Another welding cast iron thread

[Catoosa]

Here are a few photos of what I am dealing with. The large pieces are the fertilizer shoots. At first I thought the right one had a piece missing to the left of the mounting tab but after taking the one that was broken off I can see it didn't have a tab on the left side. The smaller piece is an end bearing for the wheel axle shaft. The mounting tab is broken into two pieces. So it looks like I have all the parts for the two that need fixing.

My original plan was to sand blast them clean using Black Beauty coal media but after reading about not using a grinding wheel on cast not sure that is a good idea?

Appreciate the tips so far, not sure if seeing the photos will change anything..

 

[Catoosa]

Also trying to decide if I want to make an attempt to fix the bolt hole that is broken out on this wheel. I do not have the piece that broke but thinking I could cut a piece of iron pipe to fit and weld it in. It will work as is, the hole on the other side is OK and was used with this broken.