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?

[Strat067]

Dang, sorry for multiple posts. Can't figure out how to delete one. Man I am helpless