SteveB wrote:
snip
There are some things that robotic welding has over humans. They travel at
an exact speed. On starting a weld, they may have a pause time, or may even
be moving before the arc is struck. When everything is right, higher heat
can be used with less chance of burnthrough. Rule is that the better a
weldor is, the higher heat he can run on the same materials with the same
rod.

Not to mention that once programmed, in general, curve following is
as easy as doing straight welds.
Few weldors can go at the same speed on tube welds as straight.