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Welding method for multistage circular welds of medium and thin wall variable-diameter aluminum alloy shell

A welding method and technology of aluminum alloy, applied in welding equipment, welding equipment, auxiliary welding equipment, etc., can solve problems such as failure to meet product use requirements, low quality of shell welds, overall deformation of the shell, etc., to reduce welding defects The probability of occurrence, the effect of improving preheating and welding efficiency, reducing heat input

Inactive Publication Date: 2014-02-05
CHINA WEAPON SCI ACADEMY NINGBO BRANCH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the improper design of the welding groove, imperfect welding process and welding tooling in the traditional process, the quality of the weld seam of the shell is low, and it is easy to produce welding defects such as pores, inclusions, welding cracks and incomplete penetration, especially welding deformation, involving multiple rings The mutual influence of the welding seams leads to serious deformation of the shell as a whole, which cannot meet the requirements of the product.

Method used

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  • Welding method for multistage circular welds of medium and thin wall variable-diameter aluminum alloy shell
  • Welding method for multistage circular welds of medium and thin wall variable-diameter aluminum alloy shell
  • Welding method for multistage circular welds of medium and thin wall variable-diameter aluminum alloy shell

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Effect test

Embodiment 1

[0041] Example 1, such as figure 1 As shown, the aluminum alloy shell in this embodiment includes a first sleeve 2a and a second sleeve 3a welded to each other in sequence, the inner diameter of the first sleeve 2a is larger than the inner diameter of the second sleeve 3a, and the outer diameter of the first sleeve 2a The end is welded with a large flange 1a, and the outer end of the second sleeve 3a is welded with a small flange 4a.

[0042] Such as figure 2 As shown, the welding tool in this embodiment includes a mandrel 1 , a first positioning seat 2 , a second positioning seat 7 , a tie rod 4 , a large-end support seat 3 , a middle-end support seat 5 and a clamping block 8 .

[0043] The first positioning seat 2 is arranged on the mandrel and can rotate around the mandrel 1, and is used for positioning the large flange 1a, and the second positioning seat 7 is arranged at intervals with the first positioning seat 2, and is used for positioning the small flange 4a; the pul...

Embodiment 2

[0054] Embodiment 2. In this embodiment, a 7A05 aluminum alloy variable-diameter shell with a wall thickness of 4.0 mm and four-stage girth welds is welded. It includes the following steps:

[0055] (1) Welding joint design and welding method design: Welding joints are determined not to open grooves, and single-sided welding and double-sided forming are adopted by welding processes such as variable polarity. The welding seam assembly gap is set to 0mm, the welding gun does not move, and the shell rotates. (2) Cleaning: acid-base cleaning of large, medium, small tubes and flanges of aluminum alloy shells that need to be welded; (3) Assembly: place the porcelain lining blocks on the four-stage mobile support Seat, then assemble and position the shell parts on the special welding tool at one time, and adjust the mandrel to support the shell from the inside; (4) Secondary cleaning: use dry compressed air to blow the four-stage weld to be welded before welding (5) Preheating: no p...

Embodiment 3

[0056] Embodiment 3. In this embodiment, a 5A06 aluminum alloy variable-diameter shell with a wall thickness of 12.0 mm and three-stage girth welds is welded. It includes the following steps:

[0057] (1) Welding joint design and welding method design: Welding joints are determined to open a 30° groove, adopt welding processes such as polarity change, single-sided welding and double-sided molding, set the welding seam assembly gap to 0mm ~ 1.0mm, and the welding torch does not move. Preheating and welding of the shell rotation; (2) Cleaning: acid-base cleaning of the large and small aluminum alloy shells and flanges that need to be welded; (3) Assembly: place the porcelain lining blocks on the three-stage mobile support Seat, then assemble and position the shell parts on the special welding tool at one time, and adjust the mandrel to prop up the shell from the inside; (4) Secondary cleaning: before welding, use dry compressed air to blow the tertiary weld to be welded ; (5) P...

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Abstract

A welding method for multistage circular welds of a medium and thin wall variable-diameter aluminum alloy shell is characterized by including the steps: designing a welding connector; performing primary cleaning; protecting weld backs; performing assembly; performing secondary cleaning; preheating and welding the aluminum alloy shell by the aid of an automatic variable polarity plasma welding machine; reducing the temperature of the shell to the indoor temperature in a natural cooling mode after the multistage circular welds are welded. Compared with a traditional tungsten argon arc welding process, a variable polarity plasma welding process has the advantages that a groove is omitted or a small groove is formed, particularly, a welding groove is omitted when the wall thickness of the aluminum alloy shell is smaller than 10mm, the aluminum alloy shell can be welded once, so that heat input is reduced, the probability of welding defects is decreased, preheating and welding are realized by the aid of the same device, preheating and welding efficiency is improved, and welding cost is reduced.

Description

technical field [0001] The invention relates to a welding method and belongs to the technical field of welding. Background technique [0002] Due to the needs of product lightweight, structural design, cost control, etc., many structural parts for storage and transportation now use medium-thin-wall variable-diameter aluminum alloy shells with a thickness between 2.0mm and 20.0mm, involving cylinders with different diameters. The welding of the multi-stage girth weld between the shell and the flange. Due to the improper design of the welding groove, the imperfect welding process and welding tooling in the traditional process, the quality of the weld seam of the shell is low, and it is easy to produce welding defects such as pores, inclusions, welding cracks and incomplete penetration, especially welding deformation, involving multiple rings The mutual influence of the welding seams leads to serious deformation of the shell as a whole, which cannot meet the requirements of th...

Claims

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Application Information

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IPC IPC(8): B23K10/02B23K33/00B23K37/04B23K37/00
CPCB23K10/02B23K33/004B23K37/047
Inventor 陈东高马志华王秀玲王法科明珠陈东亮杨武林任宝辉刘红伟马冰王冬生张立君聂砂
Owner CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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