TWI Digital Library

The plastic flow and microstructure of friction stir welded butt joints in aluminium alloy 7050-T7451 (Al, 6.2%Zn, 2.2%Mg, 2.3%Cu, 0.01%Zr) of thickness 7 mm were investigated. Cylindrical compression test samples (5.1 mm diameter and height) machin…

An investigation is presented into the fabrication of welded joints in high strength aluminium alloys by friction stir welding (FSW) and into the application of the technology for manufacturing lightweight aircraft structures. The materials consider…

A technique was developed to fill the exit hole during the retraction phase of a friction stir welding (FSW) sequence which, by using existing equipment functionality and designing a hollow FSW tool, syringe-type delivery system and pre-loaded alumi…

With regard to the use of friction pull plug welding to close out the termination hole associated with pin tool retraction during friction stir welding of circumferential welds in pressurised cryogenic propellant tanks, an investigation is presented…

Friction stir welding (FSW) was employed to undertake lap joining of very thin sheets (thickness 1 mm) of aluminium alloys and a structural steel using different tool geometries and a wide range of process parameters, and the microstructure and mech…

Friction stir processing (FSP) was employed to stir electroless copper coated SiC particles with a core shell structure to produce SiC/Cu particle reinforced aluminium matrix composites in the stir zone of AA 6061-T651 aluminium alloy plates with th…

Friction stir processing (FSP) was employed for grain refinement and strengthening of cast Mg, 5.9%Y, 2.6%Zn alloys and the microstructure and mechanical properties of the processed material were investigated. Specimens comprised plates (thickness 1…

In relation to the development of a friction stir welding (FSW) process to seal copper canisters for nuclear fuel waste, an investigation was undertaken into material and heat flow in FSW copper plates (thickness 50 mm) by inserting brass rods into …

A Lagrangian particle model based on the SPH (smooth particle hydrodynamics) method was developed for friction stir welding (FSW) of similar and dissimilar materials by disregarding elastic deformation and describing plastic deformation by the Johns…

AZ31 magnesium alloy sheets (thickness 4 mm) were joined by friction stir welding under process conditions with and without a heat sink, and the residual stress distribution in the joints was investigated by a hole drilling method according to the A…

Friction stir welding (FSW) was employed to fabricate butt joints in AW 5083 (Al, 4-4.9%Mg, 0.4-1%Mn) aluminium alloy plates (thickness 10 mm) and the influence of process parameters and tool geometry on the character and quality of welded joints wa…

AA 6061-T651 aluminium alloy (Al, 0.81%Mg, 0.53%Si) plates (thickness 9.5 mm) were joined by friction stir welding (FSW) and the influence of FSW tool eccentricity on material flow and welded joint mechanical properties was investigated. Welding was…

Friction stir processing (FSP) trial experiments were conducted on superplastic Zn, 21.1%Al eutectoid alloys using a modified milling machine and the results were evaluated in relation to residual microstructures, mechanical properties and damping c…

Friction stir spot welding (FSSW) experiments were undertaken on sheet specimens of similar and dissimilar combinations of AA 2024-T3 (thickness 1.27 mm), AA 2024-O (2.2 mm) and AA 7075-T6 (1.27 mm) aluminium alloys under various process conditions,…

With regard to the application of friction stir welding (FSW) of ultra thin aluminium sheets (thickness less than 1 mm) to electronic packaging and micromechanical component joining, an investigation is presented into fixturing, process parameter an…

A scanning nonlinear acoustic NDT method was employed to detect the presence of kissing bonds in a friction stir welded 2000 series aluminium alloy and experimental results were validated using coupons taken from the scan area and inspected by optic…

Precipitation hardened copper alloy sheets (thickness 2 mm) containing Cu, 0.9-1.2%Cr, 0.06-0.09%Zr were joined by friction stir welding (FSW), process parameters were optimised to realise defect-free joints, and the microstructure and mechanical pr…

An investigation is presented into the bending properties of welded joints prepared by friction stir welding (FSW) in various structural aluminium alloys during which the influence of process conditions and alloy composition (Mg, Si, Zn levels) was …

To meet the needs of lightweight automobile design to join thin steel structures to thicker aluminium sheets, two joint geometries for high-strength friction stir welding (FSW) of dissimilar and unequal thickness sheets were developed: one involving…

The deformation microstructures formed during friction stir welding (FSW) of 7075-T6 aluminium alloy (Al, 5.76%Zn, 2.46%Mg, 1.32%Cu) were studied using SEM with electron back-scattered diffraction. The sheet thickness was 1.5 mm. The alloy was evalu…