If the weld is well "tribally" done, it's not a problem for me.Look at this one:
http://lulef.free.fr/html/tk_gbaya_4.html
It has a big repair with a piece of metal and that does not ruin the value to my eyes.It's one of my favorite knife in my collection.
Give us some pics of the weld.
Of course it's depend on the price you paid for it...but Flavio is right this kind of piece is rare, and will you be able to find another one ?
Luc