The effects of weld nugget size and expulsion on the performance of low carbon steel resistance spot weld have been investigated in the present paper. Failure mode, peak load and failure energy obtained in tensile–shear test have been used to describe the performance of spot weld. The influence of voids and porosity as well as electrode indentation associated with expulsion on peak load and failure energy is discussed. The results showed that although expulsion does not reduce the load carrying capacity of spot welds, it decreases their energy absorption capability which was attributed to the change of failure location due to excessive electrode indentation associated with expulsion.
PouranvariM., AsgariH. R., MosavizadehS. M., MarashiP. H. and GoodarziM.: Sci. Technol. Weld. Join., 2007, 12, 217–225.
2.
MarashiP., PouranvariM., AmirabdollahianS., AbediA. and GoodarziM.: Mater. Sci. Eng. A, 2007, to be published.
3.
ZhangH. and SenkaraJ.: ‘Resistance welding: fundamentals and applications’; 2005, Boca Raton, FL, Taylor & Francis CRC Press.
4.
KimichiM.: Weld. J., 1984, 63, 58s–63s.
5.
NewtonC. J., BrowneD. J., ThorntonM. C., BoomerD. R. and KeayB. F.: Proc. AWS Sheet Metal Welding Conf. VI, Detroit, MI, USA, October 1994, AWS, Paper No. E2.
6.
ZhangH.: Weld. J., 1999, 78, 373s–380s.
7.
MaC., BholeS. D., ChenD. L., LeeA., BiroE. and BoudreauG.: Sci. Technol. Weld. Join., 2006, 11, 480–87.
American Welding Society: ‘Recommended practices for test methods for evaluating the resistance spot welding behavior of automotive sheet steel materials’, ANSI/AWS/SAE/D8–9–97, AWS, Miami, ML, USA, 1997.
12.
DengX., ChenW. and ShiG.: Finite Elements Analy. Des., 2000, 35, 17–39.
13.
HaoM., OsmanK. A., BoomerD. R. and NewtonC. J.: Weld. J., 1996, 5, 1s–6s.
14.
SunX., StephensE. V., DaviesR. W., KhaleelM. A. and SpinellaD. J.: Weld. J., 2004, 83, 188s–195s.
15.
ZunigaS. and SheppardS. D.: in ‘Fatigue and fracture mechanics’, Vol. 27, ASTM STP 1296, (ed. R. S. Piascik et al.), 469–489; 1997, Philadelphia, PA, USA, ASTM.
16.
LiM. V., DongD. and KimchiM.: ‘Modeling and Analysis of Microstructure Development in Resistance Spot Welds of High Strength Steels’, SAE International, Warrendale, PA, USA, 1998.
17.
ZhangH., ZhouM. and HuS. J.: Proc. Inst. Mech. Eng. B, 2001, 215B, (3), 403–414.
18.
ZhouM., ZhangH. and HuS. J.: Weld. J., 1999, 78, 305s–313s.
