Laser welding method applicable to aluminum alloy

A technology of laser welding and aluminum alloy, which is applied in the direction of laser welding equipment, welding equipment, welding/welding/cutting items, etc., can solve problems such as welding thermal cracks, weld pores, joint softening, etc., and achieve high strength and good welds organization effect

Inactive Publication Date: 2014-09-10
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, as a fusion welding method, laser welding of aluminum alloys inevitably has problems such as weld pores, welding thermal cracks and joint softening that are often encountered in general fusion welding.

Method used

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  • Laser welding method applicable to aluminum alloy

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Effect test

Embodiment 1

[0014] 7021 aluminum alloy (Al-5.5Zn-1.4Mg aluminum alloy) (should be Zn of 5.5% by weight, Mg of 1.4% by weight, and the rest is Al) adopts the laser welding method of the present invention, and the specific process is that the laser power is 2200w, The welding speed is 1m / min, the defocus is 0, the shielding gas is high-purity argon, and the shielding gas flow rate is 16L / min. The results show that if figure 1 As shown, after the alloy is laser welded, the weld structure is uniform, without welding pores, structure boundaries and obvious coarse-grained bands.

Embodiment 2

[0016] To 7029 aluminum alloy (Al-4.6Zn-1.6Mg-0.7Cu aluminum alloy) (should be Zn of 4.6% by weight, Mg of 1.6% by weight, Cu of 0.7% by weight, the rest is Al) adopt the electron beam welding of the present invention The method, the specific process is that the laser power is 2000w, the welding speed is 1.1m / min, the defocus is 0.25, the shielding gas is high-purity argon, and the shielding gas flow rate is 15L / min. The results show that the Al-Zn-Mg-Cu alloy welded joint has a high tensile strength, which can reach 340MPa, which is about 82% of the base metal.

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Abstract

The invention discloses a laser welding method applicable to aluminum alloy. The method includes that technological parameters are used for the aluminum alloy, which include that the laser power is 2000-2400w, the welding speed is 0.8-1.2m/min, the off-focus value is (minus 0.5)-0.5 and the protective gas flow speed is 12-18L/min, and good weld joints are obtained. The aluminum alloy is 7000 series aluminum alloy, especially, 7000 series aluminum alloy for automobiles. The laser welding method applicable to the aluminum alloy has the advantages that the aluminum alloy, especially, the 7000 series aluminum alloy for the automobiles, which are processed by the method, can gain good weld joint structures, and weld porosity, structure boundaries and obvious coarse-grain zones are absent. The strength of a weld assembly is high.

Description

technical field [0001] The invention relates to a laser welding method suitable for aluminum alloys, in particular to a laser welding method suitable for 7000 series aluminum alloys used in automobiles. Background technique [0002] As a widely used structural material, aluminum alloy should not only have high specific strength, specific modulus, fracture toughness, fatigue strength and corrosion resistance stability, but also have good forming process and good weldability. The 7000 series aluminum alloy is an aluminum alloy with Zn and Mg as the main alloying elements, and belongs to the aluminum alloy that can be strengthened by heat treatment. Al-Zn-Mg alloy, the alloy has good thermal deformation performance, wide quenching range, high strength can be obtained under appropriate heat treatment conditions, good welding performance, generally good corrosion resistance, and has a certain tendency of stress corrosion. It is a high-strength weldable aluminum alloy. Al-Zn-Mg-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/24B23K103/10
CPCB23K26/24B23K2103/10
Inventor 王锋熊柏青张永安刘红伟李志辉李锡武
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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