Laser welding method applicable to aluminum alloy

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-...

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