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You can buy that flanging tool attachment that Jerry is talking about from Amazon. When I learned to replace panels in trade school back in the sixties, the school had one of those flangers. Back then MIG or TIG was not in the picture so we would braze the joint using an oxy-acetylene torch. This would fill the joint so it didn’t create an crevice on the backside for rust to start. My teacher showed us the you could tap down a standard lap joint flush while it was still red hot and accomplish the same result with a bit of practice. That put allot of heat into the panel so you would use a rag soaked in water to cool as we progressed.

There was a recent post from Jon G that used the flanging tool but used a special type of low temperature solder to fill the joint. This sounds interesting as you would wouldn’t need nearly as much heat.

https://www.stovebolt.com/ubbthread...mig-welding-sheet-metal.html#Post1323272

https://www.amazon.com/Tool-Aid-916...r&qid=1567597254&s=hi&sr=1-4