Rosette weld and patch exercise

admin

'm practicing with an Ox/Ac rig; Using mild steel (.035).Got a little cocky and decided to try a patch on tubing. With arosette weld as well as along the edges.Well, I chased that hole all over the patch! burning it and fillingand burning and filling! The patch obviously getting hotter than thebase metal. Tried different angles, nothing successful. Anysuggestions are appreciated.Had the same problem along the first edge. Then I wised up and clampeda 'chill bar' on the patch. Worked like a charm; however, I can't seean experienced welder stopping for each side and reclamping the 'bar. I'm using 2psi of both gases, and a blowpipe tip with an openingappropriate for metals .037 thick.Suggestions? - Mike
Reply:>>>and a blowpipe tip with an openingappropriate for metals .037 thick>>and a blowpipe tip with an openingappropriate for metals .037 thick<<<Does this mean you left an opening in the tubing or were the ends of the tube closed off while you were welding the patch and hole?  In other words, were you welding on an otherwise closed pipe?