TWI Digital Library

In relation to the implementation of friction stir welding (FSW) for stringer-skin type lap joint fabrication in aeronautical applications, an investigation is presented into the overlap welding of an extruded profile AA 7050-T7651 aluminium alloy s…

Friction stir welding (FSW) was employed to fabricate hybrid joints between wrought AA 5454 aluminium alloys and AZ 91 die cast magnesium alloys, and the weldability, microstructure, mechanical properties, corrosion and fracture behaviour of the wel…

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…

Friction stir welding (FSW) experiments were undertaken on 4142 low alloy and S7 tool steels as well as dissimilar steel combinations and the microstructure and mechanical properties of the welded joints were investigated. FSW was conducted using an…

With regard to the development of 9%Ni steels for cryogenic applications, an investigation was undertaken into the metallurgical weldability of ASTM A553 Type I steel (0.08%C, 0.73%Mn, 9.4%Ni) joined by double-sided two-run friction stir welding (FS…

The influence of pin length and insulating anvil material on friction stir spot welding (FSSW) of thin (0.9 mm) 6111-T4 aluminium (Al, 0.73%Si, 0.65%Mg, 0.96%Cu, 0.3%Mn, 0.2%Fe) was investigated. Welds were made varying the length of the tool pin (1…

A slide style presentation giving a market review of FSW, challenges for FSW users and process enhancements. The development of equipment and methods for floating bobbin tool FSW and stationary shoulder friction stir welding is outlined. Lifetimes o…

Conventional friction stir welding (FSW), hybrid FSW and thermal stir welding were evaluated and compared for the joining of a nickel-based superalloy Haynes 230. Welds were made in Haynes 230 NiCrW alloy (20-24%Cr, 13-15%W, 6.4 mm thickness), an in…

The friction stir spot welding (FSSW) technique was employed to weld low carbon steel, Invar and iron meteorite materials and the microstructure and mechanical properties of the welded joints were compared. FSSW experiments were performed on low car…

To investigate the potential of mechanical tensioning (MT) to reduce residual stresses in friction stir welding (FSW), thereby eliminating buckling, FSW was performed on 2024-T351 aluminium alloy (thickness 3.2 mm) with different tensile stress leve…

With regard to the problem of parameter development for friction stir welding (FSW) of workpieces with 3D joints, a self-tuning algorithm is presented based on the tool-workpiece thermocouple (TWT) method for temperature measurement to facilitate th…

Similar and dissimilar friction stir welds (FSW) were performed between 2014-T6 and 6061-T6 aluminium alloy sheet (4.70 mm thickness). Weld speed of 450 and 90 mm per minute were used to produce welds described as cold and hot welds respectively. Ad…

Friction stir spot welding (FSSW) experiments were undertaken to fabricate dissimilar metal joints between aluminium and light metals such as magnesium and titanium, and the microstructure and mechanical properties of the weldments were investigated…

Tapered probe and parallel probe tools were employed in friction stir welding of thick section AA 6082-T6 aluminium alloy specimens (thickness 38 mm) and the effect of tool geometry on weldment microstructure and crystallographic texture was investi…

Friction stir welding (FSW) experiments were undertaken on commercially pure Ti and Ti-6%Al-4%V plates (thickness 6 mm) by incorporating nickel foil markers of varying thicknesses to reduce forging load, enhance surface finish, eliminate void format…

Friction stir spot welding experiments were conducted on dissimilar metal joints between AA5052 aluminium alloy and two kinds of steel (980 MPa high tensile strength steel and 270 MPa mild steel), and the microstructure and mechanical properties of …

Rotary friction welding was employed to fabricate joints between an ASTM A36 steel pipe (0.11%C, 0.2%Si, 0.92%Mn, 0.02%Cr, 0.02%Nb, 0.03%Al) and an API 6A flange and microstructural analyses and mechanical tests were undertaken to investigate the se…

5A06 aluminium alloy (Al, 6.8%Mg, 0.5%Mn) sheets (thickness 5.17 mm) were joined by friction stir welding (FSW) and the microstructure and mechanical properties of the welded joints were investigated. Welding was performed using a tool pin with a sc…

A friction stir welding (FSW) procedure using a W-Re alloy tool, magnetic welding fixture and a high-speed steel backing bar was developed for application to precipitation-hardened martensitic stainless steel (13.7%Cr, 7.1%Ni) thin sheet (thickness …

Friction stir welding (FSW) experiments were undertaken on commercially pure titanium and Ti, 6%Al, 4%V alloy sheets (thickness 1.2 and 1.25 mm, respectively), the microstructure of the weldments was examined and the wear mechanisms of the welding t…