TWI Digital Library

Friction stir welding (FSW) experiments were conducted on commercially pure titanium sheet (thickness 3 mm) to identify the optimum tool material and process conditions; the microstructure and mechanical properties of the welded joints were determin…

An experimental study was made of the effect of friction stir processing (FSP) and the influence of process parameters on the microstructure and mechanical properties of cast magnesium AZ91 alloy. FSP tests were conducted on die cast plates of 4 mm …

Dissimilar lap joints were fabricated between 6022 aluminium alloy and SPCC low carbon steel using friction stir welding (FSW) and the effect of probe tip position on microstructure and mechanical properties was investigated. FSW was performed at a …

The electrically assisted friction stir welding (EAFSW) technique, in which an electric current is fed through the workpiece to soften the metal by means of ohmic heating, is described and some trial experimental results are reported. The initial EA…

With regard to the application of wear resistant surface layers on chosen substrates, an investigation is presented into the deposition of cermet (WC, 10%Co, 4%Cr or Cr3C2-NiCr) and oxide (Al2O3) coatings onto AA 5083 aluminium alloy substrates by c…

A review is presented of the development of W, 25%Re friction stir welding (FSW) tool materials for application to steels and hard metals, such as titanium and nickel-based superalloys. Issues discussed include: the DUST (dual use science and techno…

Based on lessons learned from the MegaStir research programme devoted to friction stir welding (FSW) of high temperature alloys and with the aim of producing high quality, defect free welded joints while maximising tool life, a report is presented i…

Friction stir welding (FSW) experiments were conducted on a variety of materials and grain structure development, material flow characteristics and crystallographic texture formation were examined by high-resolution electron backscatter diffraction.…

A numerical model based on the finite element method and axisymmetric thermo-elastic-plastic analysis was developed to describe the refill friction stir spot welding (RFSSW) process and to predict the temperature distribution in welded joints as a f…

Friction stir welding (FSW) experiments were undertaken on pure aluminium (A1050) sheets (thickness 5 mm), and the material flow during welding was visualised in 3D by x-ray radiography using a tiny spherical tungsten tracer. FSW was performed in po…

Neutron and synchrotron x-ray diffraction techniques were employed to determine the effect of global mechanical tensioning on residual stress in friction stir welded joints fabricated in AA 2199-T8 (Al, 2.63%Cu, 1.56%Li) and AA 7449-W51 (Al, 7.5-8.7…

A fully coupled thermomechanical formulation was proposed for the numerical modelling of friction stir welding (FSW) to facilitate the efficient simulation of different types of material flows and accurate computation of the resulting thermomechanic…

With regard to the capability of ultrasonic vibration enhanced friction stir welding (UVeFSW) to improve weld formation quality as well as the microstructure and mechanical properties of the welded joints, experiments were undertaken to clarify the …

The friction stir welding (FSW) process was determined for stiffener to skin lap joints of different aluminium alloys (similar 2024 T3, similar 2139 T3 and T8, dissimilar PA 765 T79 extrusion on 2139 T8 skin) and FSW procedures with retractable pin …

Square butt welds of AA 7075-T6 sheet (thickness 1.3 or 3.2 mm) to AA 7075-T6 extrusions were fabricated by friction stir welding (FSW) procedures incorporating the controlled introduction of defects, and the impact of the defects on joint mechanica…

To assess the feasibility of friction stir welding of Ti-6Al-4V alloy (thickness 5 mm), appropriate pin tool material and processing parameters were determined, thermal and environmental management systems were tested, and both A- and B-basis design…

Two 3D numerical simulation models were employed to investigate the relationship between forces and torques during high-speed friction stir welding (FSW) with respect to mechanistic defect development owing to process parameter variations, and the t…

A friction stir welding (FSW) methodology, incorporating Taguchi quality engineering to optimise process parameters, was developed to fabricate a cold plate consisting of copper pipe embedded in the machined groove of a 6061 aluminium alloy base pla…

An investigation is presented into the use of temperature control in two friction stir welding (FSW) research projects: to understand the effect of backing plate conductivity on process parameters and to study the influence of active FSW tool coolin…

In relation to the development of corrosion barrier capsules for spent nuclear fuel disposal, friction stir welding experiments were conducted on oxygen-free copper plate specimens (thickness 20 mm) using different joint preparation, shielding gas a…