Influence of Friction Stir Welding (FSW) on Mechanical and Corrosion Properties of AW-7020M and Aw-7020 Alloys

Author:

Dudzik Krzysztof1,Jurczak Wojciech2

Affiliation:

1. Akademia Morska w Gdyni Wydział Mechaniczny Morska 81-87 81-225 Gdynia, Poland

2. Akademia Marynarki Wojennej Wydział Mechaniczno-Elektryczny Śmidowicza 69, 81-103 Gdynia, Poland

Abstract

Abstract Friction welding associated with mixing the weld material (FSW - Friction Stir Welding ) is an alternative to MIG and TIG welding techniques for Al-alloys. This paper presents experimental results obtained from static tension tests on specimens made of AW-7020M and AW-7020 alloys and their joints welded by using FSW method carried out on flat specimens, according to Polish standards : PN-EN ISO 4136:2011 and PN-EN ISO 6892-1:2010. Results of corrosion resistance tests are also presented. The tests were performed by using the electrochemical impedance spectroscopy (EIS). EIS measurement was conducted with the use of three-electrode system in a substitute sea water environment (3,5% NaCl - water solution). The impedance tests were carried out under corrosion potential. Voltage signal amplitude was equal to 10mV, and its frequency range - 100 kHz ÷ 0,1 Hz. Atlas 0531 EU&IA potentiostat was used for the tests. For the tested object an equivalent model was selected in the form of a substitute electric circuit. Results of the impedance spectroscopy tests are presented in the form of parameters which characterize corrosion process, as well as on Nyquist’s graphs together with the best-fit theoretical curve. Analysis of the test results showed that the value of charge transfer resistance through double layer , Rct , for the FSW-welded specimen , was lower than that for the basic material, and that much greater difference was found in the case of AW-7020M alloy. The impedance spectroscopy tests showed that both the FSW-welded joints and basic material of AW-7020M and AW-7020 alloys were characterized by a good resistance against electrochemical corrosion in sea water environment , and that FSW-welded joints revealed a greater corrosion rate.. The performed tests and subject-matter literature research indicate that application of FSW method to joining Al-alloys in shipbuilding is rational.

Publisher

Walter de Gruyter GmbH

Subject

Mechanical Engineering,Ocean Engineering

Reference16 articles.

1. 1. Bugłacki H., Neser G.: Properties of welded Al-alloys applicable in shipbuilding (in Polish). Biuletyn Instytutu Spawalnictwa w Gliwicach (Bull. of Welding Institute, Gliwice), No. 5/2001.

2. 2. Cudny K., Puchaczewski N.: Metal alloys for ship hull structures and ocean engineering objects ( in Polish). Wydawnictwo Politechniki Gdańskiej ( Publishing House of Gdańsk University of Technology), Gdańsk 1995.

3. 3. Czechowski M.: Effect of anodic polarization on stress corrosion cracking of some aluminium alloys, Advances in Materials Science, Vol 7, pp. 13-20, number 1(11) 2007.

4. 4. Czechowski M.: Low-cycle fatigue of friction stir welded Al-Mg alloys. Journal of Materials Processing Technology, 164-165(2005), pp. 1001÷1006.

5. 5. Dudzik K., Czechowski M.: Analysis of possible shipbuilding application of Friction Stir Welding (FSW) method to joining elements made of AlZn5Mg1 alloy. Polish Maritime Research No.4/2009.

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