Yes indeedy, and cover up the seals and windows too when you do it.
I've set my car on fire many a time from welding, strangely satisfying though... :hmm: :laff:
Also, not sure if you will find the same thing, but when I did it (not on a corolla) I ended up with a fairly large gap between door top and lip where gutter was. And the roof is sort of 'in' compared to the door looking down. So you might want to add steel to make it look right, if I'm making sense :cool: