scholarly journals Potential Applications of Friction Stir Welding to the Hydrogen Economy. Hydrogen Regional Infrastructure Program In Pennsylvania, Materials Task

2009 ◽  
Author(s):  
Jennifer Brendlinger
Keyword(s):  
Friction Stir Welding ◽  
Hydrogen Economy ◽  
Friction Stir ◽  
Potential Applications ◽  
Infrastructure Program

Initial Investigation on Joining ODS Alloy Using Friction Stir Welding for Gen IV Nuclear Reactor Heat Exchanger Applications

2007 ◽  
Author(s):  
Zhili Feng ◽  
Weiju Ren
Keyword(s):  
Heat Exchanger ◽  
Friction Stir Welding ◽  
Nuclear Reactor ◽  
Oxide Dispersion Strengthened ◽  
High Temperature Strength ◽  
Butt Weld ◽  
Friction Stir ◽  
Potential Applications ◽  
Gen Iv ◽  
Ods Alloy

To investigate the possibility of joining oxide-dispersion-strengthened (ODS) alloys while preserving the dispersion for high temperature strength in potential applications to Gen IV nuclear reactor compact heat exchanger, solid-state welding of ODS alloy sheets using friction stir welding (FSW) was studied. Butt weld was successfully produced, and the weld and base metals were characterized using optical, scanning electronic, and transmission electronic microscopes, as well as energy dispersion x-ray spectrum. Microhardness mapping was also conducted over the weld region. Analyses indicate that the distribution of the strengthening oxides was preserved in the weld. Decrease in microhardness of the weld was observed but was insignificant. The preliminary results seem to confirm the envisioned feasibility of FSW application to ODS alloy joining. Further investigation activities are suggested for providing better mechanistic understanding and processing control for applications to Gen IV nuclear reactor systems.

Numerical Analysis of Multi-Field Coupled Phenomena in Friction Stir Welding and Applications

2014 ◽  
Vol 783-786 ◽  
pp. 1794-1807
Author(s):  
Qing Yu Shi ◽  
Gao Qiang Chen ◽  
Xi Bo Wang ◽  
Xu Kang
Keyword(s):  
Numerical Simulation ◽  
Friction Stir Welding ◽  
Heat Generation ◽  
Material Flow ◽  
Metal Flow ◽  
Friction Stir ◽  
Rate Dependent ◽  
Potential Applications ◽  
Complex Phenomena ◽  
Fsw Parameters

Friction stir welding (FSW) is an advanced solid state joining technology, which was invented by TWI in 1991. During the process, large amount of heat is generated due to the friction between the tool and the material. As a result, the metal around the tool is softened as the temperature rises, and significant plastic flow occurs. So FSW is a complex process with multi-field coupled phenomena. Material flow plays a central role in FSW. But it is still difficult to reveal the material flow regime and joining mechanism during FSW process. Numerical simulation is a powerful tool for investigating the metal-flow-related complex phenomena during FSW. Meanwhile, numerical simulation could also help to optimize FSW tool design and FSW parameters. In this paper, we review the recent development in simulation of material flow during FSW. Then, the important issues in modeling multi field coupled phenomena during FSW are summarized, which include the heat generation mechanism, the temperature and strain rate dependent material’s behavior, and the interaction between tool and material. Finally, a comprehensive simulation model is presented, which enables advanced study on the coupled phenomena of heat generation, temperature distribution, material flow, and defects formation. This model has shown potential applications in simulating the relation between the transport of material and the macrostructure formation or defects formation. In spite of these progresses, simulation of material flow during FSW still need quite a lot of researches to fulfill industry requirement.

A Review on the Fabrication of In Situ Metal Matrix Composite during Friction Stir Welding

2020 ◽  
Vol 978 ◽  
pp. 191-201
Author(s):  
Abhishek Sharma ◽  
Jinu Paul
Keyword(s):  
Friction Stir Welding ◽  
Surface Properties ◽  
Surface Hardness ◽  
Weld Strength ◽  
New Materials ◽  
Related Factors ◽  
Friction Stir ◽  
Composite Fabrication ◽  
Potential Applications

In recent years, increasing weld strength along with improved surface properties of the joint during friction stir welding (FSW) has gained noteworthy attention due to increasing applications concerning higher wear resistance and strength related factors. Accordingly, the exploration endures for new materials and ways which will probably increase weld strength along with imparting various improved surface properties to the weld. In spite of several modifications on FSW, its in-situ composite fabrication potential remains quite unfamiliar. In this study, we make available an up to date review of recent in-situ fabricated composites during FSW by using various reinforcements. In particular, the effect of various reinforcements and methodology on the weld strength and surface hardness is reported systematically. Moreover, the strengthening mechanisms accountable for the improvement in weld propeties have been reviewed, and the new potential applications of this new welding strategy are envisaged.

Microstructural and Mechanical Behaviour Evaluation of Mg-Al-Zn Alloy Friction Stir Welded Joint

2020 ◽  
Vol 17 (3) ◽  
pp. 8150-8159
Author(s):  
Kulwant Singh ◽  
Gurbhinder Singh ◽  
Harmeet Singh
Keyword(s):  
Heat Treatment ◽  
Friction Stir Welding ◽  
Magnesium Alloys ◽  
Mechanical Performance ◽  
Fuel Efficiency ◽  
Research Work ◽  
Grain Structure ◽  
Tensile Fracture ◽  
Friction Stir ◽  
The Impact

The weight reduction concept is most effective to reduce the emissions of greenhouse gases from vehicles, which also improves fuel efficiency. Amongst lightweight materials, magnesium alloys are attractive to the automotive sector as a structural material. Welding feasibility of magnesium alloys acts as an influential role in its usage for lightweight prospects. Friction stir welding (FSW) is an appropriate technique as compared to other welding techniques to join magnesium alloys. Field of friction stir welding is emerging in the current scenario. The friction stir welding technique has been selected to weld AZ91 magnesium alloys in the current research work. The microstructure and mechanical characteristics of the produced FSW butt joints have been investigated. Further, the influence of post welding heat treatment (at 260 °C for 1 h) on these properties has also been examined. Post welding heat treatment (PWHT) resulted in the improvement of the grain structure of weld zones which affected the mechanical performance of the joints. After heat treatment, the tensile strength and elongation of the joint increased by 12.6 % and 31.9 % respectively. It is proven that after PWHT, the microhardness of the stir zone reduced and a comparatively smoothened microhardness profile of the FSW joint obtained. No considerable variation in the location of the tensile fracture was witnessed after PWHT. The results show that the impact toughness of the weld joints further decreases after post welding heat treatment.

Friction stir welding

2010 ◽  
Author(s):  
Daniela Lohwasser ◽  
Zhan Chen
Keyword(s):  
Friction Stir Welding ◽  
Friction Stir
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