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Journal of Mechanical Science and Technology

, Volume 28, Issue 11, pp 4761–4769 | Cite as

Effects of surface coating on weld growth of resistance spot-welded hot-stamped boron steels

  • Chang-Wook Ji
  • Ilguk Jo
  • Hyunju Lee
  • Il-Dong Choi
  • Yang do Kim
  • Yeong-Do ParkEmail author
Article

Abstract

Aluminum-silicon-based and zinc-based metallic coatings have been widely used for hot-stamped boron steel in automotive applications. In this study, resistance spot weldability was explored by investigating the effects of the properties of metallic coating layers on heat development and nugget growth during resistance spot welding. In the case of the aluminum-silicon-coated hot-stamped boron steel, the intermetallic coating transformed into a liquid film that covered the faying interface. A wide, weldable current range was obtained with slow heat development because of low contact resistance and large current passage. In the case of the zinc-coated hot-stamped boron steel, a buildup of liquid and vapor formation under large vapor pressure was observed at the faying interface because of the high contact resistance and low vaporization temperature of the intermetallic layers. With rapid heat development, the current passage was narrow because of the limited continuous layer at the faying interface. A more significant change in nugget growth was observed in the zinccoated hot-stamped boron steel than in the aluminum-silicon-coated hot-stamped boron steel.

keywords

Contact resistance Hot-stamped boron steels Metallic coatings Nugget growth Resistance spot welding 

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Copyright information

© The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Chang-Wook Ji
    • 1
  • Ilguk Jo
    • 2
  • Hyunju Lee
    • 1
  • Il-Dong Choi
    • 3
  • Yang do Kim
    • 1
  • Yeong-Do Park
    • 4
    Email author
  1. 1.Department of Materials Science and EngineeringPusan National UniversityBusanKorea
  2. 2.Department of Metallurgical and Materials EngineeringColorado School of MinesGoldenUSA
  3. 3.School of Materials Science and EngineeringKorea Maritime and Ocean UniversityBusanKorea
  4. 4.Department of Advanced Materials EngineeringDong-Eui UniversityBusanKorea

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