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A kind of al-mg-sc series welding wire for aluminum alloy laser welding

A technology of laser welding and aluminum alloy, applied in laser welding equipment, welding medium, welding equipment and other directions, can solve the problems of designing welding wire, etc., and achieve the effect of improving tensile strength, yield strength, tensile strength and yield strength

Inactive Publication Date: 2018-03-16
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no welding wire specially designed for the characteristics of laser welding at home and abroad.

Method used

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  • A kind of al-mg-sc series welding wire for aluminum alloy laser welding
  • A kind of al-mg-sc series welding wire for aluminum alloy laser welding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] On the basis of the Al-Mg series welding wire composition of grade 5087, the welding wire was prepared by adding Sc element. The content of Sc element is 2.9wt.%. The 2060-T8 alloy is butt welded with a fiber laser, the laser model is IPG YLS-6000, the laser power is 3kW, the welding speed is 2m / min, the wire feeding speed is 3m / min, and the welding pool is protected by Ar gas. The tensile property test was carried out on the joint, and the yield strength of the joint using the welding wire of the present invention was 322MPa, and the tensile strength was 394MPa. The yield strength of the joint using 5087 welding wire is 235MPa, and the tensile strength is 317MPa.

Embodiment 2

[0027] The welded joints obtained by using the 5087 welding wire without Sc in Example 1 and the Al-Mg-Sc welding wire with high Sc content of the present invention were used to observe the metallographic microstructure of the weld. figure 1 It is the metallographic microstructure of the weld filled with 5087 welding wire. figure 2 It is the metallographic microstructure of the welding seam filled with the Al-Mg-Sc welding wire with high Sc content of the present invention. Comparing the two figures, it can be seen that the weld structure using 5087 welding wire is mainly composed of thick dendrites, forming columnar crystals with strong direction near the edge of the weld; and the weld structure filled with the Al-Mg-Sc welding wire with high Sc content of the present invention Intense refinement occurs, the weld is entirely composed of fine equiaxed grains, and the columnar grains disappear.

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Abstract

The invention relates to an Al-Mg-Sc welding wire for aluminum alloy laser welding. The Al-Mg-Sc welding wire for aluminum alloy laser welding comprises 3.8%-5.8% of Mg, 1.5%-3.8% of Sc, 0.4%-1.2% of Mn, 0.05%-0.2% of Zr, 0.08%-0.25% of Cr, and the balance Al and other inevitable impurity elements such as Si, Fe, Zn, Ti and Cu. The Al-Mg-Sc welding wire for aluminum alloy laser welding has the advantages that the crystal structure of a weld joint can be refined remarkably, generation of heat welding cracks is restrained, and the tensile strength and the yield strength of a joint are improved.

Description

technical field [0001] The invention relates to a novel aluminum alloy welding wire, which is especially suitable for laser welding of aluminum alloy. Background technique [0002] Aluminum alloy has the characteristics of low density, high specific strength, good corrosion resistance and machinability, and has been widely used. [0003] Laser welding energy is highly concentrated, welding speed is fast, heat input is small, welding heat-affected zone is narrow, and welding structure deformation is small. It has been developed rapidly in recent years and is considered to be one of the methods with the most technical and economic advantages for aluminum alloy structural connections. [0004] Aluminum alloy is a typical eutectic alloy with a large coefficient of thermal expansion, and it is prone to solidification cracks during fusion welding. Therefore, high-Si, high-Mg or high-Cu welding wires are generally used for welding aluminum alloys, and traces of Ti, Zr and other de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/28B23K26/21
CPCB23K26/20B23K35/288
Inventor 肖荣诗张心怡杨武雄
Owner BEIJING UNIV OF TECH