Degradation mechanism of electrode tip during alternate resistance spot welding of zinc-coated galvannealed and un-coated steel sheets

Masatsune Kondo, Tokujiro Konishi, Koji Nomura, Hiroyuki Kokawa

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

This study investigated the electrode life and the electrode degradation mechanism during alternate resistance spot welding of galvannealed steel sheets and bare steel sheets. As the result, it was found that the electrode life in this type of welding was extremely short in comparison to welding of only galvannealed steel sheets. The reason for this short life is explained by the sticking of the alloy layers formed on the electrode top to the bare steel sheet surface, so that the narrower and sharper shape as the original electrode top is the better to prolong the life. Although the ring-shape nuggets were not formed during alternate resistance DC welding, the electrode degradation mechanism is similar to that during the resistance DC welding of only galvannealed steel sheets.

Original languageEnglish
Pages (from-to)352-359
Number of pages8
JournalYosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society
Volume27
Issue number4
DOIs
Publication statusPublished - 2009 Dec 1

Keywords

  • Electrode life
  • Electrode tip
  • Resistance spot welding
  • Ringed nugget
  • Zinc-coated steel sheet

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces, Coatings and Films
  • Metals and Alloys

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