At Sun n Fun I questioned one of the exhaust pipe makers why
   the still
        welded the pipe to flange on the outside and he said they
   welded theirs
        both inside and outside but grind the weld smooth on the inside
   so you
        couldn't tell by looking at it. I asked him why because if it
   was going
        to crack it was still going to crack at the outside weld.
   Karibian



   Just because someone does something professionally doesn't mean that
   they can't be ignorant of the correct way to do something.
   Bill Jepson




Not sure that the reason given is not good.  But I can't assume that it
will always crack on the outisde if it is going to crack;  But if that
is the case, then the inside weld might be some insurance on this.  AND
..... welding inside can't hurt any.  Inside weld alone may suffice but
grinding down smooth could reduce some of the weld so it could crack. So
adding a  weld on the outside is added insurance.  And if the outside
cracks, the inside weld may still be good.

Hal


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