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Welding method for eliminating pore defects of aluminum alloy electron beam weld joint

An electron beam welding seam and welding method technology, which is applied in the welding field of eliminating porosity defects of aluminum alloy electron beam welding seam joints, can solve the problems of unsatisfactory welding seam quality, large tendency of liquid aluminum pinholes, reducing material compactness and the like, Achieve high appearance quality, promote the escape of pores, and prolong the liquid time.

Pending Publication Date: 2020-04-17
BEIJING HANGXING MACHINERY MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Adding a strontium modifier to the cast aluminum alloy can improve the fluidity of the alloy, which is beneficial to the control of the wall thickness of the complex structure cabin, but the strontium modification will cause the alloy to absorb hydrogen and increase the pinhole degree of the casting, making the pinhole tendency of the aluminum liquid more prone. Large, reducing the compactness of the material
During electron beam welding, the solubility of hydrogen atoms in the liquid molten pool is relatively high, and the solubility decreases sharply during the cooling process. The pinhole effect in the base metal makes it easier for the bubbles in the molten pool to nucleate and gather. Due to the welding speed of vacuum electron beam welding Fast, the accumulated bubbles have no time to escape from the molten pool, and a large number of dense large-sized pores often appear, and the quality of the weld cannot meet the requirements of the I-level welding standard of GJB1718A-2005 "Electron Beam Welding"
In view of this problem, there is no relevant literature to propose a corresponding solution

Method used

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  • Welding method for eliminating pore defects of aluminum alloy electron beam weld joint
  • Welding method for eliminating pore defects of aluminum alloy electron beam weld joint
  • Welding method for eliminating pore defects of aluminum alloy electron beam weld joint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The ZL114A cast aluminum alloy test plate is selected, and the bottom lock joint is adopted, the thickness of the butt joint is 10mm, and the thickness of the bottom lock is 3mm.

[0054] Before welding, use a scraper to scrape the butt surface of the test plate, and grind the surface of the weld with a width of 10-15mm, grind until the surface shows metallic luster, and clean the parts to be welded;

[0055] Use welding tooling to assemble the test plate to be welded on the tooling frame, send the test plate to be welded into the vacuum chamber, and evacuate to make the vacuum degree reach 6×10 -4 mbar;

[0056] Vacuum electron beam welding is performed on the test plate, including tack welding, deep penetration welding, remelting welding, and modification welding. The electron beam is welded in the form of "8" swing scanning; the welding parameters are shown in the table:

[0057] Table 1 Vacuum electron beam welding parameters

[0058]

[0059]

[0060] After...

Embodiment 2

[0064] It is implemented on a certain type of fuel tank cylinder. The outer diameter of the welding part is 560mm, and the material is ZL114A cast aluminum alloy with strontium modifier. The cylinder body to be welded is a bottom-lock joint structure, with a butt thickness of 25mm and a bottom-lock thickness of 5mm. The specific welding method is as follows:

[0065] Cleaning of the part to be welded on the cylinder: use a scraper to scrape the butt surface of the test plate before welding, and grind the surface of the weld with a width of 15mm until the surface shows a metallic luster, and then clean the part to be welded with anhydrous alcohol;

[0066] Use aluminum alloy welding tooling to butt and assemble the cylinders together, adjust the working distance between the electron gun and the surface of the weld to be 400mm, the butt step difference during welding is ≤0.3mm, and the butt gap is ≤0.2mm, and the workpiece to be welded is hoisted to the electron beam welding mach...

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Abstract

The invention provides a welding method for eliminating pore defects of an aluminum alloy electron beam weld joint. The vacuum electron beam welding method is applied to the welding method, welding isperformed through electron beams in the form of swing scanning, an 8-shaped scanning trace serves as a repeating unit in a scanning trajectory formed through swing scanning, and the scanning trajectory is formed by arraying the 8-shaped scanning traces in a staggered mode, wherein the longitudinal direction of the 8-shaped scanning traces is the direction of the weld joint, and the transverse direction of the 8-shaped scanning traces is perpendicular to the direction of the weld joint. The welding method is suitable for materials with large pinhole inclination and poor compactness caused whencast aluminum alloy absorbs hydrogen due to the addition of a strontium alterant, can also be suitable for welding ordinary cast aluminum alloy, is wide in application range, has a magnificent effectof eliminating pores, and greatly enhances the tensile strength of the weld joint.

Description

technical field [0001] The invention belongs to the technical field of welding, and relates to a welding method, in particular to a welding method for eliminating porosity defects of aluminum alloy electron beam welded seam joints. Background technique [0002] Adding strontium modifier to the cast aluminum alloy can improve the fluidity of the alloy, which is beneficial to the control of the wall thickness of the complex structure cabin, but the strontium modification will cause the alloy to absorb hydrogen and increase the pinhole degree of the casting, making the aluminum liquid more prone to pinholes. large, reducing the density of the material. During electron beam welding, the solubility of hydrogen atoms in the liquid molten pool is relatively large, and the solubility decreases sharply during the cooling process. The pinhole effect in the base metal makes the bubbles in the molten pool easier to nucleate and aggregate. Fast, the accumulated bubbles have no time to e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K15/00B23K15/06
CPCB23K15/002B23K15/0053B23K15/06B23K2103/10
Inventor 王毅王志敏孙少波任金欣谈哲君李保永韩博文齐才榜
Owner BEIJING HANGXING MACHINERY MFG CO LTD
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