A method for eliminating air holes in laser welding of Al-Li alloy T-joints

A laser welding, aluminum-lithium alloy technology, applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve problems such as easy occurrence of pores, and achieve the effect of eliminating pores, promoting bubble escape, and reducing evaporation

Active Publication Date: 2022-06-28
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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  • A method for eliminating air holes in laser welding of Al-Li alloy T-joints
  • A method for eliminating air holes in laser welding of Al-Li alloy T-joints
  • A method for eliminating air holes in laser welding of Al-Li alloy T-joints

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 free of oil stains. The workpiece to be welded whose surface oxide film has been removed is fixed 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" type structure, such as figure 1 shown.

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

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 free of oil stains. The workpiece to be welded whose surface oxide film has been removed is fixed 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" type structure, such as figure 1 shown.

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

[0050]...

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 free of oil stains. The workpiece to be welded whose surface oxide film has been removed is fixed 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" type structure, such as figure 1 shown.

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

[0056]...

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Abstract

The invention discloses a method for eliminating air holes in laser welding of an aluminum-lithium alloy T-joint, which relates to the field of material processing engineering. The invention aims to solve the problem that air holes are prone to occur during the laser welding process of the aluminum-lithium alloy T-shaped joint. The present invention uses a dual-beam rotating laser welding head to realize the rotational motion of the dual-beam through the internal lens module, and the rotational motion may include the rotational motion of the dual-beam around its own axis and the rotational motion around the common axis. The rotating double beam makes the keyhole more stable to a certain extent, and it is relatively difficult to close. At the same time, the rotation of the double beam avoids the collapse of the keyhole wall, thereby reducing the formation of process pores. Dual-beam rotating laser welding can realize the active control of droplet transfer through the high-frequency rotation of two laser beams; at the same time, the rotating laser beam can refine the grains, thereby improving the mechanical properties of the Al-Li alloy T-joint. The invention is applied in 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 an aluminum-lithium alloy T-joint. Background technique [0002] Aircraft lightweight is an inevitable direction for the development of modern aviation manufacturing. 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 for large passenger aircraft due to their low density, high specific strength and corrosion resistance. Studies have shown that when aluminum-lithium alloys are used in aircraft structural materials, the mass of aluminum-lithium alloys is reduced by 10% to 20% and the stiffness is increased by 15% to 20% compared with conventional aluminum alloys. The cost of aluminum-lithium alloys is much lower than that of advanced composite materials. With the successful deve...

Claims

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Application Information

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Patent Type & Authority Patents(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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