Consumeables Catalog - Lincoln Electric

APPENDIX
AWS Classification System
The electrode classification identifies the chemical
composition of the electrode. The following paragraphs
highlight the differences between these electrodes and
electrode groups and indicate typical applications.
Mild Steel Electrodes
EL8, EL8K, EL12, EM11K, EM12, EM12K, EM13K,
EM14K, EM15K, EH10K, EH11K, EH12K and EH14 –
Carbon steel electrodes which vary from one another in
their carbon, manganese, and silicon contents. EM14K
electrodes also contain small additions of titanium,
although they are considered carbon steel electrodes.
Low Alloy Electrodes
EA1, EA2, EA3, EA3K, and EA4 (C-Mo Steel) –
Similar to the medium manganese and high
manganese carbon steel electrodes shown above
except that 0.5% molybdenum is added.
EB1, EB2, EB2H, EB3, EB5, EB6, EB6H, EB8, and
EB9 (Cr-Mo Steel) – Produce weld metal containing
between 0.5% and 10% chromium and between
0.5% and 1% molybdenum.
The letter “R” when added as a suffix to the EB2 or EB3
electrode classification or to the B2 or B3 weld metal
designation is an optional supplemental designator
indicating that the electrode will meet the reduced
residual limits necessary to meet “X” factor
requirements for step cooling applications.
Since all Cr-Mo weld deposits will air harden in still
air, both preheat and postweld heat treatment (PWHT)
are required for most applications.
EB9 is a 9% Cr-I % Mo electrode modified with
niobium (columbium) and vanadium designed to
provide improved creep strength, and oxidation
and corrosion resistance at elevated temperatures.
Submerged Arc (SAW) Flux & Electrode
Classification Descriptions for AWS A5.17 & A5.23
ENi1, ENi1K, ENi2, and ENi3 (Ni Steel) – Designed
to produce weld metal with increased strength
without being hardenable or with increased notch
toughness at temperatures as low as -100°F
(-73°C) or lower. They have been specified with
nickel contents which fall into three nominal levels
of 1 % Ni, 2.5% Ni, and 3.5% Ni.
ENi4, ENi5, EFl, EF2, and EF3 (Ni-Mo Steel) –
Contain between 0.5% and 2% nickel and between
0.25% and 0.5% molybdenum.
EF4, EF5, and EF6 (Cr-Ni-Mo Steel) - A
combination of Cr, Ni, and Mo develop the strength
levels and notch toughness required for a number
of high-strength, low-alloy or micro-alloyed
structural steels.
EM2, EM3, and EM4 (High-Strength, Low Alloy
Steel) – May contain a combination of Cr, Ni, Mo,
Ti, Zr and Al.
EW (Weathering Steel) – Designed to produce
weld metal that matches the corrosion resistance
and the coloring of the ASTM weathering-type
structural steels. These special properties are
achieved by the addition of about 0.5% copper to
the weld metal.
EG (General Low-Alloy Steel) – Indicates that the
electrode is of a general classification. It is general
because not all of the particular requirements
specified for each of the other classifications are
specified for this classification.
WELDING CONSUMABLES CATALOG ı 377