3
All-State®
No. 18* Electrode
for Nickel-Chromium-Iron Alloys DC
Reverse Polarity (Electrode + ) All Position General
Characteristics Resists
oxidation at high temperatures and impacts at cryogenic temperatures while maintaining
excellent tensile strength.
Provides excellent arc stability with minimum of spatter.
Typical Applications
Recommended for welding nickel-chromium-iron
alloys (such as Inconel* 600, 601 and 690) and joining them to
dissimilar metals. Also used for welding
9% nickel steels used in cryogenic applications. Carbon and stainless
steels are often joined to high nickel
base metals with this electrode. Qualities
Tensile strength—up to 97,000
psi (68.21 kgs/mm2) Yield
strength—up to 62,000 psi (43.60 kgs/mm2)
Elongation in 2"—42 to 45%
Hardness—150 to 175 BrineIl
AWS A5.11, Class ENiCrFe-3
Procedures Base
metal must be clean. Nickel and nickel alloys get brittle when welded if sulphur
or lead is absorbed into the weld
deposit; these impurities are found in lubricants, dirts, grease, oil, paint,
etc. Preheating is not recommended unless
the metal is subject to temperatures below 32°F (0°C). A short arc must
be maintained. Stringer beads or weave
beads not more than three times the diameter of the electrode will minimize heat
input. Remove all slag and
clean thoroughly after each pass.
