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Method for eliminating laser welding pores of aluminum-lithium alloy T-shaped joint

A laser welding, aluminum-lithium alloy technology, applied in laser welding equipment, welding equipment, metal processing equipment and other directions, can solve problems such as easy occurrence of pores, achieve the effect of improving the effect of high swing frequency, and improve the effect of welding seam forming

Active Publication Date: 2021-03-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention aims to solve the problem that air holes are prone to appear during the laser welding process of aluminum-lithium alloy T-shaped joints

Method used

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  • Method for eliminating laser welding pores of aluminum-lithium alloy T-shaped joint
  • Method for eliminating laser welding pores of aluminum-lithium alloy T-shaped joint
  • Method for eliminating laser welding pores of aluminum-lithium alloy T-shaped joint

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0041] Example 1: The steps of static dual-beam laser welding include:

[0042] Step 1: After the aluminum-lithium alloy workpiece to be welded is subjected to mechanical grinding, anhydrous ethanol cleaning and drying in sequence, the surface of the workpiece to be welded is smooth and oil-free. Fix the workpiece to be welded with the surface oxide film removed on the fixture, wherein the rib plate 6 is in a vertical state and is located above the bottom plate 7 in a horizontal state, and the two form an inverted "T" structure, such as figure 1 shown.

[0043] Step 2: Apply dual laser beams on the left and right sides of the T-joint to be welded. The selected laser is CO 2 Gas laser, where the laser welding head is on the XZ plane, the angle between the positive direction of the Z axis is 45°, the power of laser beam 1 and laser beam 2 are both 2000W, the defocus of the beam is 2mm, and the diameter of the laser spot is 0.3mm .

[0044] Step 3: Set parameters: the welding ...

example 2

[0047] The specific operation of this example is as follows:

[0048] Step 1: After the aluminum-lithium alloy workpiece to be welded is subjected to mechanical grinding, anhydrous ethanol cleaning and drying in sequence, the surface of the workpiece to be welded is smooth and oil-free. Fix the workpiece to be welded with the surface oxide film removed on the fixture, wherein the rib plate 6 is in a vertical state and is located above the bottom plate 7 in a horizontal state, and the two form an inverted "T" structure, such as figure 1 shown.

[0049] Step 2: Apply dual laser beams on the left and right sides of the T-joint to be welded. The selected laser is CO 2 Gas laser, where the laser welding head is on the XZ plane, the angle between the positive direction of the Z axis is 45°, the power of laser beam 1 and laser beam 2 are both 2000W, the defocus of the beam is 2mm, and the diameter of the laser spot is 0.3mm .

[0050] Step 3: Set parameters: the welding speed is 3...

example 3

[0053] The specific operation of this example is as follows:

[0054] Step 1: After the aluminum-lithium alloy workpiece to be welded is subjected to mechanical grinding, anhydrous ethanol cleaning and drying in sequence, the surface of the workpiece to be welded is smooth and oil-free. Fix the workpiece to be welded with the surface oxide film removed on the fixture, wherein the rib plate 6 is in a vertical state and is located above the bottom plate 7 in a horizontal state, and the two form an inverted "T" structure, such as figure 1 shown.

[0055] Step 2: Apply dual laser beams on the left and right sides of the T-joint to be welded. The selected laser is CO 2 Gas laser, where the laser welding head is on the XZ plane, the angle between the positive direction of the Z axis is 45°, the power of laser beam 1 and laser beam 2 are both 2000W, the defocus of the beam is 2mm, and the diameter of the laser spot is 0.3mm .

[0056] Step 3: Set parameters: the welding speed is 3...

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Abstract

The invention discloses a method for eliminating laser welding pores of an aluminum-lithium alloy T-shaped joint, and relates to the field of material processing engineering. The method aims at solving the problem that pores are prone to occurring in the laser welding process of the aluminum-lithium alloy T-shaped joint. According to the method, a double-beam rotary laser welding head is adopted to realize the rotary motion of double light beams through an internal lens module, and the rotary motion can comprise the rotary motion of the double light beams around a self-axis and the rotary motion of the double light beams around a revolution axis; the rotating double light beams enable a keyhole to be more stable to a certain extent, and the keyhole is relatively not prone to being closed;meanwhile, the collapse of a keyhole wall is avoided due to the rotation effect of the double light beams, so that the formation of process pores is reduced; active regulation and control of molten drop transition can be realized through high-frequency rotation of two beams of laser during double-beam rotary laser welding; and meanwhile, the rotating laser beam can refine grains, so that the mechanical property of the aluminum-lithium alloy T-shaped joint is improved. The method is applied to the field of welding.

Description

technical field [0001] The invention relates to the field of welding, in particular to a method for eliminating pores in laser welding of aluminum-lithium alloy T-shaped joints. Background technique [0002] Lightweight aircraft is the inevitable direction of the development of modern aviation manufacturing industry. Today, conventional aluminum alloys can no longer meet the urgent needs of today's aviation industry in terms of lightweight, and new aluminum-lithium alloys have become the first choice for key structural materials of large passenger aircraft due to their low density, high specific strength and corrosion resistance. Studies have shown that aluminum-lithium alloys are used in aircraft structural materials, which reduce the mass by 10% to 20% compared with conventional aluminum alloys, increase the stiffness by 15% to 20%, and the cost of aluminum-lithium alloys is much smaller than that of advanced composite materials. With the successful development of more an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/21B23K26/14B23K26/16B23K26/70
CPCB23K26/21B23K26/14B23K26/16B23K26/702
Inventor 雷正龙付伟杰张新瑞夏佩云胡蓝尹玉环黎炳蔚陈彦宾
Owner HARBIN INST OF TECH
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