some good advice, mostly speculation
Take the part to a machine shop and ask them if they can repair it and how much it will cost.... Ask them if that's not possible, how much to make a new one. In either instance you will have hard and fast info, no speculation.
Brazing is an option which I used on a broken cast iron part and it worked wonderfully. Brazing is a low temperature solution, in which rather than melting the parent metal you add a filler metal which melts at a lower temperature. A machinist will know if that is a viable solution.
The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)