Here's pics of the methods I mentioned. these are extreme closeups of 1/35 Tiger.
The first is of the rough weld on the lower plate, with my basecoat sprayed:
The second is the 'indentation' weld on the turret. The roughened outer steel is to represent the torch cutting marks during construction. This weld hasn't been cleaned up yet and also shows the bit used:
I forgot to mention...a flex shaft on the dremel makes this a lot easier and also slows the bit down even more.
Hope this helps.