Influence of Plasma Gas Flow Rate on the Mechanical and Microstructural Aspects of Plasma Arc Welded Titanium Alloy Joints

In the present investigation, effect and role of plasma gas flow rate on formation microstructure during arc welding Ti6Al4V titanium alloy were studied using microscopic observation, energy dispersive spectroscopic analysis, tensile tests microhardness measurements. Plasma influences pressure, constriction, stability. The transformation from conduction mode to keyhole causes severe changes microstructural characteristics welds. This takes place with slight variations PGFR. Weld geometries increase an in examination shows that there are various phases formed variation Fusion zone had acicular α widmanstätten α. Mechanical properties (i.e) strength hardness joints rate. joint welded 1 L/min, is α-case which oxygen rich brittle subsurface structure found detrimental ductility joints.