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Metal welding test piece low temperature mechanical property optical test method

A technology for optical testing and metal welding, which is used in the application of stable tension/pressure to test the strength of materials, measuring devices, scientific instruments, etc. Avoid frosting effects

Active Publication Date: 2016-06-01
BEIJING INST OF STRUCTURE & ENVIRONMENT ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problem that the existing metal welding structure mechanical performance testing method is not suitable for low temperature and ultra-low temperature environments, and to provide an optical testing method for low temperature mechanical performance of metal welding test pieces

Method used

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  • Metal welding test piece low temperature mechanical property optical test method
  • Metal welding test piece low temperature mechanical property optical test method
  • Metal welding test piece low temperature mechanical property optical test method

Examples

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Embodiment 1

[0030] A method for testing the low-temperature mechanical properties of a metal welded test piece, comprising the following steps in sequence:

[0031] Step 1. Make welding test piece 1, butt-weld two metal material sheets to be tested to form a dumbbell-shaped standard tensile test piece, and divide welding test piece 1 into welding zone, heat-affected zone 1-2 and base metal zone 1 -3; In order to facilitate test identification, first spray white primer on the upper surface of welding test piece 1, and then spray black paint to form a speckle pattern, which is used to identify different positions of the test piece;

[0032] Step 2. Fix one end of the welding test piece 1, apply a load to the other end along the axial direction of the welding test piece 1, and then place the welding test piece 1 in an ultra-low temperature environment; the low temperature environment is formed by liquid nitrogen medium or other liquid that can provide a low temperature environment The medium...

Embodiment 2

[0043] In this embodiment, the research on the mechanical properties of the tank structure of the spacecraft is mainly carried out. Most spacecraft tank structures are welded, and the weak link of the structure usually lies in the welds. The mechanical properties of the welds determine the load-carrying capacity of the structure, so the research is mainly on the mechanical properties of the welds. Because the actual structure of the spacecraft storage tank is complex and the volume is large, the low-temperature test period for the storage tank entity is long, the cost is high, and the implementation is difficult. Therefore, the technical solution of the present invention uses welding test pieces to simulate the actual welding structure.

[0044] An optical test method for low-temperature mechanical properties of an aluminum alloy welded test piece, comprising the following steps in sequence:

[0045] Step 1. Make welding test piece 1, and use variable polarity argon arc weldin...

Embodiment 3

[0060] On the basis of Example 2, two metal sheets are welded by friction stir welding in step 1, and other steps are the same as in Example 2 to obtain the strain values ​​of each area and the overall strain value J of the friction stir welding test piece 11, and obtain The relationship between the applied load and the strain value of the welded aluminum alloy welding test piece 11 is as follows: image 3 Shown; Calculate the engineering stress, test stress, strength limit and elongation of each region and the welding test piece 11 as a whole, and obtain the statistical results of the mechanical properties of the friction stir welding welding test piece 11 as shown in Table 2.

[0061] Table 2. Statistical statistics of mechanical properties of friction stir welding test pieces

[0062]

[0063] Such as Figure 4 As shown, when the load is between 0-26kN, the load-strain curve of the weld, that is, the heat-affected zone 1-2, is relatively straight, that is, the structure...

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Abstract

The invention belongs to the technical field of structure low temperature mechanical property test analysis and relates to a metal welding test piece low temperature mechanical property optical test method. The optical test method comprises preparing a welding test piece, dividing the welding test piece into a welding zone, a heat influence zone and a base material zone, putting the welding test piece in a low temperature environment, installing a digital camera above the welding test piece at an interval, connecting the digital camera to a data acquisition system through a data line, calculating strain values through speckle images of the welding test piece before and after loading, and calculating engineering stress, test stress, strength limits and elongation of the whole welding test piece and all zones of the welding test piece so that mechanical property parameters of the welding test piece are obtained. The method is suitable for testing mechanical properties of an aluminum alloy, other metals and structures welded through different welding methods in a low temperature environment. The welding test piece is divided into different zones so that the technical problem that the existing optical test method cannot detect mechanical properties in a low temperature environment.

Description

technical field [0001] The invention belongs to the technical field of low-temperature mechanical performance testing and analysis of structures, and in particular relates to an optical testing method for low-temperature mechanical performance of metal welding test pieces. Background technique [0002] Cryogenic technology is widely used in the aerospace field. Spacecraft components may be subjected to vacuum and low temperature in the aerospace environment. It is required that the structure has high strength under low temperature conditions and maintains good toughness and low thermal performance parameters. At the same time, physical properties such as light weight are required. . The main structural materials used in aerospace low-temperature structural devices at home and abroad include titanium-based alloys, aluminum-based alloys, iron-nickel-based and nickel-based low-temperature alloys, and metal-based composite materials. Among these materials, especially aluminum a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/18G01N3/06
Inventor 周江帆吴兵杨蓉郭文婧王梦魁刘云岭张辉李瑞明陈永坤巴晓蕾
Owner BEIJING INST OF STRUCTURE & ENVIRONMENT ENG
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