TWI Digital Library

Friction stir welding (FSW) experiments were conducted on magnesium alloys, wrought AZ31 (Mg, 3%Al, 1%Zn) and cast AZ91 (Mg, 9%Al, 0.6%Zn), to investigate the effect of process conditions on microstructure and hardness. Welding was performed at rota…

Butt joints were fabricated in sheet specimens of 2017A-T451 alloys (Al, 4.14%Cu) and cast plates of Al, 8.6%Si, 0.31%Mg by friction stir welding (FSW) and their microstructure and mechanical properties were investigated. Welding experiments were co…

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…

The microstructure of joints produced between dissimilar Al alloys by friction stir welding (FSW) was studied. FSW was performed for joining of 5083/6061 Al alloy workpieces of 5 mm thickness using a rotation speed of 1800 rpm and a welding speed of…

Based on the hypothesis that uniform friction stir weld quality can be produced by maintaining a constant weld zone temperature, an investigation was conducted to develop a feedback strategy and a closed-loop control algorithm to maintain constant t…

Tensile testing was used to characterise and compare the fracture locations and their influencing factors for a number of friction stir welded aluminium materials (AA-1050, AA-2017, AA-6061). Friction stir welding was carried out on sheets of thickn…

A report is presented into the challenges faced when developing thermal, thermomechanical and flow models of the friction stir welding process, such as the evolution of predictive models, a method to find the correct contact state variable, and the …

A control concept for friction stir welding (FSW) of structural steels was developed based on a closed loop architecture that limits the heat input during the welding process according to the continuously monitored value of the magnetic permeability…

The microstructure, mechanical properties and fatigue behaviour of friction stir welded (FSW) and MIG welded butt joints in aluminium alloy 2519-T87 (Al, 5.3-6.4%Cu, 0.1-0.5%Mn, 0.02-0.1%Ti) plate of 25.4 mm thickness were compared. Friction stir we…

A review is presented of the state-of-the-art of industrial friction stir welding (FSW) mass production, current trends, challenges and market demands as well as the potential of high speed complex contour welding on multi-axis FSW machinery with re…

In order to understand the complex interactions between deformation, recrystallisation and precipitation induced during friction stir welding, two aluminium alloys were studied: a work hardened 5251-O alloy (Al, 2.2%Mg) and a precipitation hardened …

The friction stir welding of lap joints of aluminium alloy 6061 sheet of 3 mm thickness was monitored using a variety of sensors, to establish systems for weld quality control. A triaxial dynamometer measured the forces on the workpiece in three per…

The effects of friction stir welding (FSW) on the corrosion resistance of aluminium alloys 2014A and 7075, both welded in the peak aged T651 condition, were studied. The effects of postweld heat treatment (retrogression and reageing treatment) were …

Physical simulations were undertaken on cylindrical specimens of 304L stainless steel using a "Gleeble 1500" thermomechanical simulator in the form of hot axial compression tests so that the material underwent similar heating and cooling profiles to…

The microstructure and postweld heat treatment of friction stir welds in age hardening aluminium alloys were investigated. Aluminium alloy plate (2014-T6 and 7075-T6 and -T651) of thickness 6.35 mm (0.25 in) was friction stir welded and the joints s…

An adjustable tool was employed during friction stir welding (FSW) of A1050 pure aluminium sheets (thickness 5 mm) and the effects of the tool shoulder and probe on the stir zone shape and defect formation were investigated by changing the rotationa…

Friction stir processing (FSP) was employed to repair casting defects such as shrinkage cavities and porosity in nickel aluminium bronze, and the corrosion behaviour of the processed material was examined through short-term and long-term testing and…

An experimental study of friction stir welding (FSW) to join 2017A-T6 with 7075-T6 and 6013 aluminium alloys, by applying different welding parameters and conditions, was performed with the aim of analysing the microstructures and properties of the …

The microstructure, hardness, indentation profile, tensile strength, fracture cracking and grain boundaries of friction stir overlap welds in 2124 aerospace aluminium alloy were investigated. Welds were made in EN AW-2124 heat-treatable wrought AlCu…

Welded joints were fabricated in AZ31 magnesium alloy (Mg, 3.01%Al, 0.9%Zn, 0.5%Mn) sheets (thickness 2 mm) by bobbin tool friction stir welding (BTFSW) and the influence of process parameters (rotational and welding speeds) on their microstructure …