Joining of aluminium and its alloys are always a major challenge to welding community because of high thermal conductivity, coefficient of linear expansion, affinity to combine with oxygen and sensitive to hot cracking. Ample of researches carried out to address above issues. The selected investigation aimed at one such attempt to combine AA2114 and AA 7075(AA2XXX and AA7XXX series promises a lot in aircraft applications) in all possible ways i.e. similar and dissimilar by adopting TIG (Tungsten Inert Gas) and CMT (Cold Metal Transfer) welding. After series of trials, all the combinations welded successfully and tensile specimen as per ASTM E8 machined. While performing mechanical testing, all specimens failed along the interface of weld zone and AA2114 side irrespective of TIG/ CMT dissimilar welding. This is accounted to softening in the heat affected zone of selected heat treated alloys i.e. AA2114 and AA7075. Among all the fabricated weld joints AA 2114-AA7075 specimen showed highest ultimate tensile strength of 247 MPa using filler ER 4043 alloy with CMT welding. Yielding of above outcome may be due to segregation of alloying elements (acts barrier to dislocation motion) and low concentrated heat input (favoring maximum extent of finer dendritic equiaxed grains).XRD-report revealed the presence of Zn, Cu, Mg elements in the intermetallic to have strength in CMT dissimilar CMT weldment. SEM analysis report on dissimilar joints of both TIG and CMT exemplifies the presence both dimples and flakes, which led to the ductile–brittle mixed mode nature of failure.