Experimental Research on Tensile-Shear Behavior of Spot-Welded Lap Joints of Ultra-High Strength Steel


Article Preview

The ultra-high strength quenched 22MnB5 steel is researched in this paper, the intermediate frequency inverter & electric servo welding gun system is used to weld the sheets, experiments included of tensile-shear with synchronous electrical testing, microstructure of the material and fractures analysis and the Vickers-Hardness testing. The results point out that the maximum hardness is located at weld nugget, and the minimum hardness is appeared in heat affected zone (HAZ). Fracture is formed under the combined effects of shear stress and normal stress, the shear stress contributes to interfacial fracture, and leads to rupture. Non-uniformity of the microstructure caused by spot welding, changed the property of the material in nugget, stress-strain relationship of this area is nonlinear. The results also show that the conventional weld size guidance of 4√t is not sufficient to produce nugget pullout failure mode for 22MnB5 UHSS spot welds.



Edited by:

Chunliang Zhang and Paul P. Lin




Y. H. Liu et al., "Experimental Research on Tensile-Shear Behavior of Spot-Welded Lap Joints of Ultra-High Strength Steel", Applied Mechanics and Materials, Vols. 226-228, pp. 1720-1724, 2012

Online since:

November 2012




[1] C.M. Xu and W.L. Li: Petroleum & Petrochemical Today, Vol. 18 (2010) No. 1, P. 54. (In Chinese).

[2] N. Han and G.M. Qiao: Forestry Machinery & Woodworking Equipment, Vol. 39 (2010) No. 9, P. 54. (In Chinese).

[3] B.H. Chang, Y.W. Shi and S.J. Dong: Journal of Mechanical Strength, Vol. 20 (1998) No. 4, P. 271. (In Chinese).

[4] X.X. Xie, H. Xue and Q.Z. Su: Automotive Engineering, Vol. 27 (2005) No. 5, P. 619. (In Chinese).

[5] X.X. Xie and Q.Z. Su: Journal of Jiangsu University(Natural Science Edition), Vol. 27 (2006) No. 4, P. 351. (In Chinese).

[6] Y.R. Wang, J.C. Feng and Z.D. Zhang: Electric Welding Machine, Vol. 39 (2009) No. 9, P. 54. (In Chinese).

[7] H.P. Li, G.Q. Zhao, L. Zhang and L.F. He: Journal of Shandong University (Engineering Science), Vol. 40 (2010) No. 3, P. 69. (In Chinese).

[8] S.J. Chen, Y. Yu, C. Wang and Z.Y. Lu: Electric Welding Machine, Vol. 40 (2010) No. 5, P. 70. (In Chinese).

[9] R.J. Wang, D.G. Shang, T. Shen and C.L. Yan: Mechanics in Engineering, Vol. 28 (2006) No. 3, P. 9. (In Chinese).

[10] X.S. Jiang and H. Zhao: Manual of Microscopic Fracture of Steel (China Machine Press, China, 2010).

[11] X. Sun, E.V. Stephens, R.W. Davies, M.A. Khaleel and D.J. Spinella: Welding Journal, Vol. 83 (2004) No. 11, P. 308.

[12] X. Sun, E.V. Stephens and M.A. Khaleel: Engineering Failure Anlaysis, Vol. 15 (2008) No. 4, P. 308.