The most note worthy strength-to-weight proportion measure has intrigued expanding interest in for all intents and purposes all regions where weight lessening is irreplaceable. .One of the later progresses in fabricating endeavoring on accomplishing this deliberate charms grinding mix welding (FSW). The method is broadly utilized for joining compa-rable and disparate non-ferrous materials. In FSW,mechanical properties of the weld joints are induced by property chosen prepare parameters. This paper presents decisions of ideal prepare parameters on endeavoring to achieve upgraded mechanical properties of the weld joint. The test was conducted on a 4 mm 6061 aluminum with 4mm 1020 mild steel sheet. Butt joint setup was utilized. Prepare parameters; rotational speed, navigate speed or nourish rate, pivotal constrain, stay time, instrument fabric and apparatus pro-files were utilized. Prepare parameters moreover optimized making utilize of blended L18 orthogonal cluster and Dark connection investigation strategy with a bigger is way better quality characteristics. Mechanical properties of the weld joint are inspected by implies of Rockwell hardness test and tensil strength test. ANOVA was conducted in arrange to explore the noteworthy handle parameters. From this inquire about, tool rota-tional speed, tool pin profile, travel speed and, tool types of materals and navigate speed gets to be noteworthy with a joint proficiency. This corroborative tests are conducted, and the comes about demonstrate that the normal values of the dark social review drop inside the 99% certainty interim, subsequently the try is demonstrated dependable. Keywords: Tensile strength, hardness, grey based, taguchi methods; dis-similar metal friction stir welding; aluminum alloy, mild steel.