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Welding wire for high-strength aluminum-zinc-magnesium-scandium alloy and preparation method thereof

An aluminum-zinc-magnesium and welding wire technology, which is applied in the field of material science and engineering, can solve the problem that the alloy engineering application is affected, and the alloy cannot provide good welding matching, crack resistance, and stress corrosion resistance. The comprehensive mechanical properties of the joint cannot exert high-strength aluminum The strength advantages of zinc-magnesium-scandium alloys and other issues can improve the welding performance, improve the tensile strength and comprehensive mechanical properties, and improve the strength.

Active Publication Date: 2015-12-23
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Application Information

AI Technical Summary

Problems solved by technology

High-strength aluminum-zinc-magnesium-scandium alloys can be welded with aluminum-magnesium welding wires such as ER5356, ER5556, and 5B06, and aluminum-magnesium-scandium welding wires. Although joints of a certain quality can be obtained by welding such welding wires, the crack resistance, stress corrosion resistance, especially joints In terms of comprehensive mechanical properties, the strength advantages of high-strength aluminum-zinc-magnesium-scandium alloys cannot be exerted
[0004] Due to the high comprehensive performance of high-strength aluminum-zinc-magnesium-scandium alloys, the requirements for welding quality are also increased simultaneously, especially for the mechanical properties of joints. Performance advantages, unable to provide good welding matching for the alloy, affecting the engineering application of the alloy, so the development of high-performance matching welding wire is very urgent

Method used

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preparation example Construction

[0043] The preparation method of the high-strength aluminum-zinc-magnesium-scandium alloy welding wire of the present invention specifically comprises the following steps:

[0044] (1) Alloy smelting: using a melting furnace, such as a power frequency induction furnace, adding pure aluminum, Al-50Zn, Al-10Mn, Al-30Cu, Al-2Sc, Al-10Zr, Al-10Cr, Al in sequence during melting -10Ce or Al-10Y, Al-5Ti and other aluminum-based intermediate alloys, after all the metals in the melting furnace are melted, the metal Mg covered with aluminum foil is pressed into the melting furnace with a graphite funnel, and the melting temperature is 760-790 ° C. The time is 10-20min, so that the intermediate alloy phase with relatively high temperature is fully melted.

[0045] Then carry out refining, the refining agent is hexachloroethane, wrap the refining agent with aluminum foil and press it into the melting furnace with a graphite funnel, stir up and down for 2-3 minutes, then remove the scum on...

Embodiment 1

[0054] (1), composition and proportion (mass percentage):

[0055] Zn5.0, Mg3.5, Zr0.14Sc0.21, Mn0.25, Ti0.08, Cr0.15, Cu0.5, Y0.05, and the balance is Al.

[0056] (2), preparation process:

[0057] Pure aluminum (aluminum content ≥ 99.9%) and magnesium (Mg) are added in the form of pure metal, elements zinc (Zn), copper (Cu), manganese (Mn), scandium (Sc), zirconium (Zr), yttrium (Y), Titanium (Ti) and elemental chromium (Cr) are added in the form of aluminum-based master alloys.

[0058](1) Alloy smelting: using a melting furnace, such as a power frequency induction furnace, adding pure aluminum, Al-50Zn, Al-10Mn, Al-30Cu, Al-2Sc, Al-10Zr, Al-10Cr, Al in sequence during melting -10Ce or Al-10Y, Al-5Ti and other aluminum-based intermediate alloys. After all the metals in the melting furnace are melted, the metal Mg covered with aluminum foil is pressed into the melting furnace with a graphite funnel. The melting temperature is 770°C and the melting time is 20min, so that ...

Embodiment 2

[0068] (1), composition and proportion (mass percentage):

[0069] Zn4.5, Mg2.5, Zr0.18, Sc0.17, Mn0.25, Ti0.08, Cr0.15, Cu0.8, Y0.05, and the balance is Al.

[0070] (2) Preparation process:

[0071] Pure aluminum (aluminum content ≥ 99.9%) and magnesium (Mg) are added in the form of pure metal, elements zinc (Zn), copper (Cu), manganese (Mn), scandium (Sc), zirconium (Zr), yttrium (Y), Titanium (Ti) and elemental chromium (Cr) are added in the form of aluminum-based master alloys.

[0072] (1) Alloy smelting: using a melting furnace, such as a power frequency induction furnace, adding pure aluminum, Al-50Zn, Al-10Mn, Al-30Cu, Al-2Sc, Al-10Zr, Al-10Cr, Al in sequence during melting -10Ce or Al-10Y, Al-5Ti and other aluminum-based intermediate alloys, after all the metals in the melting furnace are melted, the metal Mg covered with aluminum foil is pressed into the melting furnace with a graphite funnel, the melting temperature is 780 ° C, and the melting time is 18min, so ...

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Abstract

The invention relates to a high-intensity welding wire for aluminum-zinc-magnesium-scandium alloy. The high-intensity welding wire comprises the following components of, by mass, 1.0% to 5.0% of Zn, 1.0% to 6.0% of Mg, 0.05% to 0.25% of Sc, 0.05% to 0.25% of Zr, 0.1% to 0.4% of Mn, 0.5% to 1.0% of Cu, 0.05% to 0.25% of Ti, 0.01% to 0.15% of the rare earth element Y or 0.01% to 0.15% of the rare earth element Ce, 0.05% to 0.25% of Cr, and the balance Al. According to the high-intensity welding wire, on the base of Al-Zn-Mg, the small amount of Cu is added so that the extension strength of a joint can be effectively improved, and the Sc and the Zr which are the same in content are added so that the heightening effect of aluminum alloy performance by single Sc can be remarkably improved. In addition, the micro-alloy elements of Ce, Ti, Cr and the like are added so that more excellent structural performance and welding process margins can be obtained, the sensitivity of welding cracks of the alloy can be reduced, comprehensive mechanical performance of the joint can be improved, and the high-intensity welding wire has good stress-corrosion resistant performance.

Description

technical field [0001] The invention relates to a high-strength aluminum-zinc-magnesium-scandium alloy welding wire and a preparation method thereof, which are used for fusion welding of high-strength aluminum-zinc-magnesium-scandium (Al-Zn-Mg-Sc) aluminum alloys and belong to the field of material science and engineering. Background technique [0002] High-strength aluminum-zinc-magnesium-scandium alloy has high specific strength and excellent welding performance. It is another reserve material for aerospace and aviation large-scale structural parts after aluminum-magnesium-lithium alloy and aluminum-magnesium-scandium alloy. High-strength aluminum-zinc-magnesium-scandium alloys have high yield strength and tensile strength, and are the preferred materials for aircraft fuel tanks and rocket storage tanks. In recent years, with the development of the aerospace industry, the application of high-strength weldable aluminum-zinc-magnesium-scandium alloys has been put on the agen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/24B23K35/40
Inventor 雷学锋张凌云张志勇沈江红胡太文张宇玮
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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