Double-beam swing welding method for inhibiting high-strength titanium alloy welding cracks

A welding crack and welding method technology is applied in the field of dual-beam laser swing welding for suppressing welding cracks in high-strength titanium alloys. Effects of small joint stress and deformation

Active Publication Date: 2020-09-18
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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  • Double-beam swing welding method for inhibiting high-strength titanium alloy welding cracks
  • Double-beam swing welding method for inhibiting high-strength titanium alloy welding cracks
  • Double-beam swing welding method for inhibiting high-strength titanium alloy welding cracks

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Experimental program
Comparison scheme
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

The invention discloses a double-beam swing welding method for inhibiting high-strength titanium alloy welding cracks and relates to the field of material machining engineering. The method aims at solving the problems of welding cracks and air hole defects of high-strength titanium alloys, especially the problem that an existing swing laser welding method cannot be used for solving the problems ofwelding cracks and air hole defects of high-strength titanium alloys. By means of the method, a light path is designed for achieving double-beam laser welding, one beam is fixed, the other beam swings to serve as the auxiliary part, and a track and energy distribution synchronous optimization manner is used for inhibiting the above welding defects. Compared with common swing laser welding, the method can better conform to the flowing trend of a molten pool, convection of the molten pool is better enhanced, and air hole and cracking defects are reduced; the swing amplitude is larger, the temperature gradient is reduced, melt supplementation is driven at the solidification front of the tail portion of the molten pool, and solidification cracks are prevented; and light beam energy distribution and swing tracks are combined, temperature field distribution is improved, connector stress and deformation are reduced, and crack initiation is inhibited. The method is applied to the field of material machining.

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 Applications(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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