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Al-Mg alloy welding wire and preparation method thereof

A technology of alloy welding wire and test method, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of poor mechanical properties, high melting point, virtual welding of weldments, etc., to improve comprehensive mechanical properties and excellent corrosion resistance. , excellent mechanical properties

Active Publication Date: 2022-06-07
中力鸿(深圳)新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the performance of the current welding wire has been improved, due to the high melting point of the Al-Mg alloy welding wire during the welding process, easy oxidation, poor wettability between the solder and the base metal, etc. The problem of poor quality is still not effectively solved

Method used

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  • Al-Mg alloy welding wire and preparation method thereof
  • Al-Mg alloy welding wire and preparation method thereof
  • Al-Mg alloy welding wire and preparation method thereof

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preparation example Construction

[0052] The preparation method of Al-Mg alloy welding wire described in the first aspect of the present invention comprises the following steps:

[0053] S1) Weigh aluminum ingots, aluminum intermediate alloys and rare earth alloy ingots according to the composition ratio of Al-Mg alloy welding wire, clean and dry them for later use;

[0054] S2) transfer the raw materials into the smelting furnace, heat and smelt, and stir evenly after removing the slag;

[0055] S3) Refining under the protection of protective gas, removing slag after refining, standing and filtering, and casting to obtain alloy ingots;

[0056] S4) Uniformly anneal the alloy ingot at 470-530° C. for 18-38 hours, hot-extrude the wire rod, and draw step by step to obtain Al-Mg alloy welding wire.

[0057] The smelting temperature should be sufficient to fully melt and mix the raw materials. In some examples of the preparation method, the melting temperature is 740°C-770°C.

[0058] The temperature of refinin...

Embodiment 1

[0066] 1) Take Mg: 4.5 wt%, Cr: 0.15 wt%, Mn: 0.25 wt%, Si: 0.4 wt%, Ti: 0.10 wt%, Zn: 0.2 wt%, Sc: 0.05 wt %, Zr: 0.05 wt %, Bi: 0.05 wt %, Tl: 0.05 wt %, the balance is Al; smelt pure Al in a melting furnace at a melting temperature of 770 °C until it melts; reduce the temperature of molten aluminum to 710 °C , add Al-5Cr, Al-20Mn, Al-20Si, Al-5Ti master alloys, and melt them all; the alloy melt is cooled to 690 ° C, add pure Mg, Zn ingots, and keep warm until they are completely melted; add multi-element refining agents and remove After the air agent is refined and degassed and slag removed, it is left to stand for 20 minutes; the temperature is raised to 710°C, filtered, and cast to obtain an alloy ingot;

[0067] 2) Homogenize the cast ingot with a homogenization temperature of 470°C for 24 hours; perform hot extrusion on the alloy cast ingot to obtain a wire rod with a diameter of 8mm and an extrusion ratio of 24;

[0068] 3) drawing forming: get the extruded wire rod p...

Embodiment 2

[0070] 1) Mg: 4.0 wt%, Cr: 0.10 wt%, Mn: 0.1 wt%, Si: 0.2 wt%, Ti: 0.15 wt%, Zn: 2.0 wt%, Sc: 0.05 wt%, according to the weight percentage of the constituent elements Zr: 0.05 wt %, Bi: 0.05 wt %, Tl: 0.05 wt %, the balance is Al; smelt pure Al in a melting furnace at a melting temperature of 740 °C until it melts; reduce the temperature of molten aluminum to 720 °C , add Al-5Cr, Al-20Mn, Al-20Si, Al-5Ti master alloys, and melt them all; cool the alloy melt to 710°C, add pure Mg, Zn ingots, and keep warm until they are completely melted; add multi-element refining agents and remove After the air agent is refined and degassed and slag removed, it is left to stand for 20 minutes; filtered and cast to obtain alloy ingots;

[0071] 2) Homogenize the ingot with a homogenization temperature of 530°C for 24 hours; perform hot extrusion on the alloy ingot to obtain a wire rod with a diameter of 8 mm and an extrusion ratio of 24;

[0072] 3) drawing forming: get the extruded wire rod ...

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Abstract

The invention discloses an Al-Mg alloy welding wire and a preparation method thereof. The Al-Mg alloy welding wire comprises the following components in percentage by weight: 4.0%-4.5% of Mg, 1.2%-2.0% of Zn, 0.1%-0.15% of Cr, 0.1%-0.25% of Mn, 0.2%-0.4% of Si, 0.10%-0.15% of Ti, 0.05%-0.2% of Sc, 0.05%-0.2% of Zr, 0.05%-1.5% of late transition metal and the balance of aluminum. The Al-Mg alloy welding wire of some examples is low in melting point and good in base metal wettability, the strength can reach 423 Mpa, the ductility can reach 13.3%, the mechanical property is excellent, and meanwhile the Al-Mg alloy welding wire further has excellent corrosion resistance. The method can be used for welding various high-strength aluminum alloys, pseudo soldering, insufficient soldering and hot cracks of weldments are effectively avoided, and the comprehensive mechanical property of a welded joint is remarkably improved.

Description

technical field [0001] The invention belongs to the field of new materials, and in particular relates to an Al-Mg alloy welding wire with a low melting point and good wettability and a preparation method thereof. Background technique [0002] Due to its high specific strength, excellent corrosion resistance and good weldability, aluminum alloys have been widely used in marine industry, automobiles, high-speed trains, aerospace and other fields. In actual production, welding technology is often used to connect aluminum alloys, and Al-Mg series welding wires are often used for welding 5-series, 6-series and 7-series aluminum alloys. Due to the characteristics of aluminum alloys such as easy oxidation, large thermal expansion coefficient, and high temperature-affected hydrogen solubility, the wettability between the welding wire and the welding base metal deteriorates, and there are unavoidable defects and welding deficiencies in the welding structure, such as slag inclusions a...

Claims

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Application Information

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IPC IPC(8): B23K35/28B23K35/40
CPCB23K35/288B23K35/40
Inventor 王斌谭盼秦晋
Owner 中力鸿(深圳)新材料科技有限公司
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