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Laser tig hybrid welding process for improving undercutting of titanium and titanium alloy thin plates

A welding process, titanium alloy technology, applied in the field of laser TIG hybrid welding welding process, can solve the problems of slow welding speed, low welding efficiency, limited effect, etc., to solve the problem of undercut, ensure welding quality, and improve the effect of welding methods

Active Publication Date: 2020-11-10
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the welding speed is slow, and the method of cold filling wire is adopted, which increases the cost
[0006] The above two methods have their own advantages and disadvantages, but generally speaking, the welding efficiency is low, and the effect of improving undercut defects is limited

Method used

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  • Laser tig hybrid welding process for improving undercutting of titanium and titanium alloy thin plates
  • Laser tig hybrid welding process for improving undercutting of titanium and titanium alloy thin plates
  • Laser tig hybrid welding process for improving undercutting of titanium and titanium alloy thin plates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The following takes the welding of a 0.9mm thick pure titanium TA2 thin plate as an example to describe in detail.

[0029] According to the above process flow, the laser TIG hybrid welding process is adopted, the equipment is IPG YLS-10000 multi-mode fiber laser and KUKA KRC2 welding robot, the welding power source is Xinwei MPT-500D, the diameter of the tungsten rod is 3.2mm, and the purity of the shielding gas is 99.9%. Argon gas, the gas flow rate is 18L / min.

[0030] 1. Preparation before welding

[0031] Adjust the welding torch angle and electrode spacing according to actual welding needs; in this example, the inclination angle of laser head 1 is θ=5°, the inclination angle of TIG welding torch 2 is β=45°, and the distance between heat sources is D=5mm.

[0032] 2. Debug welding parameters

[0033] Set the laser parameters, the laser power is 2200W, the defocus is 25mm, the vertical distance between the laser head 1 and the workpiece 3 is 310mm, the welding spe...

Embodiment 2

[0046] Compared with Example 1, most of them are the same, except that in this example, the welding process parameters are controlled as:

[0047] The argon gas flow rate of TIG torch 1 is 15 L / min, and the argon gas flow rate of the back protection is 15 L / min. The welding current is 67.5A, the distance between the tip of the electrode and the workpiece 3 is about 2-3mm; the laser power is 1400W, the defocus is 25mm, the vertical distance between the laser head 1 and the workpiece 3 is 310mm, the welding speed is 4.8m / min, and the distance between the heat sources is D = 1 mm, the inclination angle θ of the laser head 1 = 5°, and the inclination angle β of the TIG welding torch 2 = 45°.

Embodiment 3

[0049] Compared with Example 1, most of them are the same, except that in this example, the welding process parameters are controlled as:

[0050] The argon gas flow of TIG welding torch 1 is 18L / min, and the argon gas flow of back protection is 18L / min. The welding current is 65A, the distance between the tip of the electrode and the workpiece 3 is about 2-3mm; the laser power is 1800W, the defocus is 25mm, the vertical distance between the laser head 1 and the workpiece 3 is 310mm, the welding speed is 6m / min, and the heat source distance is D= 9mm, the inclination angle θ of the laser head 1 = 5°, and the inclination angle β of the TIG welding torch 2 = 45°.

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Abstract

The invention relates to a laser TIG hybrid welding process for solving the undercut problem of titanium and titanium alloy thin plate laser welding. According to the laser TIG hybrid welding process,in the welding direction, a welding gun located ahead is a superhigh frequency impulse TIG welding gun, and a welding gun located behind is a laser head; the distance between the two welding guns is1-9 mm; and co-molten-bath welding is achieved. Compared with the prior art, according to the laser TIG hybrid welding process, electromagnetic stirring of TIG high-frequency impulse compressive arcsis utilized to improve flowability of a molten bath is improved; the cooling time of a welding seam is prolonged; the undercut problem generated by high-speed welding or under certain laser power canbe fully inhibited; the welding seam is formed well; the welding speed can reach 6 m / min; and in addition, a joint is excellent in quality.

Description

technical field [0001] The invention belongs to the technical field of metal welding, and relates to a laser TIG hybrid welding process for improving the undercut of titanium and titanium alloy thin plates by laser welding. Background technique [0002] Titanium and titanium alloys are widely used in automotive, biomedical, aerospace, petrochemical, marine engineering and other fields due to their high specific strength, low density and good corrosion resistance. Laser welding has the characteristics of concentrated energy density, small heat-affected zone, and high degree of automation. It is suitable for welding titanium and titanium alloy thin plates. However, under high-speed welding conditions or a specific laser power, due to the high welding speed, small heat input and fast cooling speed, the liquid metal has solidified before it can fill both sides of the weld, and the weld will be severely bitten. side issue. [0003] Laser TIG hybrid welding can effectively incre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/348
CPCB23K26/348
Inventor 李芳周洋孔谅李兴宇王敏华学明
Owner SHANGHAI JIAO TONG UNIV
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