本发明公开了一种TA18钛合金无缝管坯的制造方法，其壁厚均匀、组织均匀且无裂纹。包括如下步骤：A、TA18钛合金锭在β相区开坯锻造后，在α+β相区十字墩拔锻造制得TA18钛合金棒材；B、在TA18钛合金棒材中开孔制得TA18钛合金无缝管坯；其中，步骤B中，通过电火花在所述TA18钛合金棒上穿孔形成沿轴向贯通所述TA18钛合金棒材的穿丝孔，在所述穿丝孔中穿入通电的电极丝，沿设定路径移动电极丝或转动TA18钛合金棒材使二者相对运动而在钛合金棒材中切割出一个圆柱体，切割后的TA18钛合金棒材即形成空心管状的TA18钛合金无缝管坯，所述设定路径为圆心位于TA18钛合金棒材轴心线上的圆且该圆所处平面与TA18钛合金棒材的轴心线相互垂直。

The invention discloses a manufacturing method for a TA18 titanium alloy seamless tube blank which is uniform in wall thickness, uniform in texture and free of cracks. The manufacturing method includes the following steps that A, after a TA18 titanium alloy ingot is subjected to hammer cogging in a beta phase region, the TA18 titanium alloy ingot is subjected to cross upsetting and stretching forging in an alpha+beta phase region, and a TA18 titanium alloy bar is obtained; B, a hole is machined in the TA18 titanium alloy bar to obtain the TA18 titanium alloy seamless tube blank, wherein in thestep B, the hole is machined in the TA18 titanium alloy bar through electric sparks, a wire penetrating hole axially penetrating through the TA18 titanium alloy bar is formed, an electrified electrode wire penetrates into the wire penetrating hole, the electrode wire is moved along a set path or the TA18 titanium alloy bar is rotated so that the electrode wire and the TA18 titanium alloy bar canmove relatively to cut out a cylinder in the TA18 titanium alloy bar, and the cut TA18 titanium alloy bar forms the hollow tubular TA18 titanium alloy seamless tube blank. The set path is a circle with the circle center located on the axis of the TA18 titanium alloy bar, and the plane where the circle is located is perpendicular to the axis of the TA18 titanium alloy bar.