Welding Current Dependence of Dynamic Mechanical Properties for Spot-Welded Electric Arc Furnace Steel Sheet

Masaaki Itabashi

doi:10.4028/www.scientific.net/KEM.715.80

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 715Welding Current Dependence of Dynamic Mechanical...

Welding Current Dependence of Dynamic Mechanical Properties for Spot-Welded Electric Arc Furnace Steel Sheet

Abstract:

In 2012, a novel production line was developed to produce electric arc furnace steel sheet for automotive structure, as a national project in Japan. From the viewpoint of crashworthiness, the evaluation of joint strength under dynamic loading is essential. In this study, single-lap spot-welded joint specimens are prepared with the variation of welding current. The specimen sheet is 980-MPa grade electric arc furnace steel and 1.0 mm in thickness, which is supplied by Tokyo Steel Co., Ltd. Nugget diameter is recommended by a well-known empirical equation, , where is sheet thickness. The nugget diameter can be adjusted mainly by welding current. In order to find the optimum nugget diameter under dynamic tensile-shear, five values of welding current, 6.1, 6.4, 6.7, 7.0 and 7.3 kA are tried. The values are set for the recommended nugget diameter 5.00 mm, and ±5% and ±10% of the recommended diameter. Experimental results of quasi-static (loading velocity: 2.0 mm/min = 3.3×10^-5 m/s) and dynamic (initial loading velocity: 7 m/s) tensile-shear tests shows that, despite of loading velocity and welding current (equivalent to nugget diameter), tensile-shear strengths are almost constant. Absorbed energies up to the strength give complicated tendencies. At the recommended welding current (equivalent to mm), the most stable strengths and energies are obtained.

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Periodical:

Key Engineering Materials (Volume 715)

Pages:

80-85

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.715.80

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Online since:

September 2016

Authors:

Masaaki Itabashi*

Keywords:

Dynamic Mechanical Properties, Electric Arc Furnace Steel, Nugget Diameter, Spot Welding, Welding Current

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* - Corresponding Author

References

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