TWI Digital Library

A two-step modelling procedure, consisting of a thermo-fluid model and a thermo-mechanical model, was employed to predict temperature, flow and residual stress fields around the workpiece block, steel backing plate and tool in friction stir welding …

The application of suitable friction stir welding (FSW) tools and procedures to common structural geometries in industry, with emphasis of FSW of hard metals including steel, titanium and nickel based alloys in butt, T-joint, corner joint and circum…

An experimental investigation is presented into the fatigue properties of welded joints made by friction stir welding (FSW) of 2024-T4 (Al, 4.4%Cu, 0.6%Mn, 1.5%Mg) and 2014-T6 (Al, 4.5%Cu, 0.8%Mn, 0.5%Mg) aircraft alloys and their dependence on proc…

Extruded AZ31 (Mg, 3%Al, 1%Zn) alloy plates (thickness 6 mm) were joined by one-run or two-run friction stir welding (FSW) and the microstructure, mechanical properties and residual stress characteristics of the welded joints were investigated. FSW …

Friction stir welding experiments were undertaken on Ti-6%Al-4%V sheets (thickness 2 mm) in order to investigate the influence of process conditions on stir zone microstructure and local texture. Welding was performed at rotational speeds of 225-300…

A hybrid welding system called ultrasound supported friction stir welding was developed to mitigate the strength reducing effects of brittle intermetallic phase layers and was applied to the fabrication of dissimilar joints between wrought aluminium…

An experimental investigation was undertaken to examine how tool pin induced material flow and intermetallic growth conditions affect the formation of discontinuity during friction stir lap welding of dissimilar Al-Cu joints. The materials comprised…

An economic analysis was undertaken to compare the costs of onshore and offshore pipeline construction scenarios for welds made using friction stir welding (FSW) and conventional mechanised MIG/MAG welding. Pipe diameters of 1067 and 305 mm were sel…

Models to predict the precipitate and grain size evolution in AA7449 aluminium alloy friction stir welds are presented and compared with experimental data. Bead on plate welds on 3.2 mm thickness sheets of composition Al, 8.4%Zn, 2.1%Mg, 1.8%Cu were…

With regard to the occurrence of residual oxide defects associated with friction stir welding (FSW) of aluminium alloys, an investigation is presented into a possible alternative mechanism for oxide formation within the weld nugget involving enhance…

This study addresses the challenges of predicting joint efficiency for friction stir welding (FSW). It adopts a data driven approach, leveraging data analytics to develop accurate predictive models. A database of 1780 records from diverse aluminium …

In this study, the improvement of process stability of bobbin tool FSW for long welding length was studied. The base material used in this study was 18mm thickness 5083-O Al alloy. Floating bobbin type tools were used in this study. FSW produced def…

Bobbin-tool friction stir welding (BT-FSW) is a variant process of conventional friction stir welding with a particular tool configuration composed of an additional lower shoulder, enabling additional heat input and complete penetration of the pin. …

3-point fatigue bending tests and finite element method simulations were employed to study the fatigue performance of combined lap-butt joints fabricated by friction stir welding in 6005A-T6 alloy (Al, 0.61%Si, 0.54%Mg) extruded profiles for railway…

Dissimilar overlap joints between different aluminium alloys were fabricated by friction stir welding (FSW) and the influence of alloy composition and FSW tool type on fatigue fracture, microstructure and mechanical properties was investigated. The …

Several kinds of Co-based alloys with different mechanical properties (e.g. high temperature strength, hardness, wear resistance and gamma-solvus temperature) were designed for friction stir welding (FSW) tool applications by varying chemical compos…

Orientation imaging microscopy was employed to characterise the stir zone microstructure in relation to the defect formation tendency and evaluate the peak temperature at different locations in friction stir welded Ti-6%Al-4%V specimens. Welded join…

Flame resistant AZX 612 (Mg, 6%Al, 1%Zn, 2%Ca) magnesium alloy joints were fabricated by asymmetric double sided friction stir welding (FSW) and the influence of tool rotational speed on their microstructure and mechanical properties was investigate…

The effects of friction stir welding (FSW) tool geometry on material flow during the welding of 4 mm aluminium alloys 2024-T51 and 6056-T4 were investigated. Welds were made using three different welding tool pins (conical non-threaded profile, coni…

The relationship between microstructure and properties in friction stir welding was studied. The effects of grain size, particle size and distribution, and dislocation density on weld strength in friction stir welds in work-hardenable Al alloy AA 52…