Journal ArticleDOI
Mechanisms of electrode degradation when spot welding coated steels
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In this paper, the authors compared the behavior of precipitation hardened and dispersion strengthened electrodes during the manufacture of resistance spot welds in coated steel sheet and found that the primary mechanism causing the failure of spot welding electrodes was growth of the electrode tip.Abstract:
The present work compares the behaviour of precipitation hardened and dispersion strengthened electrodes during the manufacture of resistance spot welds in coated steel sheet. The primary mechanism causing the failure of spot welding electrodes was growth of the electrode tip. Under normal welding conditions electrode tip growth was primarily dependent on local alloying morphology so that deterioration was mainly a function of the type of coating present on the steel. However, welding with high currents or use of current stepping programmes could extend electrode performance such that softening became a more dominant electrode degradation mechanism. Under these conditions, use of dispersion strengthened material could extend electrode campaign life.read more
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Journal ArticleDOI
Surface modification of resistance welding electrode by electro-spark deposited composite coatings: Part I. Coating characterization
Zheng Chen,Y. Zhou +1 more
TL;DR: In this article, the microstructure and mechanical properties of the multi-layer Ni/(TiCP/Ni)/Ni composite coatings have been characterized by scanning electron microscopy, energy dispersive X-ray analysis, Xray diffraction and microhardness tests.
Journal ArticleDOI
Liquid metal embrittlement during resistance spot welding of Zn-coated high-strength steels
TL;DR: In this paper, the authors present a state-of-the-art review on the surface cracking properties of Zn-coated high strength steels and present a method to prevent surface cracking.
Journal ArticleDOI
Review of resistance spot welding of steel sheets Part 2 Factors influencing electrode life
N. T. Williams,J. D. Parker +1 more
TL;DR: In this article, the authors highlighted the factors influencing the formation and growth of the weld nugget in resistance spot welding and highlighted the application of artificial intelligence techniques in overcoming the problems encountered.
Journal ArticleDOI
Modeling and numerical simulation of the resistance spot welding of zinc coated steel sheets using rounded tip electrode: Analysis of required conditions
TL;DR: In this article, the essential conditions to improve the accuracy of a resistance spot welding computational study of advanced zinc coated steel sheets using rounded tip electrode are investigated, and an experimental analysis is performed to highlight the required considerations for a suitable simulation.
Journal ArticleDOI
Surface modified long-life electrode for resistance spot welding of Zn-coated steel
TL;DR: In this article, a multi-layer Ni/(TiCP/Ni)/Ni composite coating was deposited onto the copper electrode top surface by electro-spark deposition, and micro-hardness tests were employed to characterize the microstructure and property of the coating.