In this paper, the effect of plasma arc welding (PAW) process parameters on the mechanical properties and macro- and microstructure of Ti-6Al-4V alloy is discussed. These parameters including welding current, welding speed, and plasma gas orifice diameter have an effect on the weld bead depth and width. Macrograph results indicate that there is a certain range of welding electric current and welding speed in which full-penetration weld is obtained and weld beads are free from defect. Experimental results show that the specimen mechanical strength is favorable and comparable to those of the base material, but the sample elongation is low entirely. Moreover, the results indicate that using an optimum range of welding speed and current, which lead to decreased heat input, makes greater mechanical strength and better relative ductility. The fusion zone microstructure consists of martensite (α′), massive α (α_m), acicular α, and retained β phase.

本文讨论了等离子弧焊（PAW）工艺参数对Ti-6Al-4V合金力学性能以及宏观和微观组织的影响。这些参数（包括焊接电流，焊接速度和等离子气体孔直径）会影响焊缝深度和宽度。宏观结果表明，在一定的焊接电流和焊接速度范围内，可以获得全熔透焊缝，焊缝无缺陷。实验结果表明，样品的机械强度良好，可与基材媲美，但样品的伸长率整体较低。此外，结果表明，使用最佳焊接速度和电流范围会导致热量输入减少，从而使机械强度更高，相对延性更好。_m），针状α和保留的β相。