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Metallurgical and Process Variables Affecting the Resistance Spot Weldability of Galvanized Sheet Steels
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Abstract
Zinc coating integrity, composition, thickness, roughness, and the presence of Fe-Zn intermetallics are being investigated with regard to the mechanisms of weld nugget formation. This information is being used in conjunction with the optimization of the weld process parameters; such as upsloping, down-sloping, preheating, postheating, and double pulsing, to provide the widest range of acceptable welding conditions. Dynamic inspection monitoring of the welding current, voltage, force, and nugget displacement is being used to follow the progression of nugget formation and to assist in the evaluation of optimum process and material characteristics.
It has been found that hot-dipped galvanized materials with coatings which have a very thin Fe-Zn alloy layer, have a wider range of acceptable welding conditions than the commercial galvannealed products, which have a fully alloyed Fe-Zn coating. Small variations in the thickness and roughness of the G90 hot-dipped coatings studied seem to have no significant effect on the welding current range. Upsloping and downsloping of the weld current increases the welding range of hot-dipped products when using truncated cone electrodes, whereas sloped current has no advantage for galvannealed or uncoated materials. Radiused electrodes can increase the lobe width of hot-dipped products but are not beneficial when using sloped current or when welding galvannealed or uncoated materials.
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Authors
Citation
Gedeon, S., Schrock, D., LaPointe, J., and Eagar, T., "Metallurgical and Process Variables Affecting the Resistance Spot Weldability of Galvanized Sheet Steels," SAE Technical Paper 840113, 1984, https://doi.org/10.4271/840113.Also In
References
- Kaiser J. G. Dunn G. J. Eagar T. W. “The Effect of Electrical Resistance on Nugget Formation During Spot Welding,” Welding Journal June 1982 167s 174s
- Dickinson D. W. Natale T. V. “The Effect of Sheet Surface on Spot Weldability,” Republic Steel Corporation, Research Center, private communication
- Lavery R. C. Williams N. T. “Resistance Spot Welding of Galvanised Steel,” Sheet Metal Industries March 1970 201 204
- Krause H. J. Simon G. “Electrode Life of Spot Welding Electrodes Depending on Varied Parameters,” Proceedings Conference on Resistance Welding Essex Sept. 1981 85 100
- Johnson K. I. “Spot Welding Electrode Life Tests on Galvanised Steel Sheet,” Welding Institute Research Report Nov. 1975
- Krause H. J. Simon G. “Supplementary Models of Weld Nugget Formation Taking Resistance Spot Welding of Soft Non-Alloy Steels as an Example,” International Institute of Welding Conference Ljubljana, Jugoslawien Sept. 1982
- Williams N. T. “Problems in the Resistance Welding of Coated Steels,” Sheet Metal Industries Oct. 1972 625 633
- Fostini R. V. Dilay W. “The Effect of Surface Coating on the Weldability of HSLA Steels,” presented at the ASM/ADDRG Conference: Technological Impact of Surfaces April 1981
- Friedman L. M. McCauley R. B. “Influence of Metallurgical Characteristics on Resistance Welding of Galvanized Steel,” Welding Journal Oct. 1969 454s 462s
- Mackowiak J. Short N. R. “Metallurgy of Galvanized Coatings,” International Metals Reviews 1979 1 1 17
- Graham M. J. Beaubien P. E. Sproule G. I. “A Mossbauer Study of Fe-Zn Phases of Galvanized Steel,” Journal of Materials Science 1980 626 630
- Smith H. Batz W. “Iron-Zinc Alloy Formation During Galvannealing,” Journal of the Iron and Steel Institute Dec. 1972 895 900
- Freytag N. A. “A Comprehensive Study of Spot Welding Galvanized Steel,” Welding Journal April 1965 145s 156s
- “Spot Welding of Coated Sheets,” Welding in the World Feb. 1970 86 91
- Williams N. T. “Recent Developments in the Resistance Welding of Zinc Coated Steels,” Welding and Metals Fabrication June 1977 275 288