The weld bead looks very "Mig" like, which it is common to have brittle area
like this. Likely you can take it to any good welder, and have it rewelded and
fixed. I do a good bit of oxy/acetylene, and would not hesitate to reweld it
myself if it were mine. Then just make it a periodic inspection item. You'd
likely never have another problem there.
Oxy/Acetylene, or Tig would be easy to fix this with.
Jeff