Development of electromagnetic nondestructive testing for inspecting mechanical lap joint of higherature superconducting tapes

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

To facilitate construction and maintenance of nuclear fusion reactors, a remountable (demountable) higherature superconducting magnet was proposed. The magnet is assembled from several segments with mechanical joints. The electrical resistance of joint (joint resistance) at cryogenic temperature has great influence on the performance of the magnet, a nondestructive testing technique at room temperature is highly demanded to predict joint resistance. In this study, the electrical characteristics of the joint were focused on to develop an electromagnetic NDT technique for inspecting the joint. To identify the factors relating to the joint resistance and the correlation between the electrical characteristics, the cross sections of the joint were observed and the electrical resistance and impedance of the joint were measured. The result indicated a small air gap existing in the joint that could possibly be the cause for increment in joint resistance, though the degree of influence of such gap could not be evaluated over measured electrical resistance and impedance result. Causal analyses were conducted by numerical models, which indicated arranging the current perpendicular to the joint surface is effective for inspecting the joint. Then additional numerical analyses were conducted to evaluate the feasibility of applying the direct measurement and eddy current testing for inspection. The result showed the possibility of detecting particular air gap, optimization of the measurement condition is required.

Original languageEnglish
Title of host publicationProceedings of 2017 IEEE Far East NDT New Technology and Application Forum, FENDT 2017
EditorsChunguang Xu
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages202-206
Number of pages5
ISBN (Electronic)9781538616147
DOIs
Publication statusPublished - 2018 Dec 20
Event2017 IEEE Far East NDT New Technology and Application Forum, FENDT 2017 - Xi'an, China
Duration: 2017 Jun 222017 Jun 24

Publication series

NameProceedings of 2017 IEEE Far East NDT New Technology and Application Forum, FENDT 2017

Other

Other2017 IEEE Far East NDT New Technology and Application Forum, FENDT 2017
CountryChina
CityXi'an
Period17/6/2217/6/24

Keywords

  • X-ray CT
  • eddy current
  • fusion reactor
  • joint resistance
  • mechanical lap joint
  • remountable higherature superconducting

ASJC Scopus subject areas

  • Mechanics of Materials
  • Safety, Risk, Reliability and Quality
  • Civil and Structural Engineering
  • Instrumentation

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