High-weld-strength Al-Mg-Si alloy and section bar preparation method thereof

An al-mg-si, welding strength technology, applied in the field of metal alloys, can solve problems such as joint strength softening, and achieve the effect of simple process

Inactive Publication Date: 2013-04-17
SNTO TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the application of Al-Mg-Si alloys in transportation vehicles, the disadvantage is that after Mig / Tig gas shielded welding, the strength of the joints softens severely

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: The high welding strength Al-Mg-Si alloy of this embodiment, its alloy composition and its mass percentage are: Mg0.55%, Si0.69%, Mn0.27%, Cr0.13%, Fe0.16 %, Cu0.25%, Ti0.01%, Er0.25%, Zr0.5%, and the rest is Al content.

[0019] The above-mentioned high welding strength Al-Mg-Si alloy profile preparation method is as follows:

[0020] (1) Raw material preparation: pure aluminum, pure magnesium, pure iron, pure copper, Al-Si master alloy, Al-Mn master alloy, Al-Cr master alloy, Al-Zr master alloy, Al-Sc master alloy, The Al-Er master alloy and the Al-Ti alloy are used as raw materials, and the proportioning is carried out according to the above alloy components and their mass percentages.

[0021] (2) Alloy smelting: The prepared alloy raw materials are heated, smelted and liquefied under the protection of covering agent or inert gas, and the melting temperature is 740-760°C.

[0022] (3) Casting of aluminum alloy ingots: Stir the liquefied alloy raw mat...

Embodiment 2

[0030] Embodiment 2: Compared with Embodiment 1, the difference of this embodiment is: the alloy composition and its mass percentage of this embodiment are: Mg0.60%, Si0.77%, Mn0.35%, Ti0.05%, Cr0.14%, Fe0.08%, Cu0.43%, Sc0.53%, Zr0.62%, and the rest is Al content.

[0031] The obtained high welding strength experiment results of the 3mm thick hollow section are: the tensile strength of the base metal is 312Mpa, the tensile strength of the welded joint is 227.5Mpa, and the welding strength is 72.9% of the base metal.

Embodiment 3

[0032] Embodiment 3: Compared with Embodiment 1, the difference of this embodiment is: the alloy composition and its mass percentage of this embodiment are: Mg0.5%, Si0.63%, Mn0.33%, Cr0.15%, Fe0.25%, Cu0.34%, Ti0.02%, Er0.5%, and the rest is Al content.

[0033] The obtained high welding strength experiment results of the 3mm thick hollow section are: the tensile strength of the base metal is 269Mpa, the tensile strength of the welded joint is 185Mpa, and the welding strength is 68.8% of the base metal.

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Abstract

The invention provides a high-weld-strength Al-Mg-Si alloy which comprises the following components in percentage by weight: 0.5-0.9% of Si, 0.4-0.7% of Mg, less than 0.5% of Mn, less than 0.3% of Cr, 0.12-0.5% of (Mn+Cr), less than 0.35% of Fe, less than 0.2% of Zn, less than 0.1% of Ti and 0.2-0.5% of Cu. In addition, the alloy further comprises one of more of 0.2-0.8% of Er, 0.2-0.6% of Zr and 0.3-1.2% of Sc, less than or equal to 0.15% of the balance of other components of the alloy and the balance of Al. Meanwhile, the invention further provides a method for preparing an alloy section bar. According to the Al-Mg-Si alloy provided by the invention, the weld strength is remarkably improved, and the alloy section bar preparation method provided by the invention is further simpler in process.

Description

technical field [0001] The invention belongs to the technical field of metal alloys, in particular to an Al-Mg-Si alloy with high welding strength and a preparation method for a profile thereof. technical background [0002] 6××× Al-Mg-Si alloy is based on Mg 2 Heat treatment with Si as the alloy strengthening phase can strengthen the aluminum alloy, which has the characteristics of good formability, good corrosion resistance, etc., and is widely used in rail transit, civil construction, engineering machinery, electronic components and other fields. Among them, rail vehicles and lightweight road traffic vehicles mostly adopt the overall welding structure of aluminum alloys such as 6005, 6005A, and 6N01, and parts that require high strength locally use aluminum alloy profiles such as 6061 and 6082. Welding methods mainly include Mig / Tig gas shielded welding, laser welding, friction stir welding, etc. Among them, Mig / Tig gas shielded welding is the most used method. However,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C21/08C22C1/03C22F1/043C22F1/047C22F1/05
Inventor 不公告发明人
Owner SNTO TECH GRP
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