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ETD
  • All fields: FSW
(20 results)



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    • A Finite Element Simulation of Temperature and Material Flow in Fricton Stir Welding

    • Lasley, Mark J 1978-

    • The purpose of this research was to use the Transvalor S.A. product, Forge3, to develop a finite element simulation of the friction stir welding process that improves the predictability of temperature evolution and material flow within the...

    • ETD



    • A Torque Based Power Input Model for Friction Stir Welding

    • Pew, Jefferson W 1978-

    • For decades models have been developed for predicting the size of the weld nugget and heat affected zones in fusion welded structures. The basis for these models is the welding heat input, which is fairly well understood for most arc welding...
    • ETD



    • An Analysis of Microstructure and Corrosion Resistance in Underwater Friction Stir Welded 304L Stainless Steel

    • Clark, Tad Dee 1977-

    • An effective procedure and parameter window was developed for underwater friction stir welding (UWFSW) 304L stainless steel with a PCBN tool. UWFSW produced statistically significant: increases in yield strengths, decreases in percent...
    • ETD



    • An Evaluation of Constitutive Laws and their Ability to Predict Flow Stress over Large Variations in Temperature, Strain, and Strain Rate Characteristic of Friction Stir Welding

    • Kuykendall, Katherine Lynn

    • Constitutive laws commonly used to model friction stir welding have been evaluated, both qualitatively and quantitatively, and a new application of a constitutive law which can be extended to materials commonly used in FSW is presented. Existing...
    • ETD



    • Analytical Thermal Model of Friction Stir Welding with Spatially Distributed Heat Source

    • Reese, Gordon Scott

    • Friction stir welding (FSW) has been studied extensively for the past two decades. Thermal modeling has been of particular interest, as the quality of the weld is dependent upon the temperature history of the work piece during the process. Since...
    • ETD



    • Characterizing the Frictional Interface in Friction Stir Welding

    • Stratton, Daryl A 1979-

    • Quantitative understanding of frictional phenomena between the tool and the workpiece is essential for accurate modeling of the Friction Stir Welding (FSW) process. Two methods of measuring the tool-workpiece interface are proposed that allow...
    • ETD



    • Development and Characterization of Friction Bit Joining: A New Solid State Spot Joining Technology Applied to Dissimilar Al/Steel Joints

    • Siemssen, Brandon Raymond 1984-

    • Friction bit joining (FBJ) is a new solid-state spot joining technology developed in cooperation between Brigham Young University of Provo Utah, and MegaStir Technologies of West Bountiful Utah. Although capable of joining several different...
    • ETD



    • Effects of Friction Stir Welding on Polymer Microstructure

    • Strand, Seth R 1974-

    • This work establishes the relationships between several key Friction Stir Welding process parameters and the resulting microstructural and flexural properties of the welded joint. A series of four single parameter experiments were run. The...

    • ETD



    • Experimental and Numerical Investigation of Tool Heating During Friction Stir Welding

    • Covington, Joshua L 1976-

    • The heat input to the tool has been investigated for friction stir welding (FSW) of aluminum alloy AL 7075-T7351 over a wide range of process operating parameters using a combined experimental/numerical approach. In a statistical Design of...
    • ETD



    • Friction Stir Welding of High-Strength Automotive Steel

    • Olsen, Eric Michael 1979-

    • The following thesis is a study on the ability to create acceptable welds in thin-plate, ultra-high-strength steels (UHSS) by way of friction stir welding (FSW). Steels are welded together to create tailor-welded blanks (TWB) for use in the...
    • ETD



    • Investigate Correlations of Microstructures, Mechanical Properties and FSW Process Variables in Friction Stir Welded High Strength Low Alloy 65 Steel

    • Wei, Lingyun 1972-

    • The present study focuses on developing a relationship between process variables, mechanical properties and post weld microstructure in Friction Stir Welded HSLA 65 steel. Fully consolidated welds can be produced in HSLA 65 steel by PCBN...
    • ETD



    • Investigation of Heterogeneity of FSW Inconel 718 Coupled with Welding Thermal Cycle

    • Huang,Dong Fang 1969-

    • In order to develop a better understanding of the property, microstructure evolution and thermal history of FSW Inconel 718’s, the strain, strain rate and thermal cycles need to be determined. In order to estimate the strain field of a deformed...
    • ETD



    • Joining Polycrystalline Cubic Boron Nitride and Tungsten Carbide by Partial Transient Liquid Phase Bonding

    • Cook, Grant O III 1981-

    • Friction stir welding (FSW) of steel is often performed with an insert made of polycrystalline cubic boron nitride (PCBN). Specifically, MS80 is a grade of PCBN made by Smith MegaDiamond that has been optimized for the FSW process. The PCBN insert...
    • ETD



    • Material Flow Behavior in Friction Stir Welding

    • Liechty, Brian C 1976-

    • Material flow in friction stir welding is largely uncharacterized due to the difficulty in material flow measurement and visualization in metals. This study investigates plasticine for use as an analog for modeling material flow in friction stir...
    • ETD



    • Microstructural Evaluation in Friction Stir Welded High Strength Low Alloy Steels

    • Abbasi Gharacheh, Majid

    • Understanding microstructural evolution in Friction Stir Welding (FSW) of steels is essential in order to understand and optimize the process. Ferritic steels undergo an allotropic phase transformation. This makes microstructural evolution study...
    • ETD



    • Microstructure Evolution in 304L Stainless Steel Subjected to Hot Torsion at Elevated Temperature

    • Lu, Jian

    • The current study focus on investigating a relationship between processing variables and microstructure evolution mechanism in 304L stainless steel subjected to hot torsion. The Gleeble 3800 with Mobile Torsion Unit (MTU) is utilized in the current...
    • ETD



    • Numerical Modeling of Friction Stir Welding: A Comparison of Alegra and Forge3

    • Oliphant, Alma H 1976-

    • The objective of this research was to evaluate the capabilities of ALEGRA, a Sandia National Labs hydrocode, and Forge3, a Transvalor S.A. product, to accurately model the Friction Stir Welding Process. ALEGRA and Forge3 are discussed in light of...
    • ETD



    • Statistical Investigation of Friction Stir Processing Parameter Relationships

    • Record, Jonathan H 1977-

    • Friction Stir Welding (FSW) is an emerging joining technology in which basic process understanding is still inadequate. Knowledge of FSW parameter relationships is needed to better understand the process and implement proper machine control. This...
    • ETD



    • Two Dimensional Friction Stir Welding Model with Experimental Validation

    • Owen, Charles Blake 1979-

    • The performance of a coupled viscoplastic model of FSW has been evaluated over a variety of tool RPMs and feed rates. Initial results suggested that further optimization of the material parameters and an additional ability to model the thermal...
    • ETD



    • Using Design of Experiments and Electron Backscatter Diffraction to Model Extended Plasticity Mechanisms In Friction Stir Welded AISI 304L Stainless Steel

    • Nelson, Benjamin D

    • Extended plasticity mechanisms (EPM) allow a metal to undergo extended plastic deformation without failure. These mechanisms are responsible for the extended plastic deformation characteristic of hot working processes. In this thesis it is shown...
    • ETD

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