Experimental Investigation and Predict GTAW Process Parameters on AA6063

Abstract

This experimental tries to investigate the effect of process parameters like weld current, gas flow and work voltage on the Bead Geometry of the welded joint. The working range of the experimentation is decided by test experiments. For joining the work piece by TIG welding for AA6063 the process parameters play an important role. During experimentation it is found that, increase in the welding current result in increase in heat input. This increased heat is utilized to melt the base metal. Similarly as thickness of the work piece increases rate of gas flow need to be increased to increase the heat diffusion rate. Increase in gas flow avoids the vaporization of the molten metal. It also increases the penetration.  The increase in weld current and gas flow results in change in Bead Geometry of the welded joint which dominates the weld characteristics. The variations in the process parameters affect the mechanical properties with great extent.                  This paper made many attempts to test pieces to predict the process parameter of TIG for getting maximum weldment, good deposition, best mechanical properties and minimum HAZ. The planned experiments are conducted in the TIG welding machine and tests are carried out by the hardness testing, Internal welding defects through ultrasonic test, Bead geometry Analysis, Impact strength.