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Effects of Transformer Tap Settings on the Resistance Spot Weldability of Hot-Dipped Galvanized Steel: Nugget Development Studies
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Abstract
This paper is a continuation of previous work on the effects of tap setting and percent heat on the weldability of galvanized steel. A previous work dealt with changes in current range behavior. This paper considers changes in nugget development. Six separate tap settings were selected for study corresponding to a range of off-times in the current wave form at expulsion. Welds were then made at each tap setting for increasing weld times and sectioned metallographically. It was found that the change in off-time led to significant changes in the morphology, size and rate of weld growth. These results were explained in some degree through changes in the mechanism of resistance heating for various off-times.
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Citation
Gould, J. and Stotler, T., "Effects of Transformer Tap Settings on the Resistance Spot Weldability of Hot-Dipped Galvanized Steel: Nugget Development Studies," SAE Technical Paper 900739, 1990, https://doi.org/10.4271/900739.Also In
References
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- 1970 Recommended practices for resistance welding coated low carbon steel Miami, Florida American Welding Society
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- Orts, D.H. 1967 The effect of zinc coating in resistance spot welding galvanized steel The Ohio State University
- Boman, J.J. 1986 An investigation of dynamic resistance curves produced during spot welding galvanized sheet steels The Ohio State University
- Gould, J.E. Peterson, W.A. 1987 Resistance welding research evaluations of coated steels, Part 3: nugget growth characteristics EWI Report No. J7043-87-3 Columbus, Ohio Edison Welding Institute
- Bowers, R.J. Eagar, T.W. 1986 Non-uniform current distribution in spot welding Sheet Metal Welding Conference II Detroit, Michigan AWS Detroit Section