Effects of Preheating and Cooling Rate on the Microstructure and Mechanical Properties of Tungsten Inert Gas Welded Join
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JMEPEG https://doi.org/10.1007/s11665-020-05116-x
Effects of Preheating and Cooling Rate on the Microstructure and Mechanical Properties of Tungsten Inert Gas Welded Joints of AA5083-H321 Aluminum Alloy P. Shahsavari and H.R. Rezaei Ashtiani (Submitted June 3, 2020; in revised form August 15, 2020) Various preheating treatment and cooling rates conditions were carried out in Tungsten Inert Gas welding to study mechanical behavior and microstructural evolution of AA5083-H321 aluminum alloy welded joints. The microstructural analysis illustrated the diverse grain size during welding at different preheating and cooling rate. The highest preheat temperature caused to enlarge dendritic grains and during the fastest cooling rate formed the smaller grains. Also, the texture and grain size impressed on tensile behavior and hardness welds. Grain structure of the heat-affected zone, partially melted zone, and weld metal appeared to have a tangible relationship with preheating and cooling rate conditions. The microhardness of these regions increased by increasing the cooling rate and decreasing the preheating temperature. The high preheating had a negative effect on the hardness and width of different zones of welded joints. The results showed that the cooling rate has remarkable effects on the mechanical properties of the welded specimen. Keywords
AA5083-H321 aluminum alloy, cooling rate, mechanical properties, microstructure, preheating, TIG welding
1. Introduction The strain hardenable Al-Mg alloys especially AA5083 aluminum alloy, due to having excellent corrosion resistance, low-temperature performance, individual strength-to-weight ratio, and reasonable weldability, are extensively used in manufacturing high efficient lightweight vessels in marine industries (Ref 1-4). Generally, welding technologies of aluminum alloys play a crucial role in fabricating the aluminum alloy parts. Such technologies as arc welding (Ref 5, 6), solidstate welding (Ref 7, 8), and high energy beam welding (Ref 9, 10) have been applied to the Al-Mg alloy welding. TIG welding method is an arc welding technology which, because of its highly utilized industrial interaction along with high efficiency, acceptable quality, and reasonable cost, has been adopted as one of the most popular welding processes involving marine aluminum alloys (Ref 11, 12). After welding, there exists several mechanical and microstructural problems including the decrease in weld joints strength, the expansion of the heat-affected zone (HAZ) which are all associated with heat input and cooling rates on the AlMg aluminum alloy welding, causing remarkable changes in the microstructure, porosities and voids formation (Ref 13-15). According to the above, many studies have investigated the P. Shahsavari and H.R. Rezaei Ashtiani, School of Mechanical Engineering, Arak University of Technology, Arak 38135-1177, Iran. Contact e-mails: [email protected] and [email protected].
Journal of Materials Engineering and Performance
effects of welding parameters on the mechanica
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