Scott,
I would never try and weld an
oil pan on the car. I am not afraid of it exploding, but I am 100% certain that you will never be able to clean all the
oil out of the crack. You will NEVER get a decent weld.
I have used JB weld in the past for such a repair. Clean the area up as best as possible with brake cleaner. Then apply the JB Weld to the area. Next spray brake cleaner on your (rubber gloved) finger and smooth outh the epoxy. It will look nice afterwards. An old engine builder showed me to apply it this way, and I have had good luck with it.
As soon as it starts snowing, you can remove the pan and do a weld repair. Removing the pan is the only way to do it right.
