Metall. Res. Technol.
Volume 115, Number 6, 2018
|Number of page(s)||10|
|Published online||11 December 2018|
Dissimilar resistance spot welding of AISI 304 to AISI 409 stainless steels: mechanical properties and microstructural evolutions
Department of Mechanical Engineering, Arak University of Technology,
2 Department of Materials and metallurgical Engineering, Faculty of Engineering, Arak University, Arak, Iran
3 Department of Mechanical Engineering, Islamic Azad University-Khomein Branch, Khomein, Iran
* e-mail: firstname.lastname@example.org
Accepted: 5 June 2018
In this work, dissimilar resistance spot welding of austenitic stainless steel sheet (304 grade) and ferritic stainless steel sheet (409 grade) is studied experimentally. For this purpose, the effects of process parameters such as welding current, welding time and electrode force on tensile-shear strength of resistance spot welded joints are investigated with response surface methodology (RSM). Also, microstructural evolutions during resistance spot welding process of AISI 409 and AISI 304 stainless steels are evaluated by optical microscopy. It is concluded from results that the tensile-shear strength of spot welds is increased with increasing the welding current, welding time and electrode force. It is shown that widmanstatten ferrites have been grown in the weld metal of dissimilar resistance spot welds of AISI 304 and AISI 409 stainless steels.
Key words: dissimilar resistance spot welding / austenitic stainless steel 304 / ferritic stainless steel 409 / tensile-shear strength / microstructural evolution
© EDP Sciences, 2018
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