Joint Resistance Characteristics in Ultrasonic Weld REBCO CC Tapes at Various Temperatures and Magnetic Fields

Shin, Hyung-Seop; Diaz, Mark Angelo; Bautista, Zhierwinjay; Awaji, Satoshi

doi:10.1109/tasc.2017.2788085

Cited by 10 publications

(6 citation statements)

References 17 publications

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“…Previous research to improve current sharing in REBCO tape stacks/cables has been through techniques to change the inter-strand interface, including cold pressing [13][14][15][16], hot pressing [17], ultrasonic welding [18,19], metal-plating [13,17], and conductive polymer-CNT coating [20]. However, modification of the architecture of a single REBCO tape has not been explored to improve current sharing.…”

Section: Introductionmentioning

confidence: 99%

Current sharing in double-sided REBCO tapes

Xue,

Li,

Zhu

et al. 2024

Supercond. Sci. Technol.

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Current sharing between RE-Ba-Cu-O (REBCO, RE=rare earth) tapes within a high-temperature superconducting (HTS) coil or cable is important to avoid damage from uncontrolled quench of superconducting devices operating at high currents. Current sharing between REBCO tapes is found to be limited by contact resistivity between the adjacent tapes, which is about 20x higher in the REBCO-facing-substrate (face-to-back) configuration that is commonly used in devices compared to a REBCO-facing-REBCO (face-to-face) configuration. Double-sided REBCO tapes always offer face-to-face contacts between adjacent tapes, and this benefit for excellent current sharing has been validated in experiments wherein an artificial defect is introduced in one tape in a 2-ply tape stack. Additionally, current sharing between the two REBCO layers within one double-sided REBCO tape has also been investigated. Slotting of the double-sided tapes, wherein slots through the insulating buffer stack are filled with a conductive material, has been found to significantly enhance the current sharing from one REBCO layer to the opposite layer.

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Section: Introductionmentioning

confidence: 99%

Current sharing in double-sided REBCO tapes

Xue,

Li,

Zhu

et al. 2024

Supercond. Sci. Technol.

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“…Numerous techniques for main joints, including soldering joints [ 21 ], diffusion joints [ 22 ], melting diffusion joints [ 23 ], ultrasonic welding [ 24 ], and hybrid welding [ 25 ] were suggested and used for the fabrication of 2G HTS tapes for obtaining required lengths for coils and cables [ 26 ]. Soldering lap joints are the most commonly applied practical joint technique because of their fast and simple manufacturing procedures.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Mechanical Behavior and Electromechanical Properties of Solder-Jointed REBCO-Coated Conductors

Liao,

Wang,

Chen

et al. 2024

Materials

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As the second-generation high-temperature superconducting conductors, rare earth–barium–copper–oxide (REBCO) coated conductor (CC) tapes have good potential as high-field and high-energy superconductors. In superconducting applications, several joints are required for conjugating comparatively short REBCO CC tapes. Soldering lap joints are the simplest and most commonly applied REBCO CC joints. In addition to joint resistance, the mechanical behavior and electromechanical properties are also crucial for superconducting applications. In this paper, the electromechanical properties and mechanical behaviors of soldering lap joints at 77 K under a self-field were studied. The mechanical behavior was addressed by using a full three-dimensional multilayer elastic–plastic finite element model (FEM) with REBCO CC tape main layers and solder connecting layers. Then, the electromechanical properties were analyzed by using Gao’s strain-Ic degradation general model on the basis of the FEM results. Both the mechanical behavior and electromechanical properties were verified by experimental results. The effects of soldering lap conditions including lap length, soldering thickness and lap style on the electromechanical properties and mechanical behaviors were discussed. The results indicate that shorter overlap lengths and a thinner solder can reduce the premature degradation of Ic due to stress concentrations nearby the joint edges; moreover, the irreversible critical strain is significantly higher in the back-to-back joint approach compared to the widely used face-to-face joint approach.

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“…USW joining is one of the most efficient methods for joining polymer and its composites [4]. The blended PC/ABS polymers have been welded by imposing high frequency (20 kHz to 70 kHz) [5] vibrations under different ranges of holding pressure.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Process Parameters of Ultrasonically Welded PC/ABS Material Using Soft-Computing Techniques

Chinnadurai¹,

Prabaharan

Saravanan³

et al. 2021

IEEE Access

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Welding process is found to be a predominant procedure in most of the processing industries, especially in the automobile sector for maintenance operation and fabrication. Ultrasonic Polymer Welding (USW) is used for the joining process because of its flexibility and short needed welding time. In this article, two different polymer materials PC and ABS are blended in the ratio of 60:40 and molded into a sheet. Furthermore, molded PC/ABS sheets are joined using USW with different processing parameter settings. Three major influencing process parameters like pressure (P), amplitude (A) and weld time (Tw) are considered and other processing parameters are kept at constant. The experiment is carried out for 26 welded samples and from the obtained results it is noticed that the above-mentioned process parameters directly influence the tensile strength of welded joints. Additionally, the ultrasonically welded samples tensile strength is analyzed with the help of Artificial Neural Network technique (ANN) and Adaptive Neuro-Fuzzy Inference System method (ANFIS). From the simulation results, an optimized ANFIS model provides the superior result as compared to ANN. Moreover, Scanning Electron Microscope analysis is carried out to visualize the weld interface between the joint. Also, Finite Element Modeling (ANSYS) is performed to understand the heat dissipation during the welding process.

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Joint Resistance Characteristics in Ultrasonic Weld REBCO CC Tapes at Various Temperatures and Magnetic Fields

Cited by 10 publications

References 17 publications

Current sharing in double-sided REBCO tapes

Current sharing in double-sided REBCO tapes

Numerical Study on Mechanical Behavior and Electromechanical Properties of Solder-Jointed REBCO-Coated Conductors

Prediction of Process Parameters of Ultrasonically Welded PC/ABS Material Using Soft-Computing Techniques

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