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A welding of dissimilar alloy gives an optimum combination of high strength of Ti-10V-2Fe3Al (Ti1023) and low cost of Ti-6Al-4V (Ti64). Three different fusion ratios of Ti1023 and Ti64 were resulting in a similar width size of the fusion zone (FZ) and heat affected zones (HAZ) whereas a thicker sample with the same fusion ratio generated a narrower size of FZ and HAZ. It resulted chemical composition in the FZ within a low β phase stability than in Ti1023, which allowed the precipitation of high hardness α” martensitic in the as weld condition. In the HAZ of Ti1023, αs transformed into β phase, which reduced the hardness and strength. Vickers hardness measurements confirmed the HAZ of Ti1023 was the softest area whereas the FZ was the hardest area. Consequently, in the as weld condition, the fracture occurred in the HAZ of TI1023 after the tensile test.