Aii this, can I weld this, can I weld that. You can weld anything but the crack of dawn, with the right rods and skills. The question is the project worth the trouble. That part is not worth it. A good steel part is your best bet. Welding cast steel brings to much carbon to the weld and makes the area around the weld to brittle. You can preheat and post heat , but there you go, a lot of trouble for what you get. And the problem is, the original part isn't strong enough to begin with.
My .02. Please no hate here, just a comment.