Rust in pinch welds

[Strat067]

Hoping someone can provide some insight. I am beginning to do major rust repair on the front frame rails and strut towers on my 240z. What I am noticing as I am stripping paint is some surface rust showing creeping around the weld flanges. An I able to sand blast the spot weld flanges and seal it up, or is it going to continue to rust through? Basically does this look like I need to keep cutting out strut tower and just pull off the frame rail completely?

[wheee!]

Your front frame rails may look like mine did behind the pinch welds...

 

I added new frame rails and rebuilt all the sheet metal.

 

[wheee!]

Old rusted stock...

New metal...

[Strat067]

Whoo I was hoping to not have to go that far. Nice work on yours. Guess I start cutting. I was hoping I was at the end of the cutting and could start patching.