5A06/ZL114A dissimilar aluminum alloy part butt joint laser swing welding method

Abstract

The invention provides a 5A06 / ZL114A dissimilar aluminum alloy part butt joint laser swing welding method, and belongs to the technical field of welding. The method comprises the following steps thata 5A06 aluminum alloy part and a ZL114A aluminum alloy part are placed in a butt joint mode to form a structure to be welded, wherein the welding depth of the structure to be welded is 3-5 mm; the structure to be welded is welded through adopting a laser swing welding process to obtain an initial welding part; during welding, an incident angle of a laser beam is 90 degrees, the laser power is 4500-5000W, the welding speed is 1500-1800 mm / min, the light spot diameter is 0.2-0.3 mm, the defocusing amount is -1-1 mm, the swing frequency is 100-300 Hz, and the swing amplitude is 1-3 mm; laser swing welding is carried out on the initial welding part again to obtain a final product; and during welding, the incident angle of the laser beam is 80-85 degrees, the laser power is 1000-2000W, the welding speed is 2000-2200 mm / min, the light spot diameter is 0.1-0.2 mm, the defocusing amount is 3-6 mm, the swing frequency is 200-300 Hz, and the swing amplitude is 2.5-3 mm. A weld joint obtained bythe method has no undercut, no pits, no salient points, and no air holes at the surface or the near surface, the internal quality meets the GB / T 22085.2-2008 standard strict B-level requirement, and no internal cracks or no air holes exist.

Description

technical field [0001] The invention relates to the field of welding technology, and in particular provides a laser swing welding method for the butt joint of 5A06 / ZL114A dissimilar aluminum alloy thin-walled parts. Background technique [0002] With the application and development of aerospace technology, the application of aluminum alloys in this field is becoming more and more extensive. Aluminum alloy materials can effectively reduce product weight and improve product performance. Laser welding energy is highly concentrated, which can significantly increase welding speed and achieve high-precision, low-distortion welding characteristics. Aluminum alloy laser welding can greatly increase the processing speed and reduce post-weld deformation, which has obvious advantages compared with traditional joining methods. However, the stability of the welding process of aluminum alloy laser welding is poor, and the plasma fluctuation is large, which is easy to form forming defect...

AI Technical Summary

Problems solved by technology

[0004] Due to the difference in physical and chemical properties between the 5A06 aluminum alloy and the ZL114A aluminum alloy, when the welding depth of the 5A06 aluminum alloy and the ZL114A aluminum alloy is 3 to 5 mm, there is still undercut, Pit and Porosity Weld Defects

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