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That elbow looks like an overfill waiting to happen.I just found this hairline crack on my 14b ff ... it's on the top side of the filler (pipe fitting pictured).
Is this something I can drill holes at the ends then braze and be ok? I'm just not sure why it's there in the first place, is that a stress point???
MAYBE a 6010 first pass for good penetration and a 7018 capIf I was going to fix this, the first thing I would do, is a spark test to ID what the metal is for sure. It mite be cast steel. If so, then it can be welded with 7018 stick welding rods, or 70s6 wire or tig wire. But here is the thing. First off, yes drill a hole on each side. Then preheat the part, then weld and let cool very slowly. Then add a gusset for support. It cracked for a reason ( touch stress) so it needs extra support. There are videos in youtube about the spark test. If you do braze this, that may work for a while, but would be the weakest type of welding repair.