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Guide to AWS A5.18: Carbon Steel Electrodes and Rods for Gas Shielded
Arc Welding
AWS
Classification
Chemical composition of solid wire or rod, wt % *
C Mn Si P S Cu
ER70S-2 <
0.07 0.90-1.40 0.40-0.70 <0.025 <0.035 <0.50
ER70S-3 0.06-0.15 0.90-1.40 0.45-0.70 <
0.025 <0.035 <0.50
ER70S-4 0.06-0.15 1.00-1.50 0.65-0.85 <
0.025 <0.035 <0.50
ER70S-6 0.06-0.15 1.40-1.85 0.80-1.15 <
0.025 <0.035 <0.50
ER70S-7 0.07-0.15 1.50-2.00 0.50-0.80 <
0.025 <0.035 <0.50
ER70S-G Not spec. Not spec. Not spec. Not spec. Not spec. <
0.50
* Single values shown in the table are maximum values.
Mechanical Properties of weld metal
AWS
Classification *
Tensile Strength
min. MPa
Yield Strength
min. MPa
(0.2% proof)
Elongation
min. %
Impact Energy
Charpy-V
J/°C
Shielding gas
ER70S-2 480 400 22 27 / –30 CO
2
or Ar / CO
2
ER70S-3 480 400 22 27 / –20 CO
2
or Ar / CO
2
ER70S-4 480 400 22 Not required CO
2
or Ar / CO
2
ER70S-6 480 400 22 27 / –30 CO
2
or Ar / CO
2
ER70S-7 480 400 22 27 / –30 CO
2
or Ar / CO
2
ER70S-G 480 400 22 As agreed CO
2
or Ar / CO
2
E70C-3X 480 400 22 27 / –20 CO
2
or 75-80%Ar / bal. CO
2
E70C-6X 480 400 22 27 / –30 CO
2
or 75-80%Ar / bal. CO
2
E70C-G(X ) 480 400 22 As agreed As agreed
E70C-GS(X) 480 Not spec
. Not spec. Not required As agreed
* The final X shown in the classification represents a ”C” or ”M” which corresponds to the shielding gas with which the electrode is classified.
The use of ”C” designates 100% CO
2
shielding, ”M” designates 75-80% Ar/balance CO
2
.
AWS
Classification **
Chemical composition of weld metal from metal cored wire, wt % *
C Mn Si P S Cu
E70C-3X 0.12 1.75 0.90 0.50
E70C-6X 0.12 1.75 0.90 0.03 0.50
E70C-G(X ) Not spec. Not spec. Not spec. Not spec. Not spec. Not spec.
E70C-GS(X) Not spec. Not spec. Not spec. Not spec. Not spec. Not spec.
* Single values shown in the table are maximum values.
** The final X shown in the classification represents a ”C” or ”M” which corresponds to the shielding gas with which the elec-
trode is classified. The use of ”C” designates 100% CO
2
shielding, ”M” designates 75-80% Ar/balance CO
2
.
0.03
0.03
0.03