Development of a Magnetic Phase Map for Analysis of the Internal Structure of a Spot Weld

Nannan Song, Keisyu Shiga, Kenji Sakai, Toshihiko Kiwa, Keiji Tsukada

Research output: Chapter in Book/Report/Conference proceedingChapter

2 Citations (Scopus)

Abstract

Resistance spot welding technologies are widely used in industry. We previously reported an analysis method for examining the strength of spot-welded parts with the eddy current test (ECT) by using a wide range of frequencies from high to low. However, liftoff has a non-negligible effect. Increasing the liftoff significantly decreases the magnetic field intensity for mapping. The magnetic field phase is not affected by changes in liftoff. The measured phase map of the magnetic field showed a good correlation with the results of the destructive shear test. In this paper, we report an analysis and imaging method for examining spot-welded parts based on the phase of a magnetic field by using a wide range of frequencies from high to low. With the magnetic phase map, the internal structure of a spot weld was visualized for easy understanding of the results of this method. Thus, this method can easily be applied to industrial production. This new method was validated through both experimental and simulation results.

Original languageEnglish
Title of host publicationElectromagnetic Nondestructive Evaluation (XIX)
PublisherIOS Press
Pages302-311
Number of pages10
Volume41
ISBN (Electronic)9781614996385
DOIs
Publication statusPublished - 2016

Publication series

NameStudies in Applied Electromagnetics and Mechanics
Volume41
ISSN (Print)13837281
ISSN (Electronic)18798322

Keywords

  • Eddy current test
  • Liftoff
  • Phase
  • Spot welding

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Mechanical Engineering

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  • Cite this

    Song, N., Shiga, K., Sakai, K., Kiwa, T., & Tsukada, K. (2016). Development of a Magnetic Phase Map for Analysis of the Internal Structure of a Spot Weld. In Electromagnetic Nondestructive Evaluation (XIX) (Vol. 41, pp. 302-311). (Studies in Applied Electromagnetics and Mechanics; Vol. 41). IOS Press. https://doi.org/10.3233/978-1-61499-639-2-302