Soyer BMK-16i Welding Studs with Flat Level Weld Base using the Radial Symmetrical Magnetic Field Process.
No need to use hammer, torch etc.
I tried everything until I successfully loosen my pin with craftsman impact wrench. Surely it saved me a lot of time, stressful labor, and frustration. Just let the impact work for 20-30 seconds and stubborn pins came off.