Degradation mechanism of electrode tip during alternate resistance spot welding of zinc coated and uncoated steel sheets

M. Kondo, T. Konishi, K. Nomura, H. Kokawa

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

The operation life and degradation mechanism of electrode during resistance spot alternating current welding of zinc coated galvannealed steel sheets were investigated. The electrode life in alternate resistance spot welding of zinc coated and uncoated steel sheets was extremely short in comparison with welding only on zinc coated steel sheets. During alternate resistance spot welding, the ring shaped nuggets were formed easily. This is attributable to the sticking of the alloy layers formed on the electrode top during the previous welding of zinc coated steel, to the uncoated steel surface at the following welding, so that notable wear took place, and the surface profile of electrode tip became flat. Additionally, an accumulation of highly resistant carbonaceous substance layer at the centre of electrode top caused an annular flow of welding current to hinder the nugget formation.

Original languageEnglish
Pages (from-to)76-80
Number of pages5
JournalScience and Technology of Welding and Joining
Volume15
Issue number1
DOIs
Publication statusPublished - 2010 Jan 1

Keywords

  • Electrode life
  • Electrode tip
  • Resistance spot welding
  • Ring shaped nugget
  • Zinc coated steel sheet

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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