AWS A5.18 ER70S-6 is standard MIG welding of carbon steel. E, R refers to electrode or rod. E, R is the meaning of the wire. Can only be represented by E.
ER70S-6 welding wire is commonly used for welding mild and carbon steel, especially where high-quality welds with smooth bead appearance are required. It's widely applied in automotive, construction, shipbuilding, and machinery fabrication. Its high silicon and manganese content improves deoxidation, making it ideal for welding on slightly rusty or dirty steel.
70 refers to the use of the post-deposited metal welded wire minimum tensile strength of 70 ksi (480 MPa).
In addition to high tensile strength (≥480 MPa), ER70S-6 also provides excellent feedability, arc stability, and low spatter generation, especially when used with CO₂ or Argon/CO₂ gas mixtures. These properties make it a go-to wire for MIG welding in industrial settings.
S is a solid acronym, meaning solid core wire. In addition to S, the standard may use C (composite), which indicates that the wire is for a metal core. The “6” denotes the wire’s chemical composition, defined by specific reference standards.
AWS A5.28 ER100S-G is a gas-welding low alloy steel standard.
ER100S-G welding wire is primarily used for welding high-strength low alloy (HSLA) steels. It’s commonly found in pressure vessels, cranes, bridges, and heavy equipment manufacturing—where higher mechanical performance is required. With a tensile strength of 100 ksi (690 MPa), it’s suitable for dynamic or fatigue-critical components.
E, R as defined above. 100 meaning as above. Represents the minimum tensile strength of 100 ksi (690 MPa). S means solid wire. G stands for the general classification of the chemical composition.
