STRESS CORROSION CRACKING OF WELDED JOINTS OF Al-Mg ALLOYS

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STRESS CORROSION CRACKING OF WELDED JOINTS OF Al-Mg ALLOYS

Journal Title: Journal of KONES - Year 2014, Vol 21, Issue 3

Abstract

Slow strain rate testing (SSRT) was used to test the stress corrosion cracking (SCC) of aluminium alloys AW 5083 and AW 5059 (Alustar) jointed by friction stir welding (FSW). The test was carried out in the air and 3.5% water solution NaCl. Cylindrical notch-free specimens and cylindrical notched specimens (R = 5 mm) were used. 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 [MAJ/m3]; relative elongation of the specimen – A11.3 [%]; max. tensile stress – R [MPa] and narrowing – Z [%]. On the basis of obtained results, it was noted that FSW-welded joints show superior strength and resistance to stress corrosion, compared to MIG-welded joints. The fractions after SSRT testingwere cleaved with some ductile areas. This article also gives the mechanical features of friction stir welded Al-Mg alloys. Tests have shown that the 5059 alloy, welded by FSW, has superior strength properties compared to the FSW 5083 alloy, along with comparable, good resistance to stress corrosion. FSW 5083 alloy joints have very good resistance to stress corrosion - better than those made using traditional welding methods (MUG). Original value are received results of the stress corrosion resistance of new method friction stir welded Al-Mg alloy compared with traditional MIG method.

Authors and Affiliations

Mirosław Czechowski

Keywords

PREDICTION OF ESTIMATES OF TECHNICAL OBJECT’S RELIABILITY ON THE BASIS OF DAMAGE DETERMINED FROM LINDBERG LEVY’S CLAIM AND MULTIPLICITY OF THE SET SPECIFIED FROM ERGODICITY STREAM DAMAGE

EP ID EP70949
DOI 10.5604/12314005.1133154
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