Experimental investigation of longitudinal and transverse welds during sideways extrusion. Issue 1 (1st December 2022)

• Record Type: Journal Article
• Authors: Lu, X; Yu, J; Yardley, V A; Wu, Z; Liu, H; Shi, Z; Lin, J
• Is Part Of: IOP conference series. Volume 1270:Issue 1(2022)
• Publication Date: 2022-12-01
• Subjects: differential velocity sideways extrusion -- weld seam -- welding quality -- aluminium alloy; Materials science -- Periodicals; 620.1105
• DOI: 10.1088/1757-899X/1270/1/012091
• Languages: English
• ISSNs: 1757-8981

Abstract

Abstract : Differential velocity sideways extrusion (DVSE) is a novel process for fabricating curved profiles; welding quality during extrusion is an important issue for its industrial application. In this study, solid bars of aluminium alloy AA1070 were extruded from multiple billets at 500 °C using the novel process and the microstructure and mechanical properties of the extrudate were investigated. The weld formed between the billets includes longitudinal and transverse solid-state weld regions formed as the metal was extruded. The longitudinal welds have better mechanical properties than the transverse welds. Dynamic recrystallisation (DRX) occurred in areas with high dislocation density during the extrusion process and as a result, grains across the bonding interfaces of longitudinal welds have been formed, which improves the weld quality. In the areas with the transverse welds, macro weld defects can be observed at the weld front. With further progress of sideways extrusion, the defect density reduced and new grains formed at the bonding surface.