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A dual-beam laser swing welding method for suppressing welding cracks in high-strength titanium alloys

A technology of welding cracks and welding methods, which is applied in the field of double-beam laser swing welding for suppressing welding cracks of high-strength titanium alloys, can solve problems such as welding cracks and pore defects of high-strength titanium alloys, and achieve improved mechanical properties, increased swing space, fine The effect of grain

Active Publication Date: 2022-03-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of high-strength titanium alloy welding cracks and pore defects, especially the current swing laser welding method cannot solve the problems of high-strength titanium alloy welding cracks and pore defects

Method used

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  • A dual-beam laser swing welding method for suppressing welding cracks in high-strength titanium alloys
  • A dual-beam laser swing welding method for suppressing welding cracks in high-strength titanium alloys
  • A dual-beam laser swing welding method for suppressing welding cracks in high-strength titanium alloys

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Experimental program
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Effect test

Embodiment 1

[0040] The conventional oscillating laser welding and the method of the present invention are respectively used to weld a 2mm thick titanium alloy butt joint. The specific experimental method is as follows:

[0041] Conventional swing laser welding welds 3mm thick titanium alloy butt joints:

[0042] Step 1: process the parts to be welded of the workpiece to the required accuracy as required, and grind or clean the surfaces on both sides of the workpiece after processing;

[0043] Step 2: fixing the workpiece to be welded after grinding or cleaning on the welding fixture;

[0044] Step 3: The laser defocus is ﹢5mm, the laser power is 2100W, the welding speed is 1.0m / min, the swing trajectory is circular swing, the swing frequency is 150Hz, the swing amplitude is 3mm, the shielding gas is Ar gas, and the flow rate is 30L / min;

[0045] Step 4: In the actual welding process, the robot integrated system is used to control the welding process parameters. First, the laser is con...

Embodiment 2

[0047] The method of the present invention welds a 2mm thick titanium alloy butt joint:

[0048] Step 1: process the parts to be welded of the workpiece to the required accuracy as required, and grind or clean the surfaces on both sides of the workpiece after processing;

[0049] Step 2: fixing the workpiece to be welded after grinding or cleaning on the welding fixture;

[0050] Step 3: Set up double-beam lasers, wherein one laser light source is located at the front end of the welding pool, and the other laser light source periodically swings at the rear part of the welding pool to form a movement path; wherein, the movement path is "8" type path;

[0051] Select two points in the upper half of the 10-20% length area of ​​the "8"-shaped path near the front of the welding pool, marked as P1 and P 8, and select two points in the lower half, marked as P 4 and P 5; close to the welding pool Select two points in the upper half of the 10-20% length area of ​​the "8"-shaped path ...

Embodiment 3

[0060] The difference between this embodiment and embodiment 2 is: the laser defocus is ﹢15mm, the fixed laser power is 5000W, and the swing laser peak power P is 2500W; both P1 and P5 are 60%P, and both P2 and P6 are 40%P , P3 and P7 are all 100% P, P4 and P8 are both 75% P; the welding speed is 5m / min, the laser swing frequency is 400Hz, the swing length is 5mm, the swing width is 5mm, and the shielding gas adopts Ar gas and inert gas The mixed gas flow rate is 60L / min. Others are identical with embodiment 2.

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Abstract

A double-beam laser swing welding method for suppressing welding cracks in high-strength titanium alloys, which relates to the field of material processing engineering. The problem of welding cracks and porosity defects in titanium alloys. The present invention realizes double-beam laser welding by designing optical paths, one of which is fixed, and the other is swayed as an aid, and the above-mentioned welding defects are suppressed by simultaneously optimizing trajectory and energy distribution. Compared with the commonly used oscillating laser welding, it is more in line with the flow trend of the molten pool, which helps to strengthen the convection of the molten pool and reduce the defects of pore cracks; the swing amplitude is larger, the temperature gradient decreases, and the melt is replenished at the solidification front at the tail of the molten pool. Prevent solidification cracks; combine beam energy distribution and swing trajectory to improve temperature field distribution, reduce stress and deformation of joints, and inhibit crack initiation. The invention is applied in the field of material processing.

Description

technical field [0001] The invention belongs to the field of material processing engineering, and in particular relates to a double-beam laser swing welding method for suppressing welding cracks of high-strength titanium alloys. Background technique [0002] Since entering the 13th Five-Year Plan, my country is developing to a higher level and deeper level in the field of aerospace. The development of cutting-edge technology fields such as aerospace has put forward higher requirements for material performance, and continuously put forward higher requirements for weight loss and high temperature performance of service materials. Compared with structural materials such as aluminum, magnesium, iron, and nickel, titanium alloys are widely used in aircraft structures, aerospace industries, and military products due to their small mass, high specific strength and specific stiffness, good corrosion resistance, and excellent comprehensive performance. under manufacture. [0003] A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/21B23K26/06B23K26/064B23K26/08B23K26/60
CPCB23K26/21B23K26/0643B23K26/064B23K26/60B23K26/0876
Inventor 雷正龙刘景涛陈源黎炳蔚王学峰
Owner HARBIN INST OF TECH
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