Guide to AWS A5.18: Carbon Steel Electrodes and Rods for Gas Shielded
Arc We lding
AWS
Classification
Chemical composition of solid wire or rod, wt % *
Mn
Si
P
S
Cu
ER70S-2
C
<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.
AWS
Classification **
Chemical composition of weld metal from metal cored wire, wt % *
C
Mn
Si
E70C-3X
0.12
1.75
0.90
P
0.03
S
0.03
Cu
0.50
E70C-6X
0.12
1.75
0.90
0.03
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 electrode is classified. The use of ”C” designates 100% CO 2 shielding, ”M” designates 75-80% Ar/balance CO2.
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
CO2 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.
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