[Bebbetufs]

I've flipped through the entire body section of the workshop manual. There are several examples of changing the high tensile steel components. The manual specifies using gas shielded plug welds, so flux core is probably too hot. The manual does not specify which filler metal to use.

No examples of welding the ultra-high strength parts can be found, so they are not repairable.

Based on this I assume regular filler wire and careful attention to heat management should work well when welding most panels on the car.