Experimental investigation of mechanical behaviour and optimization of GTAW process parameters on dissimilar titanium and aluminium alloy joints

Abstract

Modern day world prescribes a lifestyle that advocates shedding of weight without compromising strength and industries too have taken this doctrine religiously into their manufacturing ethics that today we have aerospace, automobile and chemical components manufacturing industries that are hell bent in attaining high strength with low weight components. To realize this dream they have found out a few components that have brought a renaissance in the manufacturing field. Titanium alloys offer a number of advantages to achieve high strength, corrosion and weight properties. Now-a-days titanium alloys has become the part and parcel of industries which prefer to improve the strength with lesser weight. In addition, Aluminum alloys have become an inevitable ingredient in many components in various industries for its reduced weight and optimum strength thereby making it a much sought after and most desired component in the modern-day industry. Titanium and aluminum alloy dissimilar joints are amenable to hydrogen-induced cracking in HAZ leading to heat affected zone softening post joining which will trim down the ballistic performance. Considering the criterion mentioned above, a careful selection of the suitable welding process and consumable are required to keep the problems at bay. Aluminum (Al4047) welding consumables are preferred for joining titanium alloy (Ti-6Al-4V) and aluminum alloy (Al7075), owing to their greater solubility when compared to titanium consumables which may create HIC, micro structural issue in heat affected zone and inter metallic formation. newline newline newline