The effect of welding conditions according to mechanical properties of pure titanium

This study investigates the effect of welding condition according to mechanical properties of pure titanium and presents the optimum welding condition through the evaluation about the weldability of pure titanium by the welding conditions such as the welding pass, the amount of shielded gas and the welding time interval. In order to find out optimum welding condition by the mechanical properties of pure titanium, the annealed pure titanium of the ASTM B265 grade 2 is selected as a specimen and is classified by several welding conditions. And then, the experiments performed the test of tension, impact and hardness under the welding condition, respectively. The experimental result revealed that the specimen of 4-pass has the highest tensile strength in case of the welding pass condition. And, in case of the shielding gas condition, the tensile strength and elongation occurs the highest to the specimen of 25 l/min. The hardness value at the HAZ (heated affected zone) is higher than that for the WMZ (welding metal zone) and reveals almost the constant value more and more distance at the HAZ. Also, the impact absorption energy shows the high tendency by an increase in the number of pass.