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Circumferential welding method for thin-wall pipeline parts

A technology for thin-walled pipes and parts, which is applied in the field of girth welding of thin-walled pipeline parts. It can solve problems such as poor joint consistency, rough surface of parts, and C”-shaped undercut of joints, etc., to meet the uniform width of welds. Sexual requirements, smooth transition of weld seam, good fusion effect

Active Publication Date: 2018-05-15
HARBIN DONGAN ENGINE GRP
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] After welding through the above steps, the surface of the parts is not smooth, the consistency of the joint after welding is not good, and the uniformity of the weld width reaches 0.8mm at most, which cannot meet the requirements, and the joint often appears "C" type undercut

Method used

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  • Circumferential welding method for thin-wall pipeline parts

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Experimental program
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Embodiment

[0033] The base material of the oil supply pipeline and pipe joint of an aero-engine is Z10CNT1811, the specification is φ8×0.8, and the ring welding method is adopted, and the welding method is adopted. It is required that "C" type undercut and "A" are not allowed to appear on the joint surface after welding. Type depression, the uniformity of the weld width does not exceed 0.16mm, no cracks, incomplete fusion and incomplete penetration are allowed inside the weld, and no leakage is allowed in the weld.

[0034] Its specific implementation method is:

[0035] (1) Processing pipe joints: process the pipe joints into an outer lock shape, the inner diameter of the outer lock shape position matches the outer diameter of the pipeline, and the thickness is 0.18mm;

[0036] (2) Check the pipeline: the deformation of the end of the pipe is 0.02mm, and the perpendicularity to the pipe axis is 0.04mm;

[0037] (3) Surface cleaning of parts: Clean the surface burrs after single-piece p...

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Abstract

The invention relates to a novel argon arc welding method for pipeline parts. According to the novel argon arc welding method, an original manual welding mode is changed, automatic welding is adopted,by means of reasonable parameters, weld joints can be guaranteed to be smooth, the internal fusion property of the weld joints is good, and no cracks are generated; and an external locking type pipejoint structure is adopted, and by means of an appropriate assembly use level, the problems that the sunken phenomenon occurs, and the width of the weld joints is not uniform can be solved. The devicemethod has the advantages that the automation degree is high, the welding quality is good, and the requirement for the uniformity of the width of the weld joints can be met.

Description

technical field [0001] The invention relates to a method for girth welding of pipeline parts, in particular to a method for girth welding of thin-walled pipeline parts. Background technique [0002] The girth welding method is a new type of welding method, which is a new technology, and mainly solves the problem of "C" type undercut, "A" type depression or manual argon arc welding that cannot obtain uniformity of weld width. At present, some aero-engine pipelines and pipe joints are connected by argon arc welding. The pipe wall thickness is 0.8mm. The base material is stainless steel and superalloy, and the specification is (φ6~φ24)×0.8. "C" type undercuts and "A" type depressions are not allowed in the joints, and the uniformity of the weld width does not exceed 0.16mm. The joint form of the pipeline and the pipe joint is butt joint, see figure 1 , using manual argon arc welding method for welding, the steps are: [0003] (1) Clean the surface burrs after single-piece pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/00B23K9/16B23K9/235
CPCB23K9/0035B23K9/16B23K9/235
Inventor 郑医徐磊康丽霞师玉英王广海张宇慧宋健陈健李佳韩帮宁
Owner HARBIN DONGAN ENGINE GRP