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Method for improving aluminum alloy weld joint strength and crack resistance

A welding seam strength and aluminum alloy technology, applied in the field of non-ferrous metals and their preparation, can solve the problem that the strength of welded joints does not reach the strength level of 7xxx series alloys, and achieve the effect of no welding hot cracks

Active Publication Date: 2017-11-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lower alloy degree of this type of alloy compared with the 7xxx series alloy, the strength of the welded joint still does not reach the strength level of the 7xxx series alloy, which makes its application have certain limitations.

Method used

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  • Method for improving aluminum alloy weld joint strength and crack resistance
  • Method for improving aluminum alloy weld joint strength and crack resistance
  • Method for improving aluminum alloy weld joint strength and crack resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] All the experimental alloys and reference alloys involved in this example were prepared in the laboratory. The equipment used in the alloy preparation process and the general process (smelting, rolling, annealing, etc.) The ingredients and uses are listed in Table 1.

[0021] Table 1 Alloy chemical composition used in this example invention and application table (mass percentage, wt%)

[0022]

[0023] The preparation process of the alloy plate described in this example is as follows: smelting and casting→two-stage homogenization annealing→hot rolling deformation→intermediate annealing→cold rolling deformation→solution quenching→two-stage aging to T6 state.

[0024] The two-stage homogenization annealing process of the ingot is as follows: the ingot is heated from room temperature to 420-440°C at a rate of 20-40°C / s and kept for 3-8 hours, and then heated at a rate of 20-40°C / s to Keep warm at 500-535°C for 5-15 hours, and finally cool the ingot to room temperature ...

Embodiment 2

[0040] The invention and gold composition used in this example are shown in Table 4, the mass fraction of the main alloying element Zn is reduced to 2.5%, and the mass fraction of Mg is reduced to 4.5%.

[0041] Table 4 The alloy chemical composition and application table (mass percentage, wt%) used in this example invention

[0042]

[0043] The welding and post-weld aging process of the alloy plate described in this example is as follows:

[0044] The specific working parameters of the MIG welding machine used are: loading ER5556 welding wire, welding machine working current, welding machine working current 75A, working voltage 10.5V, arc start dwell time 2.0s, wire filling speed 7m / min, welding speed 8mm / s, The flow rate of argon gas is 16.5L / min, and the welded plates are subjected to appropriate natural aging or artificial aging. The specific process of post-welding artificial aging is: heat the welded plates to 95°C and keep them warm for 170h, and then air-cool to ob...

Embodiment 3

[0047] The invention and gold composition used in this example are shown in Table 5, the mass fraction of the main alloying element Zn increased to 3.5%, and the mass fraction of Mg increased to 6%.

[0048] Table 5 The chemical composition and application table (mass percentage, wt%) of the alloy used in this example invention

[0049]

[0050] The welding and post-weld aging process of the alloy plate described in this example is as follows:

[0051] The working parameters of the MIG welding machine used are as follows: loading ER5556 welding wire, welding machine working current, welding machine working current 105A, working voltage 14.5V, arc start dwell time 0.5s, wire filling speed 8m / min, welding speed 12mm / s, The argon gas flow rate is 15L / min, and the welded plate is subjected to appropriate natural aging or artificial aging. The specific process of the artificial aging after welding is: heating the welded plate to 105°C and keeping it warm for 150h, and then air c...

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Abstract

The invention discloses a method for improving aluminum alloy weld joint strength and crack resistance and belongs to the field of nonferrous metals and preparation of nonferrous metals. The method comprises the steps that Al-Mg-Zn system alloy plates prepared from, by mass, 4.0-7.0% of Mg, 2.0-4.0% of Zn, 0-0.6% of Cu, 0.1-1.2% of Mn, 0-0.1% of Cr, 0-0.25% of Ti, 0-0.3% of Zr, 0-0.6% of Fe, 0-0.6% of Si and the balance Al are subjected to MIG welding, and artificial aging treatment is carried out after welding. Due to the fact that Al-Mg-Zn ally has the aging precipitation ability, the weld joint strength is greatly improved compared with 5xxx system reference alloy(AA5059 and AA5083) through welding and post-welding aging reinforcement and is approximate to the weld joint strength level of 7xxx system reference alloy, the weld crack resistance of the weld joint is approximate to that of 5xxx system reference alloy and obviously better than that of 7xxx system reference alloy, no weld heat crack is produced, and the method is quite applicable to production and manufacturing processes of ships and decks.

Description

technical field [0001] The invention belongs to the field of non-ferrous metals and their preparation, and in particular relates to a method for improving the strength and crack resistance of aluminum alloy welds, which is applicable to the manufacturing process of ships and armor plates. Background technique [0002] In the ship transportation and military armor industries, it has become a new trend to use high specific strength aluminum alloy materials to replace traditional steel materials, which can significantly reduce the overall weight of ships and armored vehicles while ensuring the strength of the alloy in use, thereby Significantly improve the fuel utilization efficiency of ships and the combat maneuverability of armored vehicles. Since ship and armor materials have the characteristics of large area and high span, metal connection technology (mainly welding) must be used in the production process to connect small-sized raw materials to each other. Therefore, the we...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/047C22C21/08C22C21/06C21D9/50B23K9/173B23K9/095
CPCB23K9/095B23K9/173C21D9/50C22C21/06C22C21/08C22F1/047
Inventor 张迪赵鑫侯胜利张济山庄林忠
Owner UNIV OF SCI & TECH BEIJING
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