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Effect of artificial ageing temperature in T6-heat treatment on the mechanical properties of dissimilar metals weld between AA5083 and AA6063

Setyawan H., Muhayat N., Yuliadi M. Z., Manurung Y. H. P., Triyono T.

Archives of Materials Science and Engineering

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2023

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Vol. 123, nr 2

72--85

EN

Purpose: Aluminium AA5083 is commonly utilised in constructing ship hull shells, which are welded with aluminium AA6063 to act as stiffeners. However, the joints often suffer structural damage, such as longitudinal and transverse cracks in the dissimilar weld area, particularly in the Heat-Affected Zone (HAZ) of AA6063, which includes frames, brackets, and collars. To enhance the mechanical properties of AA6063, T6 heat treatment is commonly employed. The given study investigates the impact of temperature in artificial ageing during the T6 heat treatment on the microstructure and mechanical properties of the dissimilar materials welding between AA5083 and AA6063. Design/methodology/approach: The T6 heat treatment variations involve a solution treatment at 540°C for 6 hours, followed by quenching and artificial ageing at temperatures of 158°C, 200°C, and 230°C for 6 hours, followed by air cooling. The T6 heat treatment variations involve a solution treatment at 540°C for 6 hours, followed by quenching and artificial ageing at temperatures of 158°C, 200°C, and 230°C for 6 hours, followed by air. The weld joints were visually inspected and examined using radiography, then characterised by microstructure investigation and tensile and impact tests. Findings: The study's findings reveal that the T6 heat treatment significantly improves the mechanical properties of AA6063. However, the T6 heat treatment does not notably affect the mechanical properties of AA5083, the fusion line and the weld metal area. Among the artificial ageing temperature variations, the highest mechanical properties are achieved at 200°C, while the lowest mechanical properties are observed at 230°C. Research limitations/implications: Aluminium AA5083 is commonly utilised in constructing ship hull shells, which are welded with aluminium AA6063 to act as stiffeners. However, the joints often suffer structural damage, such as longitudinal and transverse cracks in the dissimilar weld area, particularly in the Heat-Affected Zone (HAZ) of AA6063, which includes frames, brackets, and collars. The paper focused on the influence of artificial ageing temperature in T6 heat treatment on the microstructure and mechanical properties of the dissimilar metals welding between AA5083 and AA6063. Originality/value: The optimum artificial ageing temperature in T6 heat treatment for the dissimilar metals welding between AA5083 and AA6063 was 200°C. The method can be applied in ship structures where AA5083 is typically utilised for constructing the hull shells, while AA6063 is employed as stiffeners.

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Parameter optimization for wire-cut electrical discharge machining of stir cast AA6063 alloy/SiC (black and green) using Taguchi method with grey relational analysis

Raj Kumar R., Prasanna Gnana, Hikku G. S.

Materials Science Poland

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2022

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Vol. 40, No. 1

68--83

EN

The present investigation aimed to determine the optimal parameters for wire-cut electrical discharge machining (WEDM) for stir cast aluminum alloy AA6063 at 850°C reinforced with 10 wt.% green SiC (SiCg) and black SiC (SiCb) particles. The WEDM machining parameters, such as pulse on time (TON), wire feed (WF) rate, and flushing pressure (FP) of the resultant stir cast AA6063/SiCb and AA6063/SiCg composites, were optimized using the Taguchi method with L9 orthogonal array to estimate the responses, such as surface roughness and metal removal rate. Further, through grey relational analysis, the finest parameters for WEDM of AA6063/SiCb and AA6063/SiCg composites were evaluated as TON = 50 μs, WF rate = 18 m/min, and FP = 3 MPa. With the optimum parameters obtained, conformational experiments were conducted, and the scanning electron microscopic images were recorded, along with the energy-dispersive X-ray (EDX) spectroscopic data of the worn surfaces and debris. From the EDX mapping images of the machined surface, it was evident that AA6063/SiCb displays a more polished surface than AA6063/SiCg. However, for applications requiring a high metal removal rate, AA6063/SiCg displays better results than AA6063/SiCb.

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Investigations on the joint properties of the friction welding of aluminium alloy tube to tube plate using an external tool

Korkmaz E., Gülsöz A., Meran C.

Journal of Achievements in Materials and Manufacturing Engineering

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2017

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Vol. 81, nr 2

70--75

EN

Purpose: Aluminium and its alloys are frequently used in structural applications due to their good welding ability as well as their high strength and corrosion resistance. Several developments have been observed on the welding of aluminium in last decade. The manufacturing of heat exchangers, economizers and boilers is highly cost progress due to tube to tube plate welding’s. The purpose of this study is investigation of friction weldability of tube to tube plate aluminium alloys using an external tools (FWTPET) which is a relatively newer solid state welding process used for joining tube to tube plate. Design/methodology/approach: First, preliminary experiments were carried out to determining suitable the tool rotational speed, pressure load and temperature. An experimental setup has been designed and manufactured to keep the pressure load constant during the preliminary tests. Then, by changing the weld mouth on the plate, the gap between the tube and the plate, and the tube projection parameters, the effects of all parameters on shear strength values, micro hardness values and the formation of internal structure of the weld zone were investigated. Findings: It was founded that aluminium tubes can successfully weld to tube plates with using an external tools. Also it is seen that vertical force between tool and sample, tube protection and temperature are very important parameters which are effect of welded joint properties. Practical implications: FWTPET which is new welding method has been used in industrial field in last few years. Originality/value: In the beginnings studies concentrate on non-ferrous metals such as Al, Cu, Mg etc. So this studies on FWTPET have remarkable importance.