Evaluation of Tensile Shear Strength for Lap Joint of Dissimilar Steels

Abstract:

The influence of different thickness combinations was investigated on the strength of the lap joint of dissimilar steels. In this study, lap joints of dissimilar steels were welded by laser welding. The tensile shear test was conducted for the lap joints. Rotational deformation process around the weld bead of the lap joint was observed by a digital video camera during the test. Motion analysis from the video of the tensile shear test indicated that the rotation angle around the weld bead was reduced by overlapping higher strength grade steel. Three-dimensional elastic-plastic finite element analysis was performed for the tensile shear test of the lap joint. The numerically calculated deformation behavior of the lap joint subjected to tensile shear loading showed reasonable agreement with the experimental record. It was found that the rotation angle was reduced and tensile shear strength of the lap joint increase by overlapping higher strength grade steel sheet.

• Periodical: Materials Science Forum (Volume 1016)
• Pages: 1454-1459
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1016.1454
• Online since: January 2021
• Authors: Yasuhito Takashima*, Tomo Washio, Fumiyoshi Minami
• Keywords: Dissimilar Joint, High Strength Steel Sheet, Laser Welding, Tensile Shear Test

References

[1] Y. Takashima, F. Minami, Numerical Analysis of temperature rise during dynamic loading for dissimilar steel joint specimen, Mater. Sci. Forum. 941 (2018) 280–286.

DOI: 10.4028/www.scientific.net/msf.941.280

[2] Y. Takashima, Y. Ito, F. Lu, F. Minami, Fracture toughness evaluation for dissimilar steel joints by Charpy impact test, Weld World. 63 (2019) 1243–1254.

DOI: 10.1007/s40194-019-00752-x

[3] M. Ono, M. Kabasawa, M. Ohmura, Static and fatigue strength of laser welded lap joints, Quart J Jpn Weld Soc. 14 (1996) 586–591. (in Japanese).

DOI: 10.2207/qjjws.14.586

[4] T. Terasaki, T. Kitamura, Prediction of static fracture strength of laser welded lap joint by numerical analysis, Quart J Jpn Weld Soc. 21 (2003) 419–424. (in Japanese).

DOI: 10.2207/qjjws.21.419

[5] M. Furusako, Y. Miyazaki, Y. Akiniwa, Tensile shear strength of laser lap joints, Quart J Jpn Weld Soc. 31 (2013) 222–229. (in Japanese).

DOI: 10.2207/qjjws.31.222

[6] M. Matsushita, Y. Kitani, R. Ikeda, M. Ono, H. Fujii, Y.D. Chung, Development of friction stir welding (FSW) of high strength steel sheet, Quart J Jpn Weld Soc. 27 (2009) 360–370. (in Japanese).

DOI: 10.2207/qjjws.27.360

[7] Y. Takashima, Y. Aoki, H. Fujii, F. Minami, Effect of specimen thickness on tensile strength for friction stir welded lap joints of a cold-reduced carbon steel, Prepr Ntl Mtg Jpn Weld Soc. 104 (2019) 26–27. (in Japanese).