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Cleaning the tubing is very important to make a clean weld with stainless. Also make sure you purge the inside of the tubing with argon before you start welding. Some guys use foam or aluminum foil to block off the ends of the tubes and flow argon into the tubing with a separate argon line. This will help the inside of the tube to be smooth like the outside and have minimal chance for leaks. We ran out of time to put a small bead roll on the ends of all the tubing. This helps the stainless tube from popping off the hose.