No heat yet but I might be able to get a Mapp torch on the alternator ear where the bolt is threaded. I'll look into that.
A pipe wrench isn't going to work. The head is one of those bolts with a built in 'washer' at the bottom so it has a slight taper to the bolt head. Plus 8" of torque isn't going to cut it. I've put a fair amount of muscle into it with an 18" breaker bar and it hasn't budged. It took the 18" breaker bar to get the nut on the AC adjuster system to loosen up also. Must have been a hefty guy who last cranked them down.
I'll see if I can find some Kroil at the parts store.
Welding may be possible but I'm a little concerned about welding on the alternator bracket.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13