Fabrication of 2000 Series Aluminum Alloy Lap Joint Sheets by Magnetic Pulse Welding and Their Interfacial Microstructure Observations

Abstract

Lap joint sheets of 2017-T3/2017-T3 and 2024-T3/2024-T3 were fabricated by magnetic pulse welding (MPW). Tensile shear tests were performed on the welded sheet, and a good lap joint was achieved at a discharge energy more than 3.0 kJ for both lap joint sheets. Weld interface showed wavy morphology when bonding at an adequate amount of discharge energy. Weld width of the lap joint sheets tend to increase with increasing of discharge energy. Collision speed calculated based on collision time was 211 m/s and estimated 1.5 GPa of the collision pressure at discharge energy of 3.5 kJ. SEM and EDS results showed that the weld interface exhibited no signi cant contrast of intermediate layer and oxides. A Metal jet was observed as aggregates of ne particles with size of less than 100 nm at the outside of bonded area. From TEM observation at the bonding interface, Al phases between yer and parent sheets had direct contact without the intervention of the oxide, and localized melting was not recognized. From these obtained results, good lap joint is attributed to true-contact of Al phases, an increasing of weld width, the anchor effect, and work hardening at weld interface.

Microstructure and Joint Strength of Magnetic Pulse Welded Aluminum/Aluminum-Coated Steel Joint

“…23) Furthermore, dissimilar Al alloy joints have also the sinusoidal wavy interface. 4,24,25) In this study, since welding of A1050 and Alcoated steel was performed, the metals which sandwich the welding interface are A1050 and Al coating (AlSi alloy). Therefore, formation of the sinusoidal wavy interface was expected but it appears that the ridge parts of the interface were crushed (Fig.…”

Wire-arc additive manufactured Al–Cu alloy: Microstructure, mechanical properties and their anisotropy

“…Typically, 2000 series aluminium alloys are among the commonly used aluminium alloys in the WAAM process [13][14][15] due to the characteristics of high specific strength, light weight and excellent heat resistance [16,17]. Typical alloys of 2219, 2024, 2324 and 2524 were widely used in high temperature resistant parts of aerospace [18][19][20][21][22][23][24][25]. The mechanical properties of Al-Cu alloys fabricated by WAAM have always been the focus of attention, and relevant researches mainly focus on printing parameters and heat treatment.…”