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Dual ultrasonic assisted laser-cmt hybrid welding system and welding method

An ultrasonic-assisted, hybrid welding technology, applied in laser welding equipment, welding/welding/cutting items, welding equipment, etc., can solve the problems of large loss of reinforcement phase, affecting weld quality, reducing joint performance, etc., to achieve molten pool adhesion Effects of improved hysteresis, simple welding process, and reduced number of defects

Active Publication Date: 2021-11-23
CHINA SHIP SCIENTIFIC RESEARCH CENTER (THE 702 INSTITUTE OF CHINA SHIPBUILDING INDUSTRY CORPORATION)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) The heat input of fusion welding is large, the loss of reinforcement phase is large, and it is difficult to obtain high-quality welded joints
[0007] (2) The fluidity of the molten pool of aluminum-based composite materials is poor, and the wettability between the reinforced phase particles with a high melting point and the Al collective is poor. The molten pool is prone to stickiness and inclusions, which affect the quality of the weld.
[0008] (3) A large amount of Al4C3 intermetallic compounds are formed in the weld metal, which increases the brittleness of the weld and reduces the performance of the joint
[0009] (4) There is a significant difference in physical properties between the reinforcing phase and the matrix. Under the fast cooling rate of fusion welding, it is easy to form voids and pore defects, reducing the performance of the joint

Method used

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  • Dual ultrasonic assisted laser-cmt hybrid welding system and welding method
  • Dual ultrasonic assisted laser-cmt hybrid welding system and welding method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The specific steps are:

[0051] Pre-welding treatment steps for aluminum-based composite materials: Before welding, open a single-side 30°V-shaped groove, leave a 0.5mm blunt edge, polish the groove and its vicinity with sandpaper to remove scale, and use acetone to ultrasonically clean it for 10 minutes;

[0052] Parameter setting: the workpiece 10 is a SiC reinforced aluminum matrix composite material with a volume fraction of 17%, the size is 160*80*4mm, and it is placed on the workbench 14. The running speed of the workbench 14 is set to 1m / min, and the fiber laser 4 adopts a continuous laser. The laser power and defocus are 1000W and 15mm respectively, the welding current of CMT welding machine 3 is set to 80A; use the upper ultrasonic mechanism 1, and adjust the distance d1 and θ to 10mm and 20° respectively, the ultrasonic power is 800W, and the ultrasonic cylinder The pressure is 0.25MPa;

[0053] The workpiece 10 is fixed with a special fixture, leaving a gap...

Embodiment 2

[0056] The specific steps are:

[0057] Pre-welding treatment steps for aluminum-based composite materials: Before welding, open a single-side 30°V-shaped groove, leave a 0.5mm blunt edge, polish the groove and its vicinity with sandpaper to remove scale, and use acetone to ultrasonically clean it for 10 minutes;

[0058] Parameter setting: the SiC reinforced aluminum matrix composite material with a volume fraction of 20% has a size of 160*80*6 mm and is placed on the workbench 14. The running speed of the workbench is set to 1m / min. The focal weight is 1000W and 15mm respectively, the welding current of CMT welding machine 3 is set to 100A; the lower ultrasonic mechanism 6 is adopted, and the distance d2 and θ are adjusted to 10mm and 0° respectively, the ultrasonic power is 800W, and the ultrasonic cylinder pressure is 0.3MPa ;

[0059] The workpiece 10 is fixed with a special fixture, so that there is a 1mm gap in the groove, and the shielding gas is 99.999% pure Ar. Befo...

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Abstract

The invention relates to a dual-ultrasonic assisted laser-CMT composite welding system and a welding method. The system is composed of three parts: a workbench, an ultrasonic mechanical vibration mechanism and a laser-CMT composite welding; Including upper and lower ultrasonics, and the upper ultrasonic is equipped with adjustable angle waist holes to facilitate the application of ultrasonics at different angles; laser-CMT hybrid welding realizes welding with low heat input and low welding deformation; aluminum-based composite materials are welded by grinding, cleaning, etc. Before cleaning, clamp it on the workbench, and use self-made flux-cored welding wire as the welding wire. By adjusting the ultrasonic position and angle (distance d 1 、d 2 and θ), the present invention satisfies the low-stress and low-heat-input welding of aluminum-based composite materials, the fluidity of the molten pool is improved, the tensile strength of the welded joint reaches more than 70% of the base metal, the number of pores in the joint is significantly reduced, and the weld metal Medium brittle intermetallic compound Al 4 C 3 The number is reduced and distributed in a diffuse manner, and the product TiC acts as a reinforcing phase.

Description

technical field [0001] The invention relates to the welding field of aluminum-based composite materials, in particular to a dual-ultrasonic-assisted laser-CMT composite welding system and a welding method. Background technique [0002] Aluminum matrix composites have the advantages of low density, high specific strength / specific stiffness, high shear strength, low thermal expansion coefficient, high temperature resistance, wear resistance and wear resistance, etc., and have many applications in ships, aerospace and other fields, but The fusion welding of aluminum matrix composites is difficult. When the aluminum alloy matrix is ​​heated above the melting point, the reinforcing phase such as silicon carbide is still solid, which easily leads to high viscosity of the molten pool, poor fluidity, and poor weld formation. The number of welded joint defects increases, the joint strength is low, the reinforcement phase is easy to burn, and brittle intermetallic compounds, pores and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K28/02B23K26/21B23K20/10
CPCB23K20/10B23K28/02B23K26/21B23K2103/10
Inventor 韦朋余李生鹏张亦龙张若楠王连
Owner CHINA SHIP SCIENTIFIC RESEARCH CENTER (THE 702 INSTITUTE OF CHINA SHIPBUILDING INDUSTRY CORPORATION)
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