Joining of REBCO Coated Conductor Tapes Using Ultrasonic Welding Method

Shin, Hyung-Seop; Nisay, Arman Ray; Leon, Michael B. de; Dedicatoria, Marlon J.

doi:10.1109/tasc.2014.2367151

Cited by 28 publications

(24 citation statements)

References 10 publications

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“…Therefore, the resistance cannot be reduced significantly by splice welding instead of soldering [25]. A substantial reduction of the relatively high REBCO splice resistances is only possible by reducing the resistances inside the tapes.…”

Section: Discussionmentioning

confidence: 99%

Electromechanical behaviour of REBCO tape lap splices under transverse compressive loading

Grether

Bottura

Scheuerlein

et al. 2016

Supercond. Sci. Technol.

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Abstract.We have studied the influence of transverse compressive stress on the resistance and critical current (I c ) of soldered REBCO tape lap splices. Internal contact resistances dominate the overall REBCO lap splice resistances. Application of transverse compressive stress up to 250 MPa during the resistance measurements does not alter the resistance and I c of the soldered REBCO splices that were studied. The resistance of unsoldered REBCO tape lap splices depends strongly on the contact pressure. At a transverse compressive stress of 100 MPa to which Roebel cables are typically exposed in high field magnets, the crossover splice contact resistance is comparable to the internal tape resistances.

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Section: Discussionmentioning

confidence: 99%

Electromechanical behaviour of REBCO tape lap splices under transverse compressive loading

Grether

Bottura

Scheuerlein

et al. 2016

Supercond. Sci. Technol.

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show abstract

“…15. Specific joint resistance (R sj ) and apparent joint resistance (R j ) -joint length relationship in UW jointed CC tapes with Hastelloy substrate with curve fit of calculated R j values using the formula R jn =R j base /n; where R j base represents the joint resistance for the base joint length of 30 mm in this study, and R jn is the resistance at a specific joint length which is n-multiple times of the base joint length [73].…”

Section: Tape Joints For Device Applicationmentioning

confidence: 99%

“…Recently, we have reported a new joint method using ultrasonic welding (UW) [73]. This welding method is applicable in joining of metal alloys and thermoplastics through the frictional heat generated from a localized high frequency ultrasonic vibration.…”

Section: Tape Joints For Device Applicationmentioning

confidence: 99%

Review of progress in electromechanical properties of REBCO coated conductors for electric device applications

Shin¹,

Dedicatoria²

2014

Progress in Superconductivity and Cryogenics

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“…If adjacent REBCO coil windings in NMR systems are mutually joined by an NbTi wire, this may act as a useful REBCO/REBCO joint. Although ultrasonic welding joint techniques have been studied for lower interface resistivity [21,22], the simplest way to connect the HTS to LTS wires is by the soldering method. At this moment, the most probable method to achieve an ultralow-resistance joint suitable for persistent mode NMR operation would be to increase the soldering contact area between the HTS and LTS wires.…”

Section: Introductionmentioning

confidence: 99%

A new concept for developing a compact joint structure for reducing joint resistance between high-temperature superconductors (HTS) and low-temperature superconductors (LTS)

Banno

Asano

Kato

et al. 2020

Supercond. Sci. Technol.

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It is significantly difficult to develop a superconducting joint between REBCO and low-temperature superconductors (LTS) using a solder matrix replacement technique. This is because the REBCO superconducting layer is highly corrosive to Sn. In this work, TEM observations were first conducted on the reaction interface between the REBCO layer and Sn to reveal the reaction. Then, a new idea to create a compact low-resistance joint to reduce the joint resistance between REBCO and LTS was proposed. In this method, the REBCO tape is rolled in a metal boat, with the Cu stabilizer remaining around the tape. Then, an LTS wire, whose superconducting filament ends are coated with a superconducting solder, is set straight into a boat. Then, the boat is filled with a superconducting solder, so that the joint state between the LTS and superconducting solder matrix remains superconductive. However, the electrical joint between the REBCO tape and the solder matrix is resistive, even if the solder matrix is superconductive. Consequently, the overall joint resistance is determined by the boundary resistance between the REBCO tape and the superconducting solder matrix. However, to achieve a joint resistance below 10–10 Ω, a long joint length of more than 5 m, preferably more than 10 m, will be required. Considering the strain state of the REBCO layer when it is rolled in to a boat, the boat-type joint structure proposed in this work enables the joint size to be significantly compact, even if a length of more than 10 m is required. At present, a joint resistance of 0.7 nΩ was obtained in a field range of less than 0.4 T by using a boat with an inner size dimensions as follows: 50 mm length, 16 mm width, 7 mm height, radius of curvature of 8 mm, and tape length of 2 m.

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Joining of REBCO Coated Conductor Tapes Using Ultrasonic Welding Method

Cited by 28 publications

References 10 publications

Electromechanical behaviour of REBCO tape lap splices under transverse compressive loading

Electromechanical behaviour of REBCO tape lap splices under transverse compressive loading

Review of progress in electromechanical properties of REBCO coated conductors for electric device applications

A new concept for developing a compact joint structure for reducing joint resistance between high-temperature superconductors (HTS) and low-temperature superconductors (LTS)

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