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COATED ELECTRODES

Guide to AWS A5.1-1991

Covered electrode

for manual metalarc welding

Designates that the electrode meets the requirements of the hydogen test (optional for basic electrodes, asreceived or redried, with an average value not exceeding “z” ml. of H2/100 g deposited metal, where “z” is 4.8 or 16).

Designates an electrode (E7018M) for military require­ ments. Greater tough­ness, low moisture level and pick-up, and mandatory hydrogen limits for weld metal.

Designates that the electrode meets the requirements of the moisture pick-up test (optional for all basic electrodes except E 7018 M, for which the test is mandatory.

E E

70 70

18 16

M –1

HZ

R

Designates welding position, coating type and current type.

Designated min. tensile strength in ksi.

(1 ksi = 1000 psi ~ 6.9 MPa).

Designates that the

electrode (E 7016, E 7018, E 7024) meets the require­ ments for improved tough­ ness and ducility (E 7024).

3.01 AWS Classification

Tensile Yield strength min.

Impact

Elongation

Welding Type of coating Strength min.

Energy min % Position

Charp-V J/°C ksi MPa ksi MPa

AC

DC

E 6010 E 6011 E 6012 E 6013 E 6019 E 6020 E 6022 E 6027 E 7014 E 7015 E 7016 E 7016-1 E 7018 E 7018-1 E 7018M E 7024 E 7027 E 7028 E 7048

60 60 60 60 60 60 60 60 70 70 70 70 70 70 a) 70 70 70 70

– x x x x x x x x – x x x x – x x x x

+ pol + pol – pol + / – pol + / – pol c) + / – pol – pol c) + / – pol + / – pol + pol + pol + pol + pol + pol + pol + / – pol c) + / – pol + pol + pol

414 414 414 414 414 414 414 414 482 482 482 482 482 482 482 482 482 482 482

48 331 22 48 331 22 48 331 17 48 331 17 48 331 22 48 331

22

Not spec. Not spec. Not spec. 48 331 22 58 399 17 58 399 22 58 399 22 58 399 22 58 399 22 58 399 22 b) b) 24 58 399 17 58 399 22 58 399 22 58 399 22

27 / –29 27 / –29 Not spec.

Not spec.

27 / –18 Not spec.

Not spec.

27 / –29 Not spec.

27 / –29 27 / –29 27 / –46 27 / –29 27 / –46 67 / –29 Not spec.

27 / –29 27 / –29

27 / –29

a) Nominal value 70 ksi (482 MPa). b) Limits are 53–72 ksi (365–496 MPa). For ∅ 2.4 mm the limit is max. 77 ksi (ksi (531 MPa). c) H–V fillets: – pol. In addition there are requirements on: • Chemical composition of the weld metal • Radiographic test.

146

10 11 12 13 19 20 22 27 14 15 16 16 18 18 18 24 27 28 48

Code 1 2 4

Cellulosic Cellulosic Rutile Rutile Rutile/Acid Acid Acid Acid, high reco.

Rutile, iron pow.

Basic Basic Basic Basic, iron pow.

Basic, iron pow.

Basic, iron pow.

Rutile, high reco.

Acid, high reco.

Basic, high reco.

Basic, iron pow.

Type of Current

Welding position

All positions except vertical-down Flat and H-V fillets. All positions but in the vertical, V-down only.