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Effects of Load Secondary Voltage on Resistance Spot Weldability of Dissimilar Metals Joint between SUS316L and J4

Abstract

Solar panels are usually placed in open spaces like the roof of a house or building. Stainless steels are used for its supporting components due to an excellent combination of strength and corrosion resistance. However, a high nickel cohtent in conventional stainless steel is expensive and not environmentally friendly. Low nickel stainless steels such as J4 have been developed to meet economic and environment reasons. In application, partially of conventional stainless steel by low nickel stainless steel makes dissimilar materials joint case. In this study. the influence of the primary welding parameters affecting the heat input such as load secondary voltage on the morphology, microhardness, and tensile shear load bearing capacity of dissimilar welds between SUS316L and J4 has been investigated. It was found that the tensile shear load bearing capacity of welded increases with an increasing load secondary voltage due to the enlargement of nugget size. Although, an acceptable joint strength was obtained at 2.02 volt, the optimum welding parameters producing maximum joint strength were established at a voltage of 2.67 volt, where the electrode force and weld time were constant. jparaaaing load secondary voltage changed failure mode from interfacial fracture to pullout fracture of J4 sheet metals.

Keywords: resistance spot welding, dissimilar metals joint, scondary voltage, SUS 316L, Jindal Stainless Steel J4.<!--[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>