Stress corrosion cracking of 7020 aluminium alloy jointed by different welding methods

• Autorzy: Dudzik K.
• Języki publikacji: EN

Abstrakty

EN

The results of stress corrosion cracking (SCC) of aluminum alloy AW 7020 [AlZn5Mg1] welded by friction stir welding FSW and MIG were presented. Friction Stir Welding (FSW) - a new technology can be successfully used for butt welding of different types of aluminum alloy sheets. In the article the parameters for friction stir welding ofsheets made of AlZn5Mg1 [7020] alloy was presented as well as parameters for MIG. Metallographic analysis of bonds showed a proper structural construction of both, the FSW and MIG welded 7020 aluminum alloys. Stress corrosion cracking was examined via the slow-strain-rate-testing (SSRT) according to EN ISO 7539-7. The following parameters were measured: time-to-failure - T [h], obtained max. load - F [N]; strain energy (the diagram surface under the stress-elongation curve) - E [MJ/m3]; relative elongation of the specimen — a10 [%]; max. tensile stress — R [MPa] and contraction — Z [%]. The tests were carried out on cylindrical notch-free specimens in the air and 3.5% water solution NaCl. Good resistance to stress corrosion was found of friction stir welded 7020 aluminum alloys. The tested samples cracked during SSRT test in the native material in case of FSW and in the joint in case of MIG. Original value are received results of the stress corrosion resistance of new method friction stir welded AlZn5Mg1 alloy compared with traditional MIG method.

Słowa kluczowe

EN

aluminium alloys; friction stir welding (FSW); MIG welding; stress corrosion cracking; mechanical properties; slow-strain-rate-testing

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2010
• Tom: Vol. 17, No. 4
• Strony: 143--147
• Opis fizyczny: Bibliogr. 11 poz., rys.

Twórcy

autor

Dudzik K.

• Gdynia Maritime University, Faculty of Marinę Engineering Morska Street 81-87, 81-225 Gdynia, Poland tel: [phone], fax: [phone],

Bibliografia

• [1] Anderson, T., New developments within the Aluminium Shipbuilding Industry, Svetsaren, Vol. 58, No. 1, pp. 3-5, 2003.
• [2] Bugłacki, H., Wpływ technologii spawania na odporność korozyjna stopów Al-Zn International Conference on Environmental Degradation of Engineering Materials, Politechnika Gdańska, pp. 260-267, Jurata 1999.
• [3] Cudny, K., Puchaczewski, N., Stopy metali na kadłuby okrętowe, Politechnika Gdańska, Gdansk 1995.
• [4] Czechowski, M., Effect of anodic polarization on stress corrosion cracking of some aluminium alloys, Advances in Materials Science, Vol. 7, No. 1 (11), pp. 13-20, 2007.
• [5] Czechowski, M., Low-cycle fatigue of friction stir welded Al-Mg alloys, Journal of Materials Processing Technology, 164-165, pp. 1001-1006, 2005.
• [6] Czechowski, M., Własności złączy doczołowych blach ze stopów Al-Mg spajanych różnymi metodami, Materiały i Technologie, Politechnika Gdańska, Nr 1 (1), s. 16-19, Gdańsk 2003.
• [7] Czechowski, M., Chrzanowski, J., Zieliński, A., Naprężeniowe pękanie korozyjne złączy spawanych stopów aluminium, Materiały II Pomorska Konferencja Naukowa – Inzynieria Materiałowa 2001, Politechnika Gdańska, Sobieszewo 2001.
• [8] Czechowski, M., Pietras, A., Zadroga, L., Własności stopów aluminium serii 5000 zgrzewanych tarciowo nowa technologia FSW, Inżynieria Materiałowa, Nr 6, pp. 264-266, 2003.
• [9] Czechowski, M., Zieliński, A., Effect of cathodic polarization on failure and degradation of mechanical properties of some aluminium alloys, Scripta Metallurgy Materials, Vol. 30, 1994.
• [10] Lahti, K., FSW – possibilities in shipbuilding, Svetsaren, Vol. 58, No. 1, pp. 6-8, 2003.
• [11] PN-EN ISO 7539-7: 2000. Badania korozji naprężeniowej. Próba odkształcenia z małą prędkością.