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I had to remove a piece of pipe from a fitting in a one-pipe steam system and it wouldn't budge so I cut it off next to the fitting and cut into the remaining stub of the pipe inside the fitting in three places and then chiseled the old pieces out. Done this many times before with no problems but this time I accidentally cut too deep and one of my cuts ended up going all the way through the threads inside the fitting I am trying to save.
I don't want to replace that fitting too, so I am wondering if I can fix this by epoxying a nipple in the damaged fitting with JB Weld. It is residential steam operating at under 2 PSI, but the damaged area is also low so condensate will be flowing past it as well.
Will JB Weld work? Is there any other product that I can try? I recognize that such products may render the nipple impossible to remove in the future but that is probably not a problem given its location. At this point replacing the damaged fitting would be more problematic, especially if JB Weld or something similar could do the trick.