Tensile behaviour of mig welded hydrogenated Al-alloy EN AW-5083

Dolić, Natalija and Malina, Jadranka and Kožuh, Zoran and Garašić, Ivica and Tunić, Jozef (2012) Tensile behaviour of mig welded hydrogenated Al-alloy EN AW-5083. = Tensile behaviour of mig welded hydrogenated Al-alloy EN AW-5083. In: European Conference on Welding, Joining and Cutting (8 ; 2012), Pula, Hrvatska.

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Abstract

In this paper the influence of hydrogenation on mechanical properties and microstructure of MIG double-side welded EN AW-5083 aluminium alloy was investigated. According to the results obtained from tensile tests, there was no significant difference in yield and tensile strength between uncharged and H-charged weld, but elongation and contraction were decreased in the hydrogenated specimen. Such tensile behaviour suggests that hydrogen was absorbed in amount high enough to cause the embrittlement of welded joints, which is confirmed by embrittlement index IHE = 20.9%. Detachment between base metal and weld started at the weld-root and afterwards the main crack continues spreading along the fusion line characterized by as-cast microstructure with fine equiaxed columnar grains. A great number of grain boundaries could be considered as H-traps and the sites from where initial microcracks start.

Item Type:	Conference or Workshop Item (Poster)
Keywords (Croatian):	MIG double-side welding ; electrochemical hydrogenation ; mechanical properties ; microstructure ; as-cast aluminum alloy EN AW- 5083
Subjects:	TECHNICAL SCIENCE > Mechanical Engineering
Divisions:	1100 Department of Welded Structures > 1110 Chair of Welded Structures
Date Deposited:	21 Sep 2016 11:50
Last Modified:	21 Sep 2016 11:50
URI:	http://repozitorij.fsb.hr/id/eprint/6716

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