TWI Digital Library

The hybrid component of the combination magnesium’s lightness and aluminum’s formability should be useful for energy saving. The welding of dissimilar metallic materials is difficult for their difference in melting temperatures and the formation of …

As the development and implementation of hydrogen fuel systems gains momentum, the production of containers capable of ensuring optimal conditions for hydrogen transportation and storage has become a focal point across various industry sectors. In t…

High alloy tool steel H13, silicon nitride(Si3N4) and tungsten carbide (WC) bonded with 10%Co cylindrical pin tools (12.5 mm diameter) were evaluated for the friction stir welding of aluminium alloy 6061 containing 20 wt% alumina by determining an e…

An investigation was undertaken to evaluate friction stir processing (FSP) as a repair technique for AA 7075-T6 aluminium alloys and to examine the mechanical and fatigue performance of the repaired joints for applications such as repair of MIG and …

The joint strength of friction stir welded extruded and T6 tempered sections of 6000 series aluminium alloys (JIS 6N01, 6061, 60663 and 6082), thickness 12-20 mm, was investigated. Friction stir welding (FSW) parameters are given for one-pass and tw…

A description is presented of the development of an aircraft adapter pallet system for the rapid deployment of supplies and equipment for use by the US Army. The pallets consisted of seven lightweight AA-6005A aluminium alloy (Al, 0.4-0.7%Mg, 0.5-0.…

A coupled model, comprising a computational fluid dynamic process model, a precipitate evolution model based on classical phase transformation theory and a classical strengthening model, was formulated to investigate the effect of process parameters…

An experimental investigation was conducted into the effects of friction stir processing (FSP) and post-FSP ageing on the microstructure and mechanical properties of Alloy 718 castings. Bead-on-plate welds were fabricated on cast Alloy 718 sheets (t…

Friction stir welding (FSW) was employed to join ultra fine grained C-Mn steel (0.14%C, 0.2%Si, 1.84%Mn) sheets of 5 mm thickness using a polycrystalline cubic boron nitride tool, and the metallurgical and mechanical properties of the joint were eva…

Weld initiation experiments were undertaken on various Al-Mg(-Si) alloy extrusions to develop fixed-gap bobbin tool designs and process procedures to facilitate friction stir welding (FSW) of sheet specimens as thin as 3 mm. The alloy grades studied…

A multi-physics model for thermal simulation of bobbin-tool friction stir welding was developed assuming a partially sticking condition at the tool-matrix interface, and simulation results were compared with experimental data for welding of AA7449 a…

The degradation mechanisms of friction stir welding (FSW) tools made of three tungsten alloys were investigated. Tools were made from 99%W-1%La2O3, 75%W-25%Re and 70%W-20%Re-10%HfC. These were used to make friction stir welds in high strength steel …

An experimental investigation was conducted to examine weldability, material thickness, welding speed and joint geometry aspects of robotic friction stir welding (FSW) of aluminium alloy aircraft structures. An ABB IRB7600-500 serial design robot wa…

An investigation was undertaken to examine the effect of adding aluminium to magnesium on the strength of dissimilar joints between steel and magnesium fabricated by friction stir welding. The materials studied were pure 3N magnesium, AZ31 (Mg, 2.9%…

Friction stir processing (FSP) experiments were undertaken on annealed AISI 420 stainless steel plates (thickness 6 mm) in order to compare three methods for assessing tool wear. The investigations incorporated two tool compositions (WC-Co or polycr…

Friction stir welding (FSW) experiments were performed to join two dissimilar aluminium alloys, AA-7075 (Al, 5.58%Zn, 2.48%Mg, 1.38%Cu) and AA-2024 (Al, 4.5%Cu, 1.36%Mg), in a butt configuration, and the microstructural and hardness characteristics …

The viscoplastic behaviour of two aluminium alloys (non heat-treatable AA5083-H111 and heat-treatable AA6082-T6) was analysed by performing tensile tests at different temperatures and strain rates and the friction stir weldability of the materials i…

Friction stir welding of aluminium alloy JIS-6N01-T5 (Al, 0.4-0.8%Mg, 0.4-0.9%Si) was investigated for subway [underground railway] rolling stock applications by comparing the welded joint properties with those of MIG and laser welded joints. Sheet …

Friction stir welding (FSW) was employed to weld Mo and Ti sheets (thickness 1.5 and 2 mm, respectively), the effects of process conditions on weldability as well as mechanical properties and microstructure of joints was investigated, and the import…

Friction stir processing (FSP) was employed to fabricate oxide dispersion strengthened copper-based composite plates with a graded microstructure and evolving mechanical, thermal, electrical and wear properties along their thickness. Specimens compr…