National
Electronic Alloys Summary of Products A
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WELDING
The Nickel/Iron
alloys can be successfully welded using most standard
arc welding processes. In general, preparation
for welding should be similar to stainless steels
and should include proper cleaning and handling.
Joint designs should allow easy access to the
weld because of poor weld pool fluidity. Designs
should also limit total weld volume to reduce
shrinkage problems. Pre-heating and post-heating
are not required and should be avoided. A low
interpass temperature (300 F max.) should e maintained.
Welding is most commonly performed using the gas
tungsten arc or gas metal arc process. Gas tungsten
arc welding can be accomplished with Ar and /or
He shielding gases. Welding is best performed
with a freshly ground thoriated tungsten electrode.
Gas metal arc welding can be successfully performed
in all metal transfer modes depending primarily
on base metal thickness. Shielding gases should
be Ar or Ar/He mixtures. Other non-arc welding
processes (ex. resistance) may also be used.
When a filler metal is needed, a matching composition
rod will provide the best match in thermal expansion
properties. If a matching composition is not available
a high nickel filler metal conforming to AWS A5.14
ERNi-1 or ERNiCRFe-5 can be used. These materials
will result in a weld with different thermal expansion
properties..
