Laser welding method for copper-aluminum dissimilar metals

A laser welding, dissimilar metal technology, applied in laser welding equipment, welding equipment, metal processing equipment and other directions, can solve the problems of brittle phase intermetallic compounds, easy to appear pores, difficult to weld, etc., to reduce brittle phase intermetallic compounds The production of aluminum, avoid the excessive melting of aluminum, improve the effect of welding quality

Inactive Publication Date: 2020-03-27
GUANGDONG OCEAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reflectivity of commonly used industrial lasers (such as wavelength 1.06-10.6 microns) is very high, it is difficult to weld, and welding is prone to problems such as pores, thermal cracks, and brittle phase intermetallic compounds.

Method used

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  • Laser welding method for copper-aluminum dissimilar metals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] T2 copper plate is selected as the welding workpiece, the machining specification is 1*1*1mm, and the machining specification of 1060 aluminum plate is 1*1*1mm;

[0047] Pre-treat the welding area of ​​the workpiece to be welded, clean up dust, oil or rust, and dry to obtain a clean and dry welding surface;

[0048] Place the copper plate and the aluminum plate on the welding platform, and fix them with clamps so that the areas to be welded of the copper plate and the aluminum plate are in contact as much as possible;

[0049] The mass ratio of 1g of cerium oxide to yttrium oxide is 1:1 mixed powder evenly paved on the area to be welded of the copper plate and the aluminum plate;

[0050] Adjust the 90° between the laser and the surface of the workpiece, and perform laser welding. Welding process parameters: current is 260A, pulse width is 3.5ms, frequency is 60Hz, maximum power is 800W, laser wavelength is 1064nm, and welding speed is 5mm / s.

[0051] Welding under thi...

Embodiment 2

[0053] T2 copper plate is selected as the welding workpiece, the machining specification is 1*1*1mm, and the machining specification of 1060 aluminum plate is 1*1*1mm;

[0054] Pre-treat the welding area of ​​the workpiece to be welded, clean up dust, oil or rust, and dry to obtain a clean and dry welding surface;

[0055] Place the copper plate and the aluminum plate on the welding platform, and fix them with clamps so that the areas to be welded of the copper plate and the aluminum plate are in contact as much as possible;

[0056] Evenly spread 0.5g of cerium oxide and yttrium oxide mixed powder in the area to be welded on the copper plate and the aluminum plate with a mass ratio of 1:3;

[0057] Adjust the 90° between the laser and the surface of the workpiece, and perform laser welding. Welding process parameters: current is 260A, pulse width is 3.5ms, frequency is 60Hz, maximum power is 800W, laser wavelength is 1064nm, and welding speed is 5mm / s.

[0058] Welding under...

Embodiment 3

[0060] T2 copper plate is selected as the welding workpiece, the machining specification is 10*1*1mm, and the machining specification of 1060 aluminum plate is 10*1*1mm;

[0061] Pre-treat the welding area of ​​the workpiece to be welded, clean up dust, oil or rust, and dry to obtain a clean and dry welding surface;

[0062] Place the copper plate and the aluminum plate on the welding platform, and fix them with clamps so that the areas to be welded of the copper plate and the aluminum plate are in contact as much as possible;

[0063] The mixed powder that the mass ratio of 15g cerium oxide and yttrium oxide is 1:2 is evenly paved on the region to be welded of copper plate and aluminum plate;

[0064] Adjust the 90° between the laser and the surface of the workpiece, and perform laser welding. Welding process parameters: current is 260A, pulse width is 3.5ms, frequency is 60Hz, maximum power is 800W, laser wavelength is 1064nm, and welding speed is 5mm / s.

[0065] Welding un...

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Abstract

The invention discloses a laser welding method for copper-aluminum dissimilar metals, and belongs to the technical field of laser welding. According to the laser welding method, mixed powder is laid at a joint of workpieces subjected to pretreatment; laser welding is carried out on the workpiece laid with the mixed powder; and the mixed powder is a mixture of cerium oxide and yttrium oxide. According to the method, a certain proportion of the mixed powder of cerium oxide and yttrium oxide is laid at the joint of the butt-welded copper-aluminum dissimilar metal, so that the blackening treatmentat the joint is realized, and the effect of reducing the laser reflectivity and improving the absorptivity is achieved. Meanwhile, the absorption of the laser energy by the copper aluminum is balanced, and the phenomenon that a copper material is not sufficiently melted and an aluminum material is over melted is avoided. On the other hand, the addition of the mixed powder of cerium oxide and yttrium oxide can effectively refine the microstructure of the joint, reduce the generation of a brittle phase intermetallic compound, and improve the welding quality of a weld joint.

Description

technical field [0001] The invention relates to the technical field of laser welding, in particular to a laser welding method for copper-aluminum dissimilar metals. Background technique [0002] Copper and aluminum are the more common metals among many metal materials. Because copper has excellent electrical conductivity, small thermal expansion coefficient, and stable physical properties, it has been widely used in the electronic power industry. On the other hand, the superior physical properties of copper lead to a huge demand in the industry. With the consumption of copper, its cost increases year by year. At present, copper prices remain high, which makes the production cost of the electronic power industry also rise all the way. However, because aluminum is more abundant on earth, it is easy to extract and the mining cost is relatively low. [0003] Although the electrical conductivity, thermal conductivity, thermal expansion coefficient and other physical properties...

Claims

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Application Information

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IPC IPC(8): B23K26/211B23K26/70
CPCB23K26/211B23K26/70
Inventor 黄江师文庆李思东安芬菊谢玉萍
Owner GUANGDONG OCEAN UNIVERSITY
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