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A method for laser modification welding of titanium alloy welding seam using wave absorbing coating

A technology of wave absorbing coating and titanium alloy, applied in the field of laser modification welding, can solve the problems such as the inability to fundamentally eliminate the undercut of the weld, the large residual stress of the welding, the adverse effect on the performance, etc., and achieve good guiding significance and low welding stress. , conducive to the effect of spreading

Active Publication Date: 2018-02-27
AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current research can realize the optimization of the shape and performance of the weld seam, but it cannot fundamentally eliminate the undercut phenomenon of the weld seam
[0005] The existing laser decoration welding adopts the defocusing method to directly perform secondary remelting on the weld surface. Although the undercut defect on the weld surface can be eliminated, due to the secondary energy effect brought by the decoration welding, the workpiece after the decoration welding is severely damaged. Deformation, large welding residual stress
At the same time, due to the secondary remelting of the weld surface, impurities on the weld surface (such as welding fumes, oxides, etc.) are likely to cause a large number of micropores (<0.1mm), which will adversely affect the performance

Method used

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  • A method for laser modification welding of titanium alloy welding seam using wave absorbing coating
  • A method for laser modification welding of titanium alloy welding seam using wave absorbing coating
  • A method for laser modification welding of titanium alloy welding seam using wave absorbing coating

Examples

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Effect test

Embodiment 1

[0039] This embodiment provides a method for laser trim welding of titanium alloy weld seams by using a wave-absorbing coating, which includes the following steps:

[0040] 1) Pretreatment of the weld in the weld

[0041] Use alcohol or acetone to wipe the surface of the weld with undercut defects to remove the oil on the surface of the weld; then use a continuous laser (wavelength 1.6μm, power 2000W) to weld with a defocused laser spot The seam is scanned to remove the residual organic matter on the surface of the weld. During the scanning process, the diameter of the defocused laser spot is controlled to be 8mm, and the scanning speed is 1.2m / min;

[0042] 2) Apply a wave-absorbing coating to the weld position

[0043] NaF, Y 2 o 3 、Cr 2 o 3 , La 2 o 3The powder is mixed uniformly according to the mass ratio of 40%:20%:20%:20% to obtain a wave-absorbing coating; then the mixed powder and acetone are mixed into a suspension according to the mass ratio of 1:10, Use a b...

Embodiment 2

[0047] This embodiment provides a method for laser trim welding of titanium alloy weld seams by using a wave-absorbing coating, which includes the following steps:

[0048] 1) Pretreatment of the weld in the weld

[0049] Use alcohol or acetone to wipe the surface of the weld with undercut defects to remove the oil on the surface of the weld; then use a continuous laser (wavelength 1.6 μm, power 2200W) to weld with a defocused laser spot The seam is scanned to remove the residual organic matter on the surface of the weld. During the scanning process, the diameter of the defocused laser spot is controlled to be 6mm, and the scanning speed is 1.5m / min;

[0050] 2) Apply a wave-absorbing coating to the weld position

[0051] NaF, Y 2 o 3 、Cr 2 o 3 , La 2 o 3 The powder is mixed uniformly according to the mass ratio of 70%:10%:10%:10% to obtain a wave-absorbing coating; then the mixed powder and acetone are mixed according to the mass ratio of 1:10 to form a suspension, Us...

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Abstract

The invention provides a method for conducting laser modification welding on a titanium alloy weld joint through a wave absorbing coating. The method includes the steps that firstly, the weld joint is preprocessed; secondly, the weld joint is coated with the wave absorbing coating; thirdly, the weld joint is scanned through a defocusing laser spot, and the laser modification welding operation conducted on titanium alloy is completed, wherein the wave absorbing coating is prepared from, by mass, 40-70% of NaF2, 10-20% of Y2O3, 10-20% of Cr2O3 and 10-20% of La2O3. By means of the technical scheme, the undercut defects on the surface of the titanium alloy weld joint can be effectively eliminated, and residual stress of welding can be remarkably reduced.

Description

technical field [0001] The invention relates to a method for performing laser modification welding on a titanium alloy welding seam by using a wave-absorbing coating, and belongs to the technical field of laser processing. Background technique [0002] Compared with conventional welding methods, laser welding has high energy density, concentrated heating, small thermal damage to materials, large weld depth-to-width ratio, low residual stress in welded joints, and high welding precision, which can significantly reduce post-weld processing. It is easy to be integrated, automated, and flexible. It is a high-speed, high-precision, and efficient high-energy beam welding method. The quality of the welded joints is comparable to that of electron beam welding, but it does not require a vacuum environment and does not generate X-rays. It is one of the advanced manufacturing technologies. Laser welding between titanium alloy skin structure parts is commonly used in engineering applica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/36B23K26/06
CPCB23K26/06B23K35/3605B23K2103/14
Inventor 王彬巩水利陈俐段爱琴陈新松赵晓龙
Owner AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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