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Low nickel stainless steel has been developed as a replacement for conventional stainless steel because it is cheap and environmentally friendly. Due to economic reasons, spot welded dissimilar metals between stainless steel J4 and low carbon steel have been conducted. It is generally more challenging than that of similar materials due to differences in the physical, chemical and mechanical properties of the base metals. In this study, the influence of the current on the morphology, microhardness, and tensile shear load bearing capacity of it has been investigated. Stainless steel J4 and low carbon steel with thicknesses of 1.2 mm were spot welded using the current of 4kA, 6kA and 8kA, The increasing of welding current increased the nugget size and tensile-shear load bearing capacity of the joint. It also changed the interfacial failure to pull out failure.

Keywords: dissimilar metals weld. resistance spot welding. stainless steel. low carbon steel<!--[if gte mso 9]><xml> Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 </xml><![endif]--><!--[if gte mso 9]><xml> </xml><![endif]--><!--[if gte mso 10]> <style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman","serif";} </style>