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Norm, Thanks
for the info. I have only seen thick sections of HY-80 welded (and lots
of it!) which all required pre- and post-heat. Electric Boat switched to
robotic welders just prior to 1990 and the length of welds completed per day
went up drastically. All of these welds were multi-pass. Cracking
in the hulls was always an issue with the Sturgeon and earlier class
subs that utilized HY-80. R/Jay Respectfully, Jay K.
Jeffries Andros
Is., Bahamas A
skimmer afloat is but a submarine, so poorly built it will not float. -----Original Message----- Weldments of HY-80 are noted for good ductility, notch
toughness and strength. It is best welded using the metal-arc process
with low hydrogen electrodes of Type E-10018 or E-11018. Use approved weld
procedures so as to not apply too much heat input per inch of weld bead,
which would otherwise cause degradation of notch toughness. Electrodes should
be warmed before use to drive off any moisture to avoid hydrogen pick-up in
the weld. Preheating is not required, except for very heavy section thickness
welds or heavily constrained welds. Post-heating is not required but a
stress relief anneal, after welding of sections of 1-1/2" thick or
greater, is desirable. However the alloy may be used in the as-welded condition. From: http://www.suppliersonline.com/propertypages/HY80.asp#General
A good source of info. I am a welder and would suggest taking a class or two at
your local vo/tec school. Learning to weld right the first time on a
submarine project would be best. Also, you metioned welding on the farm. I would
suggest purchase of welder/generator of 8,000 to 10,000 watts "Miller,
Lincoln". Good power range and compact. Around $3,000.00 new or there
are used always around. Good thing about the welder/generator, it can be used for
emergency power! I hope this helps. V/R Norm Parmley ************************************************************************ |