Thank you Dr, D. I had read all the negatives on this, and never fully read the initial post. My error!
I had not read the type 316 part. So, I would still use a Weld-O-Let as described, but I would use type 309 as first chioce. type 312 as second chioce for the root passes. I would use 1/16" or 3/32"for the first few passes. (If there is not too much dripping, you could even use GTA welding). Make sure that there are no weep holes after each pass. If there are any, try to close them with a pin punch, and put a short stripper pass over them. You must seal the root passes before you go to the fill and cover passes. You can even put the plug in temporarily to check the tightness of the weld after you have enough root thickness to prevent blowing the Weld-O-Let off or cracking things further..
It is not necessary to use type 316 electrode, because this is a temporary repair. I would prefer to use type 309 all the way.
Hello,That is how we have been repairing leaks in large water pipelines for years,grab a redwood 2x2 stake that is tapered drive it into the leak,it swells enough to let you weld a coupling onto the pipe and put a plug in the coupling,Map it and when the line is down replace the piping,we do the same on minor steam leaks if the pipe is not too thin we peen the leek and weld threadolets then put a plug in it,works on hydraulics too,Jim
THAT'S what I do on the ammonia lines to (the weld-o-let and the plug) after we check the thigness on the material.
Thank you all. I thought they were nuts for asking personally, but I wanted to ask some peers their thoughts.
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I'd start taking bets on how many times it takes a guy to get that first thread started on this one.;-)