I have a cast iron muffler on a diesel lawn tractor with a crack. I don't handle cast at work and have never dealt with it in the past. Rather than shell out $400 for a new one, I'd like to try to repair this one first. I know cast is pretty sensitive to heat change. I'm looking for some advice on repairing this thing. It's not in a high stress area. I have a cheap little HF stick/tig here, but I have a lincoln square wave tig that will also do stick. Everything I do is mig, tig, or sub arc, so stick is bit of a gray area for me. I also read that brazing is a possibility? Any info is greatly appreciated. Thank you!

Pete