A Laser Welding Process for Improving the Fitting Margin of Thin Plate Titanium Alloy Tailored Welding

A laser welding and titanium alloy technology, which is applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of restricting the development of laser tailor welding technology, increasing equipment investment, and increasing the weight of structural parts, so as to reduce gap sensitivity , Increase the cooling rate, improve the effect of weld forming quality

Active Publication Date: 2022-03-15
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, for production occasions with strict requirements for lightweight components and welding procedures, the weight gain and post-weld machining of structural parts caused by wire filling are not allowed; in addition, the laser wire filling process increases equipment investment and increases production costs.
[0005] At present, the problem of assembly margin of thin-plate titanium alloy under the condition of pure laser welding process has not been well solved, which restricts the development of laser tailor welding technology to a certain extent.

Method used

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  • A Laser Welding Process for Improving the Fitting Margin of Thin Plate Titanium Alloy Tailored Welding
  • A Laser Welding Process for Improving the Fitting Margin of Thin Plate Titanium Alloy Tailored Welding
  • A Laser Welding Process for Improving the Fitting Margin of Thin Plate Titanium Alloy Tailored Welding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1.2mm Ti6A14V titanium alloy thin plate is used as the welding base material, and the sample size is processed to 100mm×50mm by wire cutting. The ruler sets the assembly gap to 0.2mm.

[0022] The welding adopts Trumpf Trudisc 4001 disc laser, the laser power is 2.2kW, the welding speed is 1.8m / min, the pulse frequency is 20Hz, the duty cycle is 0.6, the defocus amount is 0, and the focal spot diameter is 700μm. The pulse waveform is the default waveform of the laser, such as figure 2 As shown; the protective gas is pure Ar, the surface flow rate is 30L / min, and the back flow rate is 15L / min.

[0023] After welding, photograph the weld surface and root formation; prepare weld metallographic samples through processes such as wire cutting, inlaying, grinding, polishing, and corrosion, and photograph the cross-sectional metallographic appearance.

Embodiment 2

[0025] 1.2mm Ti6A14V titanium alloy thin plate is used as the welding base material, and the sample size is processed to 100mm×50mm by wire cutting. The ruler sets the assembly gap to 0.3mm.

[0026] The welding adopts Trumpf Trudisc 4001 disc laser, the laser power is 2.4kW, the welding speed is 1.8m / min, the pulse frequency is 20Hz, the duty cycle is 0.6, the defocus amount is 0, and the focal spot diameter is 700μm. The pulse waveform is the default waveform of the laser, such as figure 2 As shown; the protective gas is pure Ar, the surface flow rate is 30L / min, and the back flow rate is 15L / min.

[0027] After welding, photograph the weld surface and root formation; prepare weld metallographic samples through processes such as wire cutting, inlaying, grinding, polishing, and corrosion, and photograph the cross-sectional metallographic appearance.

[0028] The surface and back appearance of the welded joint obtained in embodiment 1-2 are as follows: image 3 As shown, th...

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Abstract

The invention discloses a laser welding process for improving the assembly margin of thin-plate titanium alloy tailor welding, which belongs to the technical field of high-energy beam welding. This process aims at the instability of the groove gap caused by factors such as machining burrs, assembly errors, and thermal deformation in the laser tailor welding process of thin plates, resulting in problems such as welding deviation and missing welding. The spot size of the focal spot increases the cooling rate of the welding spot while obtaining sufficient amount of interstitial metal, and realizes the non-filling laser welding of 1.2mm thick titanium alloy under the condition of 0.2‑0.3mm tailor welding assembly gap, and the weld seam The continuity and uniformity are good, there is no obvious welding defect, and the effective assembly gap reaches 25% of the plate thickness. This process can significantly reduce the gap sensitivity of laser welding of sheet metal and improve the quality of weld seam formation. The invention has great significance for promoting the application and development of the laser welding technology in the thin plate tailor welding field.

Description

technical field [0001] The invention proposes a laser welding process for improving the assembly margin of thin-plate titanium alloy tailor welding, which belongs to the technical field of high-energy beam welding, and is suitable for tailor-weld thin-plate titanium alloy under the condition of plane assembly gap or unstable gap. Background technique [0002] Titanium alloy has a high strength-to-weight ratio and good corrosion resistance and creep resistance, and has been widely used in aerospace, nuclear energy, transportation, biomedicine and other industrial fields. Laser deep penetration welding has the advantages of small heat input, small welding deformation, narrow heat-affected zone, and fine grain structure, and is especially suitable for tailor welding of thin-plate titanium alloy components. [0003] However, in actual welding production, due to machining burrs, tooling errors, and welding thermal deformation, the welding assembly gap of thin-plate titanium alloy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/24B23K26/14B23K103/14
CPCB23K26/24B23K26/14B23K2103/14
Inventor 陈纪城杜心伟孔斌陈小梅魏艳红刘学军
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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