There are multiple ways to do this. This is a way I’m having success with. If you simply harp on it, the hex cut in the link can strip right out, and if you put an impact on it, the ball will just spin. Sometimes you can hold the ball with vice grips while impacting the nut off.
I found it was easier with this car to slice the links with an angle grinder and then remove the bar all together. I was doing links and bushings either way. (2009 Subaru Forester).
Steps:
Heat
Rust Penetrant
Break flange nut loose from surface (important)
Turn with wrench and hex bit/allen
Rejoice
https://MidwestFasteners.com #7 in a series, this video shows welding with the Capacitor Discharge Stud process for C.D. Weld Pins and C.D. Stud sizes. On screen demonstration is made of this stud welding process, stud welder parts & components, leading up to welding operation this high speed process. Popular types of Weld Pins and Weld Studs are shown with installation techniques.
Midwest Fasteners, Inc., an industry leader in the manufacture and supply of Stud Welding products, shows the preparation for Stud Welding with “C.D.” Welding Equipment. From steps in the process, to components of the welder, as well as demonstration of actual C.D. weld gun set up are shown in an easy to follow set of steps for both Capacitor Discharge Weld Pins and Weld Studs. With products and services “Made in the U.S.A.”, Midwest Fasteners can be your single source stud welding specialists.