ER70S-7

ER70S-7 is a general purpose MIG wire
suitable for many carbon steel welding
applications but with substantially greater
manganese content than ER70S-3 welding
alloy. The higher manganese provides slightly
better wetting and weld appearance with
slightly higher tensile and yield strengths
as well. These combined properties permit
increased speed when compared to S-3
product. Under equivalent welding conditions,
ER70S-7 produces as weld hardness lower
than ER70S-6 but higher than ER70S-3.

Typical Applications
• High tensile strength steels for automobiles
• Rolling stock
• Electrical appliances
• Machinery
• Air conditioners
• Light gauge steels
• Pipes
• Steel frames

AWS Specification
AWS A5.18/A5.18M:2005
AWS Classification ER70S-7

Welding Current for MIG process
DCEP (Electrode Positive, Reverse Polarity)

Typical Wire Chemistry with
Argon + 2% Oxygen
C 0.07 - 0.15
Mn 1.50 - 2.00
Si 0.50 - 0.80
P 0.025
S 0.035
Ni 0.15
Cr 0.15
Mo 0.15
V 0.03
Cu 0.50

Typical Wire Chemistry with
Argon + 20% CO2 shielding gas
C 0.09
Si 0.75
Mn 1.67
P 0.015
S 0.01

Typical Mechanical Properties
(As Welded) with Argon + 2%
Oxygen shielding gas
Yield Strength, ksi 68
Tensile Strength, ksi 82
Elongation%, min 27

Typical Mechanical Properties
(As Welded) with Argon + 20%
CO2 shielding gas
Yield Strength, ksi 70
Tensile Strength, ksi 82
Elongation%, min 29

Welding Positions

F,V,OH,H

Available Diameters MIG and
suggested Operating Range in Amps
.023" 35 - 70
.030" 50 - 100
.035" 100 - 150
.045" 150 - 200
1/16" 250 - 500

Available Diameters TIG
.035", .045", 1/16", 3/32", 1/8" & 5/32"