I would do what Arthur suggested AND spray the whole mess with some sort of penetrating spray (after the weld has cooled sufficiently to be NOT flamable).
Treat the area a few times over the course of a day or two with the penetrating fluid and then try to get the bolt out.
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Daily Driver: 02 E430 4MATIC
In the family: '03 E500 // '04 ML500 // 64 220SE
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