Problem:3/8 in. threaded rod through nut welded to outside of rectangular tube frame. Tube is ~2 in. x 3 in. with ~1/4 in. wall thickness. Ends, inside, and top of frame are not accessible. Nut is welded to short side. Threaded rod used to have "foot" attached . Rod has ~3 in. inside frame and 1 in. extending outside. Rod used to turn. Rod will not turn with vise-grips. All material is steel. Threads appear damaged. No corrosion.
ASCII ART (please use fixed-width font):
__________________________ _--| ^ _ -- ~ | | |~ | 3 in. | frame | | | tube | | | |_____V_____________________ | _-- __ ^ | _ -- ~ nut ---> / \ | 2 in. | ~ \__/ | _______________________| | _____V______ rod ---> | | |__|
Q1: How would you suggest to remove rod?
Q2: If it is decided to weld a big honkin' nut to the end of the rod to facilitate application of absurdly high torque values, what method of welding would you suggest?
Q3: What method of welding would minimize total heat into rod?
Then kew kindly for your assistance.