Welding is one of the greatest and most suitable procedures for producing complicated things for aerospace, naval, and automotive components. Due to service needs and the complexity of load acting, manufacturing organisations are forced to blend materials of various types. Effective welding techniques are therefore necessary, as is understanding of flaws and their repercussions. In this study, the viability of combining two dissimilar aluminium alloys has been investigated utilising two distinct welding processes: friction stir welding (FSW) and TIG welding. The two aluminium alloys AA5083-O and AA7075-T651 were successfully welded together using weld currents (80-120 amp for TIG and 800, 1000, 1100, 1200, and 1400 rpm with constant traverse speed for FSW). An attempt has been made to study the effect of joining technique on EM wave properties of dissimilar aluminium alloy joints. Further, TIG welded joints were characterized for pitting corrosion behaviour