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Microstructure and fatigue resistance of high strength dual phase steel welded with gas metal arc welding and plasma arc welding processes

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Abstract

This study presents the microstructure and high cycle fatigue performance of lap shear joints of dual phase steel (DP590) welded using gas metal arc welding (GMAW) and plasma arc welding (PAW) processes. High cycle fatigue tests were conducted on single and double lap joints under a load ratio of 0.1 and a frequency of 20 Hz. In order to establish a basis for comparison, both weldments were fabricated to have the same weld depth in the plate thickness. The PAW specimens exhibited a higher fatigue life, a gentle S-N slope, and a higher fatigue limit than the GMAW specimens. The improvement in the fatigue life of the PAW specimens was primarily attributed to the geometry effect that exhibited lower and wider beads resulting in a lower stress concentration at the weld toe where cracks initiate and propagate. Furthermore, the microstructural constituents in the heat-affected zone (HAZ) of the PAW specimens contributed to the improvement. The higher volume fraction of acicular ferrite in the HAZ beneath the weld toe enhanced the PAW specimen’s resistance to fatigue crack growth. The double lap joints displayed a higher fatigue life than the single lap joints without changing the S-N slope.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Hanbat University, 125 Dongseo-daero, Yuseong-gu, Daejeon, 305-719, Korea

    Godwin Kwame Ahiale, Yong-Jun Oh & Won-Doo Choi

  2. Research & Development Division, Hyundai Motor Group Automotive, 150 Hyundaiyeonguso-ro, Hwaseong, Gyeonggi-do, 445-706, Korea

    Kwang-Bok Lee

  3. Global Coordination Center-China, Hyundai Motor Group Automotive, 150 Hyundaiyeonguso-ro, Hwaseong, Gyeonggi-do, 445-706, Korea

    Jae-Gyu Jung

  4. KISTI ReSEAT Program, Korea Institute of Science and Technology Information, 66 Hoegi-ro, Dongdaemun-gu, Seoul, 130-741, Korea

    Soo Woo Nam

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  1. Godwin Kwame Ahiale
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  2. Yong-Jun Oh
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  3. Won-Doo Choi
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  4. Kwang-Bok Lee
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  5. Jae-Gyu Jung
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Correspondence to Yong-Jun Oh.

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Ahiale, G.K., Oh, YJ., Choi, WD. et al. Microstructure and fatigue resistance of high strength dual phase steel welded with gas metal arc welding and plasma arc welding processes. Met. Mater. Int. 19, 933–939 (2013). https://doi.org/10.1007/s12540-013-5005-3

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  • DOI: https://doi.org/10.1007/s12540-013-5005-3

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