In an earlier contribution to this discussion,
Dave Plowman (News) wrote:

I need to remove part of the exhaust on the old Rover to fit an oxygen
sensor boss. One end of the part disconnects easily - its a flange
coupling - but the other is the type where one pipe fits inside the
other to allow some adjustment for length. Which is then clamped.
It's a SS system and looks clean - so at least shouldn't be rusted up
solid as steel ones do. The car is on axle stands so access is a bit
restricted.

I was wondering about grinding an SDS chisel blunt and seeing if the
hammer action works like an air chisel?

I assume you want to part it non-destructively?

If it's stuck together, the best way of unsticking it is to rotate one part
relative to the other by a few degress, rather than trying to drift it
apart. You might be able to grip it to rotate it by using a strap wrench -
intended for unscrewing oil filters.
--
Cheers,
Roger
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