Kesan Bentuk Hujung Elektrod Terhadap Kimpalan Rintangan Bintik Mikro Sambungan Titanium‐Nikel

Micro resistance spot welding of dissimilar materials is more challenging than that of similar materials due to differences in physical and chemical properties of the base metals. Fortunately, the incorporation of filler alloys at the interfaces of the two overlapped dissimilar metals can successfully overcome this difficulty. This study evaluated the mechanical behavior and microstructural characteristics of titanium-to-nickel spotwelded with and without the incorporation of 71Ag-28Cu-1Mg using round, rectangular and ring-shaped tip electrodes. Results showed that the round electrode gave the joints with the highest failure load and microhardness values since its highest current density produced a smaller contact area with the workpieces, causing the deepest penetration of the welded nugget. Addition of Ag-Cu-Mg alloy filler during spot welding improved weldability over that of joints made without filler.