An Empirical relationship for Estimating Metallurgical and Mechanical Behavior of Resistance Spot Welded DP800 Steel Joints
DOI:
https://doi.org/10.37255/jme.v4i2pp066-070Keywords:
DP steel, Resistance spot welding, Tensile shear fracture, MicrostructuresAbstract
Similar joints of DP800 (Dual Phase) steel in lap joint configuration were fabricated using resistance spot welding (RSW) process. The process parameters were optimized using DOE (design of experiments) and the welds joints were fabricated using the obtained DOE matrix. The tensile shear fracture load (TSFL) of joints was evaluated using universal testing machine. Microhardness variations across the weld cross-section was recorded using Vickers’s microhardness tester. Microstructural features were analyzed using optical microscopy (OM) and scanning electron microscopy (SEM). From this investigation, it is understood that increase in welding current increases the nugget zone size and it led to increasing the degrease of softening in the HAZ. The tensile shear strength is found to increase with increase in welding current up to a certain limit and then it decreases. The microhardness profile shows a peak hardness in nugget zone and the hardness is lower in the HAZ. The softening of HAZ is mainly attributed to inter-critical heating during welding.Downloads
References
Mucha J, Kašcák L and Spišák E (2013), “The experimental analysis of forming and strength of Clinch Riveting sheet metal joint made of different materials”, Adv.Mech. Eng., Vol. 59, 1-11.
Zhang X, Chen G, Zhang Y and Lai X (2009), “Improvement of resistance spot weldability for dual-phase (DP600) steels using servo gun”, J. Mat. Proc. Technol., Vol. 209, 2671-2675.
Hernandez V H B, Panda S K, Okita Y and Zhou N Y (2010), “A study on heat affected zone softening in resistance spot welded dual phase steel by nanoindentation”, J. Mat. Sci., Vol. 45, 1638-1647.
Kašcák L, Brezinová J, Mucha J (2015), “Evaluation of corrosion resistance of galvanized steel sheets used in automotive production”, Mat. Sci. Forum, Vol. 818, 141-144.
Dancette S, Fabregue D, Estevez R, Massardier V, Dupuy T and Bouzekri M (2012), “A finite element model for the prediction of Advanced High Strength Steel spot welds fracture”, Eng. Fracture Mech., Vol.87, 48-61.
Kašcák L, Spišák E and Gajdoš I (2015), “Influence of welding parameters on the quality of resistance spot welded joints of DP600 steels”, Key Eng. Mat., Vol. 635, 143-146.
Pouranvari M, Marashi S P H and Jaber H L (2015), “DP780 dual-phase-steel spot welds: critical fusion-zone size ensuring the pull-out failure mode”, Mat. Technol., Vol. 49, 579-585.
Lifang M, Jiming Y, Dongbing Y, Jinwu L and Genyu C (2012), “Comparative study on CO2 laser overlap welding and resistance spot welding for galvanized steel”, Mat.Design, Vol. 40, 433-442.
S J Hu, J Senkara and H Zhang: quality definition of resistance spot welds: A structural poni of view, in proceeding of international body engineering conference IBEC’96, body and engineering section, Detroit, MI 1996
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