An alignment mechanism for replacement of a hub to a torque converter in order to weld the same utilizing a rotatable base member. A vice is employed and is supported by the base member. The vice has a plurality of jaws each including a multiplicity of flat surfaces. A particular flat surface of one particular jaw is co-planar with a flat surface of another jaw such that a torque converter impeller placed on the vice jaws would lie a plane. A shaft extends outwardly from the base member and lies on an axis that is perpendicular to any of the jaw flat surfaces or the planes formed by such flat surfaces. The shaft also passes through the hub and the torque converter impeller. The hub is held to the torque converter impeller when the welding process takes place.