TWI Digital Library

Dissimilar lap joints between ASTM A36 low carbon steel and Inconel 625 (Ni, 21.4%Cr, 9.65%Mo, 3.2%Nb, 2.6%Fe) were fabricated by friction stir welding (FSW) and the effects of process parameters on microstructure and hardness were investigated. FSW…

A qualitative and discrete quantitative approach was adopted to develop a generalised electronic NDE (e-NDE) algorithm for identifying erratic friction stir welding (FSW) indications contained in the tool force feedback signals as low and high frequ…

With regard to the dependence of welded joint properties on tool probe shape during friction stir welding (FSW) of dissimilar butt joints between aluminium and steel, an investigation was undertaken into the interface formation mechanism by conducti…

A simplified friction stir welding (FSW) tool equipped with an adjustable probe was developed, FSW trial results with prototype tools were obtained and were analysed in terms of weldability. The simplified tools were realised by devising shoulders f…

An investigation is presented into the fatigue properties of welded joints in various structural aluminium alloys prepared by friction stir welding (FSW) and the results are compared with those measured on MIG welded joints. The experimental specime…

The tolerance of operational accuracy and optimum tool control in 3D friction stir welding (FSW) was investigated in relation to joint mechanical properties. A five-axis controlled FSW machine was developed for 3D welding. The material studied was a…

A flat heat pipe with Al2O3 nanofluid or deionised water as the working medium was designed, the relationship between pipe parameters and heat transfer characteristics was analysed, and the application of the heat pipe to friction stir welding was e…

A nonlinear dynamic model to study the axial force and torque in the tool of a friction stir welding (FSW) process was developed by training an artificial neural network (ANN) multi-perceptron layer structure with a nonlinear autoregressive exogenou…

An investigation is presented into the effect of frictional heating on joint behaviour during friction stir welding (FSW) between aluminium alloy 6063 and mild steel S45C, the cross-section microstructure of the weld interface, and the welding mecha…

The friction stir welding of dissimilar aluminium alloys for the production of aircraft structural components was investigated. Welds were made between alloys 7040 and 7449 pre-aged to obtain a defined temper after post-weld ageing. Alloy 7040 was a…

An investigation was carried out in order to examine the feasibility of producing friction stir welded FSW T-joints using the corner fillet geometry. A specific tool comprising a rotating pin (made of MP159) with a 45 degree inclination to the two p…

An experimental investigation was undertaken to examine the effect of a TIG welding torch assisted heating source on the microstructure, mechanical properties and fracture mechanism of dissimilar Cu/austenitic stainless steel butt joints fabricated …

Tensile tests, computed tomography and documentation of process forces were employed to investigate the weldability of 1.4310 austenitic stainless steel reinforced extruded AW-6060 alloy (Al, 0.35-0.6%Mg, 0.6%Si) by friction stir welding, and the re…

Following a brief overview of the state of the art and applications for FSW of aluminium and Al alloys, experience and activities with this process at TWI Ltd (UK) are introduced. Principles, advantages and applications are presented of some process…

Friction stir welding experiments were undertaken on carbon manganese steel plates (thickness 6 mm) in order to map the internal temperature distribution, assess the effects of minimal plate preparation and investigate the microstructures and mechan…

Friction stir welding (FSW) experiments were undertaken on AA 5083 aluminium alloys to investigate the influence of process parameters (rotational and travel speeds) and preheating temperature on abnormal grain growth after PWHT. The experimental sp…

The hybrid friction stir channelling (HFSC) technique was employed to produce, in one action, a channel and a joint between dissimilar thickness overlapping Al plates and dissimilar Al-Cu plates, and the microstructural and geometrical features of t…

The influence of tool geometry and process conditions on the lap shear strength, weld integrity and efficiency during friction stir spot welding of magnesium alloys for automotive applications was investigated. The macro- and microstructures and wel…

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 …

A computational fluid dynamics package, FLUENT, was used to model the viscous material flow during friction stir welding using two- and three-dimensional tool shapes. Two approaches were used to describe the viscosity. The first approach interpolate…