Welded structural member having excellent stress corrosion cracking resistance and method for manufacturing same

A technology of stress corrosion resistance and welded structure, applied in the direction of manufacturing tools, welding equipment, welding/welding/cutting items, etc. The effect of improving cracking resistance, easy strength, and improving stress corrosion cracking resistance

Pending Publication Date: 2022-05-27
FURUKAWA SKY ALUMINUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when joining 7000-series aluminum alloy materials by arc welding, etc., the strength will decrease due to the influence of heat in the vicinity of the welded part, and the corrosion resistance and stress corrosion cracking resistance will also decrease.

Method used

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  • Welded structural member having excellent stress corrosion cracking resistance and method for manufacturing same
  • Welded structural member having excellent stress corrosion cracking resistance and method for manufacturing same
  • Welded structural member having excellent stress corrosion cracking resistance and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] Tables 1 to 3 will be used to describe the examples of the above-mentioned welded structural members.

[0088] In this example, a 7000-series aluminum alloy material obtained by changing the chemical composition within the above-mentioned alloy composition range was produced as an extruded profile under the same conditions. The measurement of the electrical conductivity before and after the artificial aging treatment and the measurement of the strength of the base material were performed for this extruded profile. Furthermore, after welding the surface of the above-mentioned base metal sample, on the sample heat-treated under the same conditions, the electrical conductivity measurement of the welding heat-affected zone, the strength measurement, and the SCC (Stress Corrosion Cracking: Stress Corrosion Corrosion) were performed. cracks) test.

[0089] Hereinafter, the manufacturing conditions, the strength measurement method, the electrical conductivity measurement meth...

Embodiment 2

[0129] Examples of the manufacturing method of the above-mentioned welded structural member will be described with reference to Tables 4 to 6.

[0130] In this example, for the 7000 series aluminum alloy material within the above alloy composition range, for the extruded profile manufactured under the same conditions, artificial aging treatment samples were prepared under different conditions, and the strength of the base metal was measured. . Furthermore, after welding the surface of the above-mentioned base metal sample, the electrical conductivity measurement and SCC test of the heat-affected zone of welding were performed on the samples that were heat-treated under different conditions. Hereinafter, the manufacturing conditions, the strength measurement method, the electrical conductivity measurement method, and the SCC test method of each sample will be described.

[0131]

[0132] Manufacturing method of extruded profiles:

[0133] Among the compositions described in...

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Abstract

A welded structural member having excellent stress corrosion cracking resistance comprises a 7000-series aluminum alloy material having a chemical composition and including a metal structure as a fibrous structure containing 6.6 mass% to 8.5 mass% of Zn, 1.0 mass% to 2.1 mass% of Mg, 0.10 mass% to 0.20 mass% of Zr, and 0.001 mass% to 0.05 mass% of Ti, the remainder comprising Al and unavoidable impurities, and another aluminum alloy material welded to the 7000-series aluminum alloy material. The welded structural member satisfies 0.120 < = (Y / X-1) < = 0.250, where X% IACS is the electric conductivity of the 7000 series aluminum alloy material before artificial aging treatment and Y% IACS is the electric conductivity after artificial aging treatment; the difference between the electric conductivity of the base material part except the welding heat-affected part of the 7000 series aluminum alloy material and the electric conductivity of the welding heat-affected part is within 5% IACS (International Annealed Copper Standard).

Description

technical field [0001] The present invention relates to a welded structural member excellent in resistance to stress corrosion cracking and a method for manufacturing the same. Background technique [0002] The use of high-strength and light-weight 7000-series aluminum alloy materials has been increasing as a material for members requiring lightweight such as conveying equipment. [0003] Regarding the 7000 series aluminum alloy material, on the one hand, it has high mechanical properties, but on the other hand, there is concern about the occurrence of stress corrosion cracking. In addition, when 7000 series aluminum alloy materials are joined by arc welding or the like, in the vicinity of the welded portion, due to thermal influence, the strength decreases, and the corrosion resistance and stress corrosion cracking resistance also decrease. [0004] As a method for improving the stress corrosion cracking property of a 7000 series aluminum alloy material, Patent Document 1 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22F1/053B23K9/167B23K9/173
CPCC22C21/10C22F1/053B23K9/167B23K9/173B23K9/23B23K2103/10B23K31/00
Inventor 赤土周平热田贤
Owner FURUKAWA SKY ALUMINUM CORP
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