OK,
Here is the completed tank. Looks ugly but does not leak. I know it would be a lot better with non-corner welds like some have suggested, but I don't have equipment for that. Willie was the winner with his "turn up the gas" tip. I went by the book settings which said to run 10 CFM of Argon, but it turns out that it really needs a lot more. My gauge only goes up to 25 CFM and that is where the weld puddles were happy.
Thank you to everyone for their great tips. My next tank will be a lot better now.
Don