Wirpo Katalogy

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 % *

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.

<0.50

* Single values shown in the table are maximum values.

AWS

Classification **

Chemical composition of weld metal from metal cored wire, wt % *

E70C-3X

0.12

1.75

0.90

0.03

0.50

E70C-6X

0.12

1.75

0.90

0.03

0.50

E70C-G(X)

Not spec.

E70C-GS(X)

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

27 / –30

CO 2 or Ar / CO 2

ER70S-3

480

400

27 / –20

CO 2 or Ar / CO 2

ER70S-4

480

400

Not required

CO 2 or Ar / CO 2

ER70S-6

480

400

27 / –30

CO 2 or Ar / CO 2

ER70S-7

480

400

27 / –30

CO 2 or Ar / CO 2

ER70S-G

480

400

As agreed

CO2 or Ar / CO 2

E70C-3X

480

400

27 / –20

CO 2 or 75-80%Ar / bal. CO 2

E70C-6X

480

400

27 / –30

CO 2 or 75-80%Ar / bal. CO 2

E70C-G(X)

480

400

As agreed

E70C-GS(X)

480

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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