7.25 axle tube thickness

I picked up a BBP 7.25 for when I do my disc brake conversion. I didn't notice that spring seat was full of mud when I bought it. After digging the mud out, I found the tube pretty rusty and pitted under the spring seat. How thick are the tubes? Considering having the seat taken off and welding it up, but concerned about warpage. Doesn't appear to be leaking. I'd take some pics, put really can't see in there.