TWI Digital Library

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…

An investigation is presented into pore formation and grain growth in aluminium alloys during TIG welding after friction stir welding (FSW), for reasons of repair or fabrication, and into two methods to suppress these problems. The material studied …

Friction stir welding (FSW) studies were undertaken to join sheet and plate specimens of aluminium alloys in a butt joint configuration, and design of experiments methods were employed to optimise process parameters with respect to weldment quality …

Controlled force monitored plug-in tests were undertaken to investigate the influence of rotational speed and to analyse flow regimes during friction stir welding (FSW) of different aluminium alloys. Experimental specimens comprised sheets (thicknes…

An investigation was undertaken into the development and wear performance of friction stir welding (FSW) tools made from precipitation strengthened Ir-containing nickel-based superalloys (Ni, 25%Ir, 14%W, 4%Al) during FSW of Ti, 6%Al, 4%V alloys. Th…

A procedure has been developed for repairing welds made by friction stir welding (FSW) in cases where the tool breaks during welding. It involves the following stages: excavating the broken FSW tool, milling out a slot across the hole, machining an …

With regard to the need to control process temperature in friction stir welding to enhance process stability and weldment mechanical properties, a feedforward feedback control system was designed based on two nonlinear single input single output (SI…

Defect free welded joints were fabricated in 5083-O aluminium alloy (Al, 4.3%Mg, 0.65%Mn) plates (thickness 20 mm) by friction stir welding (FSW) and the influence of tool geometrical features on their microstructures and structure properties relati…

A computational fluid dynamics code ("CosmosFlow") was employed to evaluate the temperature distribution in materials during friction stir welding (FSW). Thermal simulations based on finite element models were undertaken to predict the optimum ratio…

Friction stir spot welding (FSSW) was performed on dual phase 800 high strength automotive steel (0.14%C, 0.23%Si, 1.52%Mn) to establish the effect of tool rotation speed (750-2400 rpm) for a number of weld cycles featuring different Z-axis plunge r…

In relation to the application of tailor welded blanks of aluminium alloys to the vehicle weight reduction process, an investigation is presented into the precipitation sequence in friction stir welded 6016 alloy sheets (thickness 2 mm) during a pai…

With regard to the application of friction stir welding (FSW) to the production of launcher tanks holding cryogenic liquids, an investigation was undertaken to establish a robust and industrialised FSW process for AA 2219 alloys in T87 and T851 cond…

A round robin investigation was made to determine if defects found using the non-destructive evaluation (NDE) techniques of ultrasonic phased array and x-ray inspection, can be identified by a real-time, feedback-based friction stir weld analysis to…

A modified friction stir lap welding process was developed to encase uranium alloy foil in an aluminium jacket and results were compared with two other bonding methods for fabricating monolithic fuel plates, namely hot isostatic pressing and transie…

Experimental measurements and finite element modelling were undertaken to investigate the deposition of AA1050 commercially pure aluminium layers on AA 2024-T351 aluminium alloy substrates by friction surface cladding (FSC). Experiments were perform…

Experimental measurements and finite element modelling were undertaken to investigate the deposition of AA1050 commercially pure aluminium layers on AA 2024-T351 aluminium alloy substrates by friction surface cladding (FSC). Experiments were perform…

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…

Process force and discontinuity models were derived to estimate the forces observed in friction stir welding (FSW) in order to develop a method of detecting discontinuities during FSW using physics-based process modelling. FSW welded joints with and…

Numerical modelling and experimental measurements were undertaken to investigate the extension and microstructure of the HAZ during friction stir welding (FSW) of 7075 aluminium alloy (Al, 5.86%Zn, 2.37%Mg, 1.91%Cu) thin sheets (thickness 1.2 mm). W…