Spot Welding

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The Experts below are selected from a list of 20751 Experts worldwide ranked by ideXlab platform

Keke Zhang - One of the best experts on this subject based on the ideXlab platform.

Glenn J Grant - One of the best experts on this subject based on the ideXlab platform.

  • friction stir Spot Welding of hot stamped boron steel
    Scripta Materialia, 2007
    Co-Authors: Yuri Hovanski, Michael L Santella, Glenn J Grant
    Abstract:

    Hot-stamped boron steel was successfully joined via friction stir Spot Welding using polycrystalline cubic boron nitride tooling. The resulting microstructure, microhardness and mechanical properties are reported, including a brief look into failure mechanisms. Relationships between the unique mechanical mixing, phase transformations and failure initiation sites associated with joining martensitic steels are characterized.

Hua Yu - One of the best experts on this subject based on the ideXlab platform.

Eveline Hage - One of the best experts on this subject based on the ideXlab platform.

  • preliminary study on the feasibility of friction Spot Welding in pmma
    Materials Letters, 2010
    Co-Authors: P H F Oliveira, J Dos F Santos, S T Amanciofilho, Eveline Hage
    Abstract:

    Abstract In this work the feasibility of friction Spot Welding of thermoplastics was investigated on poly (methyl methacrylate) plates. Preliminary results have shown that the weld strength is comparable to other available Welding techniques, while joining times are equal or shorter. Light optical microscopy and Vickers microhardness measurements showed the presence of a heat affected zone and a thin, consolidated stir zone, where physical–chemical transformations related to thermo-mechanical processing led to changes in local mechanical strength. The work has demonstrated for the first time that the Welding of thermoplastic materials by friction Spot Welding is feasible.

Thomas H. North - One of the best experts on this subject based on the ideXlab platform.

  • Resistance and friction stir Spot Welding of DP600: a comparative study
    Science and Technology of Welding and Joining, 2007
    Co-Authors: M. I. Khan, Michael L. Kuntz, P. Su, Adrian P. Gerlich, Thomas H. North
    Abstract:

    Efforts to reduce vehicle weight and improve crash performance have resulted in increased application of advanced high strength steels ( AHSS) and a recent focus on the weldability of these alloys. Resistance Spot Welding (RSW) is the primary sheet metal Welding process in the manufacture of automotive assemblies. Friction stir Spot Welding (FSSW) was invented as a novel method to Spot Welding sheet metal and has proven to be a potential candidate for Spot Welding AHSS. A comparative study of RSW and FSSW on Spot Welding AHSS has been completed. The objective of this work is to compare the microstructure and mechanical properties of Zn coated DP600 AHSS (1.2 mm thick) Spot welds conducted using both processes. This was accomplished by examining the metallurgical cross-sections and local hardnesses of various Spot weld regions. High speed data acquisition was also used to monitor process parameters and attain energy outputs for each process. Results show a correlation found among microstructure, failure loads, energy requirements and bonded area for both Spot Welding processes.

  • stir zone microstructure and strain rate during al 7075 t6 friction stir Spot Welding
    Metallurgical and Materials Transactions A-physical Metallurgy and Materials Science, 2006
    Co-Authors: Adrian P. Gerlich, G Avramoviccingara, Thomas H. North
    Abstract:

    The factors determining the temperature, heating rate, microstructure, and strain rate in Al 7075-T6 friction stir Spot welds are investigated. Stir zone microstructure was examined using a combination of transmission electron microscopy (TEM) and electron backscattered diffraction (EBSD) microscopy, while the strain rate during Spot Welding was calculated by incorporating measured temperatures and the average subgrain dimensions in the Zener-Hollomon relation. The highest temperature during friction stir Spot Welding (527 °C) was observed in Spot welds made using a tool rotational speed of 3000 rpm. The stir zone regions comprised fine-grained, equiaxed, fully recrystallized microstructures. The calculated strain rate in Al 7075-T6 Spot welds decreased from 650 to about 20 s−1 when the tool rotational speed increased from 1000 to 3000 rpm. It is suggested that the decrease in strain rate results when tool slippage occurs when the Welding parameter settings facilitate transient local melting during the Spot Welding operation. Transient local melting and tool slippage are produced when the Welding parameters produce sufficiently high heating rates and temperatures during Spot Welding. However, transient local melting and tool slippage is not produced in Al 7075-T6 Spot welds made using a rotational speed of 1000 rpm since the peak temperature is always less than 475 °C.

  • energy utilisation and generation during friction stir Spot Welding
    Science and Technology of Welding and Joining, 2006
    Co-Authors: P. Su, Adrian P. Gerlich, Thomas H. North, G. J. Bendzsak
    Abstract:

    AbstractEnergy utilisation during Spot Welding is investigated using a combination of calorimetry, peak temperature measurement and plunge testing. When a steel tool, clamp and anvil support is used, only 12·6% of the energy generated during the Spot Welding is transferred into the welded Al 6111 sheets. In contrast, when a mica clamp and anvil support are used, 50% of the energy generated during Spot Welding transfers into the welded Al 6111 sheets. Only a small percentage of the energy generated during the friction stir Spot Welding operation is required for stir zone formation. During plunge testing of 6·3 mm thick Al 6061-T6 material, less than 4·03% of the energy which is generated during friction stir Spot Welding is required for stir zone formation. The remainder of the energy generated dissipates into the tool assembly, clamp, anvil support and the aluminium sheets which are being welded. The rotating pin produces around 70% of the energy generated during Spot Welding of 6·3 mm thick Al-6061 mater...

  • material flow during friction stir Spot Welding
    Science and Technology of Welding and Joining, 2006
    Co-Authors: P. Su, Adrian P. Gerlich, Thomas H. North, G. J. Bendzsak
    Abstract:

    AbstractMaterial flow during friction stir Spot Welding is investigated. An examination of dissimilar Al 5754/Al 6111 Spot welds was conducted to allow visualisation of material flow based on their differing etching characteristics. In addition, Al 6061–T6 Spot welds containing Al2O3 tracer particles were examined to highlight the movement of material in different joint regions. It has been confirmed that upper sheet material is moved downwards into the lower sheet when a layer of upper sheet material is pushed ahead at the tip of the rotating pin, when upper sheet material becomes trapped at the root of the pin thread, and when an adhering layer of upper sheet material forms at the pin periphery during Spot Welding using a smooth pin. Lower sheet material is displaced upwards and outwards in a spiral motion when the rotating pin forms the keyhole. Two distinct zones of material flow are produced during friction stir Spot Welding: an inner flow zone close to the pin periphery where upper sheet material mo...

  • tool penetration during friction stir Spot Welding of al and mg alloys
    Journal of Materials Science, 2005
    Co-Authors: Adrian P. Gerlich, P. Su, Thomas H. North
    Abstract:

    The mechanism of tool penetration during friction stir Spot Welding of Al-alloy and Mg-alloy sheet materials is investigated and is explained as a progression of wear events, from mild wear to severe wear and then to melt wear in material beneath the base of the rotating pin. Melt wear can also occur under the rotating tool shoulder provided that sufficient penetration of the upper sheet occurs during the Spot Welding operation.

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