Coarse-grained aluminum alloy welded joint grain refinement control method

CN123025035APending Publication Date: 2026-11-03JIANGXI CITIC AVIATION EQUIP MFG CO LTD
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Patent Information

Application Number
CN202611188419.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-08-06
Publication Date
2026-11-03

AI Technical Summary

Technical Problem

Existing technologies cannot effectively perceive the coupling relationship between the internal temperature field of the molten pool and the dissolution kinetics of the precipitated phase during the welding process of aluminum-lithium alloys. This results in the inability to break the nascent zirconium-containing precipitates into submicron-sized particles before they are completely dissolved, and thus cannot suppress the abnormal grain growth in the heat-affected zone of the weld joint.

Method used

By arranging pulsed electromagnetic induction coils on both sides of the weld, the temperature data of the molten pool is collected in real time and input into the coupling matching model to calculate the critical dissolution size of the primary Al3Zr phase. The pulsed current of the corresponding frequency is output to generate controlled Lorentz force. The high-frequency electromagnetic force is used to shear and break the undissolved submicron Al3Zr particles and promote their dispersion at the solidification front.

Benefits of technology

This method achieves refined control of grain size in aluminum-lithium alloy welded joints, eliminates the coarse grain zone in the heat-affected zone of the joint, improves the uniformity of grain distribution in the melt, and suppresses the transformation of columnar crystals to equiaxed crystals.

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Abstract

The present application relates to the technical field of new aviation aluminum alloy material, and particularly relates to a grain refinement control method for a coarse-grained aluminum alloy welded joint. In the welding process, the molten pool temperature data is collected in real time and input into a coupling matching model to calculate the critical dissolution size of the primary zirconium-containing precipitated phase in the aluminum-lithium alloy matrix. According to the size, a pulse current with a corresponding frequency is output to the inductive coil on both sides of the weld to generate a controlled Lorentz force. At the critical moment before the primary zirconium-containing precipitated phase is completely dissolved, the frequency of the pulse current is jumped to a high-frequency state, the undissolved submicron zirconium-containing precipitated phase particles are sheared and broken by the high-frequency electromagnetic force, and the particles are dispersedly distributed at the solidification front. The method increases the heterogeneous nucleation density of the solidification front, suppresses the abnormal grain growth, and eliminates the coarse-grained zone in the joint heat-affected zone.
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