Prediction Control Method of Spot Welded Nugget Size Based on Finite Element Analysis of Thermo-Electricity Transient
Dual-phase steel is a type of sheet material newly developed to adapt to the lightweight and safety needs of vehicle. In this paper, 1.7 mm thick dual-phase steel DP600 was taken as the object of study, its resistance spot welding performance characteristics and welding mechanism was studied in detail. The thermoelectricity transient process of welding was simulated with the finite element software and the experiment under corresponding welding parameters. It’s found that, under proper current circumstances, the simulated nugget size and the experimental result is in good agreement except the large current, the simulated deformation morphology and experimental result can be consistent, which indicates the good accuracy of analysis on resistance spot welding mechanism of dual-phase steel DP600. According to the results, the specific method and theoretical basis about nugget size and welding deformation predictive control was discussed, created the mutual relations between the resistance spot welding performance characteristics and welding mechanism of dual-phase steel DP600. The study effort has practical significance in comprehensively understanding the resistances spot welding mechanism of dual-phase steel, as well as in application and quality control of duplex steel in automotive body welding.
Jinglong Bu, Zhengyi Jiang and Sihai Jiao
H. Cai et al., "Prediction Control Method of Spot Welded Nugget Size Based on Finite Element Analysis of Thermo-Electricity Transient", Advanced Materials Research, Vols. 415-417, pp. 151-165, 2012