an outer diameter of 20mm, a wall thickness of 1mm, and a length of 80mm. The same three tubes are installed at one time for laser self-fluxing butt welding. The specific method is as follows:

[0042] Positioning device: The positioning device includes a mandrel, a plug, a spring and a fastening nut. One end of the mandrel is the clamping part of the chuck, designed as a cylinder with a diameter of 20mm, and 6 cam structures are designed and processed on the mandrel, and the width of the cam structure along the mandrel axis is 8mm. The cam structure includes three protrusions evenly distributed in the circumferential direction, where α is 100°, the major diameter D is 18 mm, and the minor diameter d is 16 mm. The distance between two cam structures at the butt weld of adjacent thin-walled pipes is 5 mm.

[0043] Installation and welding method: Set three thin-walled tubes on the mandrel in turn to ensure close contact between the end fa...

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Abstract

The invention relates to a positioning device and a welding method for butt welding of thin-walled tubes. The positioning device comprises a core rod, wherein a thin-walled tube to be welded sleeves the core rod, one end of the core rod is a clamping part, the other end of the core rod is provided with a jacking mechanism, the core rod is provided with a plurality of cam structures for supportingthe thin-walled tube, each cam structure comprises a plurality of protruding parts distributed in the circumferential direction of the core rod, and the outer circumferential face of each cam structure can be tightly matched with the inner wall face of the thin-walled tube. The problems that butt welding positioning of thin-walled tubes is difficult and the rejection rate is high are solved, mounting operation is easy and efficient, and the risk of demolition damage is reduced.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a positioning device and a welding method for butt welding of thin-walled pipes. Background technique [0002] For the butt welding technology of thin-walled refractory metal pipes, thin-walled pipes with a wall thickness of ≤ 1mm require butt welding without filler wire, and processing and matching spigots are not allowed. The thin-walled pipes on both sides of the butt joint must be strictly coaxial, and no overlap , Misalignment or distortion, to ensure coaxiality and straightness. At the same time, due to the poor toughness and plasticity of the refractory metal thin-walled tube and the high welding temperature, the rigid positioning method of direct chuck clamping and axial top fastening is very prone to welding stress deformation and cracking. Butt positioning tooling and welding methods for thin-walled pipes have always been difficult in the welding field, an...

Claims

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Application Information

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IPC IPC(8): B23K9/00B23K9/16B23K9/32B23K15/00B23K26/282B23K26/70B23K101/06
CPCB23K9/0035B23K9/0052B23K9/16B23K9/32B23K15/0006B23K15/0013B23K26/282B23K26/702B23K2101/06
Inventor 张国栋郑剑平张征王振东
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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