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

研究成果: Article査読

12 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)76-80
ページ数5
ジャーナルScience and Technology of Welding and Joining
15
1
DOI
出版ステータスPublished - 2010 1月 1

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学

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