Abstract
Resistance spot weldability of high strength steel (HSS) sheets for automobiles and the quality assurance technique of joints were investigated. The suitable welding current range in spot welding of HSS sheets shifted to the lower current side compared with that of mild steel sheets and it was affected by the electrode force. Vickers hardness at the welded zone increased with an increase of base steel carbon content. Tensile shear strength (TSS) of joints increased with an increase of nugget diameter, sheet thickness, and base steel strength. The cross tension strength (CTS) of joints increased with an increase of nugget diameter and sheet thickness. However, it showed a peak for base steel strength and carbon equivalent. Fatigue strength didn’t increase with base steel strength. The suitable welding current range in spot welding of galvannealed HSS sheets shifted to the higher current side compared with that of bare HSS sheets. Electrode tip life for galvannealed HSS sheets was over 3 000 points and it was a practical use level. It’s possible to assure the joint strength by estimating the nugget diameter using current and voltage during spot welding.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Oikawa H., et al.: Resistance spot welding technologies of high strength steel (HSS) sheets for the purpose of improving joint reliability, Proceedings of 2005 JSAE Annual Congress, 2005, 20054276, pp. 13–18.
Takahashi Y.: Resistance spot welding of high strength steel sheets, Welding Technology, No. 3, pp. 24–28 (1977).
Yamazaki K., et al.: Joint strength property of spot-welded ultra high strength cold rolled steel sheets, Quarterly Journal of the Japan Welding Society, 1999, Vol. 17, No. 4, pp. 553–560.
Ono M.: Resistance spot weldability of high strength steel sheets for automobile, Proceedings of Committee of Joining and Material Processing for Light Structures, 2003, MP-347–2003.
Ono M.: Resistance spot weldability of high strength steel sheets for automobile, Welding Technology, 2003, No. 3, pp. 77–82.
Saito T.: Resistance spot welding of high strength steel, Welding Technology, 1982, No. 3, pp. 34–38.
Saito T., Takahashi Y.: Spot welding conditions for steel sheet specimens having gaps in them — Study of spot welding of high strength sheet steels, IIW Doc. III-836–86, 1986.
Steel Hand Book No. 1 Theory, edited by ISIJ, Tokyo, Maruzen, 1962, pp. 33.
Nishi T.: Evaluation of spot weldability of high-strength sheet steels for automobile use, Nippon Steel Technical Report, December 1982, No. 20.
Funakawa Y., et al.: Estimation of cross tension strength of spot welded joint, Proceedings of Japan Welding Society, 1994, Vol. 54, pp. 256–257.
Matsuyama K.: Hybrid simulations for in-line visualisation in resistance spot welding, Doc. IIW-1725-05 (ex-Doc. III-1348–05), Welding in the World, 2006, Vol. 50, No. 5/6, pp. 14–23.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Oikawa, H., Murayama, G., Hiwatashi, S. et al. Resistance Spot Weldability of High Strength Steel Sheets for Automobiles and the Quality Assurance of Joints. Weld World 51, 7–18 (2007). https://doi.org/10.1007/BF03266555
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF03266555