Slide on a pair of work gloves, safety glasses and a welding mask to protect your skin and eyes.
Clean the top of your rear bumper frame with a microfiber cloth.
Measure the center of the bumper. Mark the center spot with a marker.
Place a 2 5/16-inch stainless steel hitch ball atop the mark.
Attach a E6013 mild-steel electrode rod to a 120-volt AC welding torch with grounding clamp. Connect the clamp directly to the metal bumper.
Plug the torch into an outlet -- and an extension cord, if necessary -- to power the tool. Ignite the torch. Touch the electrode rod to the connection point between the hitch ball and the bumper. Weld the entire circumference of the hitch ball in the same manner to complete the process.