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Influence of heat-treated Al–Si coating on the weldability and microstructural inhomogeneity for hot stamped steel resistance nut projection welds

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Abstract

Resistance nut projection weldability of Al–Si coated hot stamped steel (HSS) was investigated under the viewpoint of weldable current range and joint strength (pull-out load). The microstructural inhomogeneities in the welds were also studied in order to elucidate the factors affecting the joint strength of the welds. The weldability of the given Al–Si coated HSS was compared with the weldability of an identical HSS without the Al–Si coating (Al–Si coating was polished out) and Zn coated dual phase steel. The weldable current range of Al–Si coated HSS was found to be narrower than that of the other materials. Furthermore, the average pull-out load within the weldable current range of the Al–Si coated HSS was the lowest among the three materials. The reason for poor weld mechanical property of the Al–Si coated hot-stamped steel was attributed to the microstructural inhomogeneities such as unmixed Al–Si coating layer at the edge of the nugget and the second phase Fe3(Al, Si) intermetallic compound. The formation of Fe3(Al, Si) phase was attributed to the solidification segregation of Al and Si during the weld solidification and was confirmed with the numerical analysis of solidification segregation.

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Authors and Affiliations

  1. Busan Machinery Research Center, Korea Institute of Machinery and Materials, 48, Mieumsandan 5-ro, 41beon-gil, Gangseo-gu, Busan, 46744, Republic of Korea

    Eun-Joon Chun

  2. Department of Marine Equipment Engineering, Korea Maritime and Ocean University, 727 Taejong-ro, Yeongdo-Gu, Busan, 49112, Republic of Korea

    Sung-Sang Lim

  3. Sheet Metal Development Team, Hyundai Motor R&D Center, 150, Hyundaiyeonguso-ro, Namyang-eup, Hwaseong-si, Gyeonggi-do, 18280, Republic of Korea

    Young-Tae Kim

  4. Advanced Technology Team, Sungwoo Hitech Co. Ltd., 18-2, Sojugongdan 6beon-gil, Yangsan-si, Gyeongsangnam-do, 50511, Republic of Korea

    Ki-Sung Nam

  5. Joining R&D Group, Korea Institute of Industrial Technology, 156 Gaetbeol-ro, Yeonsu-Gu, Incheon, 21999, Republic of Korea

    Young-Min Kim

  6. Department of Mechanical Engineering, Pukyong National University, 365 Sinseon-ro, Nam-gu, Busan, 48547, Republic of Korea

    Young-Whan Park

  7. Department of Advanced Materials Engineering, Dong-Eui University, 995 Eomgwang-ro, Busanjin-gu, Busan, 47340, Republic of Korea

    Siva Prasad Murugan & Yeong-Do Park

Authors
  1. Eun-Joon Chun
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  2. Sung-Sang Lim
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  3. Young-Tae Kim
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  4. Ki-Sung Nam
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  5. Young-Min Kim
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  6. Young-Whan Park
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  7. Siva Prasad Murugan
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  8. Yeong-Do Park
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Correspondence to Yeong-Do Park.

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Chun, EJ., Lim, SS., Kim, YT. et al. Influence of heat-treated Al–Si coating on the weldability and microstructural inhomogeneity for hot stamped steel resistance nut projection welds. Met. Mater. Int. 25, 179–192 (2019). https://doi.org/10.1007/s12540-018-0108-5

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  • DOI: https://doi.org/10.1007/s12540-018-0108-5

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