Hi David,
I've encountered those cracks more than once, always on the driver's door. I've wondered if the flexing of the interior rubber window seal has something to do with it. It's attached to the door card, and the door card hangs from that sheet metal.
I've always just drilled a 1/4" hole at the tip of the cracks. This stops them from propagating any further.
Although I'm capable of welding the cracks, I hesitate to do it because I'm not able to determine and remove the condition that caused them. I think it's possible that the cracks relieved whatever stress had initiated them, and the panel may perform better with the added flexibility provided by them.
I guess time will tell.
regards, Peter
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