Progress in high-field pulsed magnets and conductor development in Oxford

Jones, H.; Cleemput, M. Van; Hickman, A.L.; Ryan, D.; Saleh, P. M.

doi:10.1016/s0921-4526(97)00929-0

Cited by 14 publications

(10 citation statements)

References 7 publications

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“…A critical energy density of about 2.6·10 6 W·cm À2 is required for laser melting of copper [36,38,39]. A critical power density 3·10 6 W·cm À2 and pulse energy 40 J is sufficient to start melting copper with a focused laser beam (spot size about 0.05 cm) [31]. Keyhole initiation in a 1 mm thick pure copper plate was observed at a power density of 5.9·10 6 W·cm À2 and pulse energy of 10.5 J.…”

Section: The Peculiarities Of Copper and Its Alloys' Laser Weldingmentioning

confidence: 99%

“…Therefore, in principle, the welding of copperniobium conductors must be done with power density larger than 3·10 6 W·cm À2 and less than 5.9·10 6 W·cm À2 . Much higher power density is very harmful for welding because the material is in-tensively evaporated and splashed, the fluid phase practically is not present in the laser action area.…”

Section: The Peculiarities Of Copper and Its Alloys' Laser Weldingmentioning

confidence: 99%

“…Welding modes that require an output of more than 14 kW are not possible with this welding equipment. According to that, welding of copper-niobium conductors must be done with power density larger than 3·10 6 W·cm À2 and less than 5.9·10 6 W·cm À2 and pulse energy has to be not less than 40 J, the three welding modes can be selected. Table 7.…”

Section: Calculation and Selection Of Welding Parametersmentioning

confidence: 99%

“…This material is used in different magnetic installations, but also in levitation transport, high-voltage power lines, induction welding and industrial equipment of thermal treatment. Presently, the construction of solenoids of most magnetic equipment is multisectional, therefore it needs many electric contact connections [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…Besides, after magnetic systems enter into operation, access to all connections is very limited. All contact connections must not be the weakest component of the system [7]. However, in practice, only the screwed and sol-dered conductor connections, which do not demonstrate sufficient reliability and long service life in terms of impact loading and cyclic heating, are used [8].…”

Section: Introductionmentioning

confidence: 99%

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Laser welding of copper‐niobium microcomposite wires for pulsed power applications

Višniakov

Mikalauskas

Černašėjus

et al. 2019

Materialwissenschaft Werkst

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The laser welding of copper‐niobium microcomposite wires was investigated. It was determined that the joint structure does not have welding defects, while microscopic examination of the joint cross‐section showed that the microstructure of the autogenous weld consists mainly of a copper‐based solid solution strengthened by niobium‐rich precipitations. The weld obtained with use of filler material consists of two distinct zones, which are formed due to melting of filler wire and microcomposite wire. This structure of the joint provides an insignificant increase in electrical resistance and sufficient ultimate strength and plasticity of the joint. The tensile strength of the sample welded without filler material reaches 335 MPa, but such welded joints are very brittle due to very low ductility. However, an autogenous laser welding joint has about 1.6 times better ductility, and the tensile strength of the joint depends on the applied filler material and is equal to the tensile strength of this material.

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Section: The Peculiarities Of Copper and Its Alloys' Laser Weldingmentioning

confidence: 99%

Section: The Peculiarities Of Copper and Its Alloys' Laser Weldingmentioning

confidence: 99%

Section: Calculation and Selection Of Welding Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Laser welding of copper‐niobium microcomposite wires for pulsed power applications

Višniakov

Mikalauskas

Černašėjus

et al. 2019

Materialwissenschaft Werkst

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Electron beam welding of copper‐niobium microcomposites for pulsed power applications

Višniakov

Mikalauskas

Černašėjienė

et al. 2018

Materialwissenschaft Werkst

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The main objective of this work is to explore the possibility of applying electron beams to connect copper‐niobium conductors. Electron beam welding of copper–niobium microcomposite wires was investigated. The evaluation of welded joint properties was carried out according to the same methodology applied to contact electrical connections. The major electrical and mechanical properties of welded joints were established. The microscopic examination of the joint cross‐section showed that welded joints of copper‐niobium conductors have minimal thermal effects on the structure of the conductor and on the propagation of welding defects thanks to the welding in a vacuum. According to the non‐destructive radiographic test, the joint structure does not have welding defects. The difference in electrical resistances of the conductor and welded joint was below 20 %. The welded joint can withstand the maximum load, which is equal to 31.25 % of the load‐bearing capacity of microcomposite conductor.

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