TWI Digital Library

Weld production tests were conducted using friction stir welding (FSW) and MIG processes for the production of aluminium panels. Production times were measured using a 2 m long double-skinned EN AW 6005 A-profile joint as the basic unit. Welding spe…

The thermal stability of the microstructure in the plastically deformed region of aluminium alloy friction stir welds was investigated. Alloys 6082-T6 (Al, 0.62-0.70%Mg, 0.95-1.05%Si, 0.50-0.57%Mn, 0.15-0.23%Fe) and 7108-T79 (Al, 5.20-5.70%Zn, 0.70-…

To overcome the limitations associated with conventional friction stir welding, particularly for complex shaped large structures, the bobbin tool technique was developed and demonstrated on various aluminium alloys (4-15 mm thickness range), the tec…

Annealed AISI 420 martensitic stainless steel (0.46%C, 0.3%Mn, 13.8%Cr) sheets (thickness 3 mm) were subjected to dry or wet friction stir processing (FSP) and the correlation between microstructure, hardness and process parameters was investigated.…

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…

The development of a friction stir welding tool for thermoplastics, and specifically for ABS (acrylonitrile butadiene styrene terpolymer), is described. To eliminate the voids and poor mixing which resulted when sheet ABS was welded using a tool des…

An investigation is presented into the occurrence of a grey line in x-ray diffraction of friction stir welded joints of AA 2024-T62 aluminium alloys, and its influence on mechanical and fatigue properties. Welding in 2 mm sheet was performed using a…

The use of semi-friction stir processing to improve the facing surface layer of flange joints in casings of high-voltage switchgears, filled with electro-insulating SF6 gas, was examined. The influence of tool shape and size, and welding parameters …

A detailed experimental and theoretical investigation was made of the use of friction stir welding (FSP) to modify the microstructure of magnesium AM50 die castings. Rectangular die cast plates of 3 mm thickness of AM50 (Mg, 4.9%Al, 0.39%Mn) were su…

A spot FSW robot system was developed and used to weld lap joints in aluminium alloys (used mainly in car body assembly) and the static strength of the welded joints was compared with resistance spot welded joints. A prototype spot FSW gun was combi…

With the aim of overcoming the thickness limitations of conventional friction stir welding (FSW), a multilayer multirun FSW process was developed in which six layers of ASTM A516 G70 (0.18%C, 1.1%Mn, 0.08%Cr, 0.16%Ni, 0.04%Mo, 0.02%Ti, 0.03%Al, 0.32…

A Granular Computing (GrC) Neural-Fuzzy (NF) modelling approach that can learn relational data descriptions from a minimum number of experimental data is proposed for finding optimal process operating windows in friction stir welding (FSW). Research…

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…

An investigation was undertaken to identify the main factors influencing abnormal grain growth behaviour during post weld solution heat treatment of 2219-O aluminium alloy (Al, 5.8-6.8%Cu) friction stir welded (FSW) joints. Sheet specimens (thicknes…

The floating bobbin friction stir welding (FSW) technique was employed to develop high performance aluminium floor slabs for road bridges and experiments were undertaken to investigate the influence of heat input on fracture location. Butt joints we…

An experimental investigation was conducted of the microstructure and mechanical properties of friction stir welded (FSW) aluminium alloy butt joints, with detailed analysis on the influence of the FSW process on the microhardness profile and change…

Al, 50%Si alloys were joined by friction stir welding (FSW) on spray deposited sheets (thickness 1.5 mm) for butt welding and powder metallurgy plates (thickness 10 mm) for surface welding and the welded joint surface quality and microstructure were…

The velocity field in the shear layer surrounding the tool/matrix interface in friction stir welding (FSW) was used to characterise material flow and was investigated by x-ray/computational tomography (CT) marker material experiments as well as anal…

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…