In current research work, dissimilar aluminium alloys such as AA5083, AA6081, AA6082, and AA7039 are butt joined by employing friction stir welding (FSW). The present study explores the effect of material positions of aluminium alloys (i.e., advancing side (AS) and retreating side (RS)) on the mechanical and metallurgical properties of FS welded dissimilar aluminium joints. The performance characteristics of the present study are analyzed in terms of mechanical and metallurgical properties. It is concluded that maximum strength is obtained for all the joints in which higher strength aluminium alloy is placed on the AS ((i.e., 386 MPa for AA7039-AA5083, 343 MPa for AA7039-AA6082, 320 MPa for AA5083-AA6082, and 225 MPa for AA6082-Aa6061). Furthermore, two types of macrostructures (i.e., banded and an onion ring) are observed at the nugget zone (NZ) of all the welded joints during metallurgical analysis. Besides this, energy-dispersive X-ray spectroscopy (EDS) analysis at NZ of FSW joints is also carried out to find out the chemical composition at NZ. It is observed that the key element of AS material is high er in weight percent as compared to RS at NZ. Moreover, tensile fractured surface locations are also analyzed to understand the process better. It is witnessed that most joints are fractured at heat affected zone (HAZ) on the lower strength material side.

在当前的研究工作中，采用摩擦搅拌焊接（FSW）对接不同的铝合金，例如AA5083，AA6081，AA6082和AA7039。本研究探讨了铝合金材料位置（即前进侧（AS）和后退侧（RS））对FS焊接异种铝接头的机械和冶金性能的影响。根据机械和冶金性能分析了本研究的性能特征。结论是，在AS上放置了更高强度的铝合金的所有接头均获得了最大强度（即，AA7039-AA5083为386 MPa，AA7039-AA6082为343 MPa，AA5083-AA6082为320 MPa，225 AA6082-Aa6061的MPa。此外，两种宏观结构（即，在进行冶金分析时，在所有焊接接头的熔核区（NZ）处观察到带状和洋葱圈）。除此之外，还对FSW接头的NZ进行了能量色散X射线光谱（EDS）分析，以找出NZ的化学成分。可以看出，与NZ的RS相比，AS材料的关键元素的重量百分数更高。此外，还对拉伸断裂的表面位置进行了分析，以更好地了解该过程。可以看出，大多数接头在强度较低的材料侧的热影响区（HAZ）处断裂。可以看出，与NZ的RS相比，AS材料的关键元素的重量百分数更高。此外，还对拉伸断裂的表面位置进行了分析，以更好地了解该过程。可以看出，大多数接头在强度较低的材料侧的热影响区（HAZ）处断裂。可以看出，与NZ的RS相比，AS材料的关键元素的重量百分数更高。此外，还对拉伸断裂的表面位置进行了分析，以更好地了解该过程。可以看出，大多数接头在强度较低的材料侧的热影响区（HAZ）处断裂。