Wilton 4" Vise - Main Screw

Good American Solid Steel! The welding blob is not a failure -

but rather a product of the manufacturing process. The two pieces are machined from different diameters of stock and joined by "Friction Welding" where the pieces are rotated against each other until red hot, and then forced together as a "forge weld". The excess is machined off. Some are cleaner than others.

Done