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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2013, Vol. 34 ›› Issue (9): 2161-2168.doi: 10.7527/S1000-6893.2013.0064

• Solid Mechanics and Vehicle Conceptual Design • Previous Articles     Next Articles

Properties and Prediction of Pre-corrosion Strength of Aluminum Alloy Welded Joints

ZHANG Junmiao1, NIE Hong1, XUE Caijun1, WU Huiqiang2, YAN Dongyang2   

  1. 1. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
    2. Beijing Institute of Astronautical Systems Engineering, Beijing 100076, China
  • Received:2012-10-19 Revised:2013-01-04 Online:2013-09-25 Published:2013-01-17
  • Supported by:

    Natural Science Foundation of Jiangsu Province (BK2012795)

Abstract:

In order to ensure the durability of welded structures used for long-term storage of corrosive solutions in the aerospace field, it is necessary to study the pre-corrosion strength properties of welded joints. Corrosion tests of welded joint specimens AA2219-T87 are conducted in an acid solution to obtain the corrosion property data of the welded joints and base metal, and the differences of corrosion properties between the welded joint and base metal are summarized. Based on the data of corrosion tests and welded joint local strength tests, a finite element method is used to predict the pre-corrosion strength and fracture position of welded joints, the results of which are verified by pre-corrosion tensile tests. The study shows that the major characteristic of a welded joint's corrosion resistance is the existence of obvious differences of corrosive resistance among the weld zone, the heat affected zone and the base metal. The corrosion resistance is an important factor for the pre-corrosion strength of welded joints, and its influence increases with time, leading to the translocation of fracture positions of long-time corroded specimens from areas of poor mechanical property to areas of poor corrosion property during tensile tests. The proposed prediction method of welded joint pre-corrosion strength can yield accurate results with a minimum number and scale of tests.

Key words: welded joints, aluminum alloy, corrosion, finite element method, corrosion resistance

CLC Number: