What You Need to Know About ER70S-6 Welding Wire


ER70S-6 is a copper coated solid welding wire which may be produced either in the form of welding rods to be suited for GTAW welding or in the form of welding coils to be suited for GMAW welding. This type of welding wires is used in welding mild steel whether with argon gas shielding or carbon dioxide gas shielding or with a mixture of both in addition to other gases which can be mixed with any of the previously mentioned shielding gases like helium and oxygen to be used for certain applications.

What Does ER70S-6 Stand for?

er70s-6 meaning
er70s-6 meaning

ER70S-6 welding wire is the mild steel welding wire designation as per the American welding society standard specification AWS SFA 5.18 “Specification for Carbon Steel Electrodes and Rods for Gas Shielded Arc Welding”. Each part in the welding wire designation stands for certain information as follows:

  • ER: stands for welding electrode in the form of rod.
  • 70: stands for the minimum ultimate tensile strength of 70,000 psi for the produced weld metal.
  • S: stands for the solid welding wire form. This letter may be C in other designations which stands for composite welding wire form.
  • 6: stands for the chemical designator which refers to the amount of deoxidizers added to the wire including silicon, manganese, aluminum, zirconium and titanium that is why this digit in the welding wire designation may take other numbers: 2,3,4,7,8 or G.
  • 2: stands for the chemical designator which refers to that the welding wire contains deoxidizers other than manganese and silicon including titanium, zirconium and aluminum as shown on the table below.
  • 3,4,6&7: refers to the amounts of Mn & Si deoxidizers added to the welding wire with little differences between them in the added amount as shown in table below.
  • 8: stands for the addition of titanium and zirconium to the welding wires as deoxidizers but with limited amounts as Zr%+Ti% shall be in the range 0.1% to 0.3%.
er70s specification
er70s specification

What are the ER70S-6 common sizes?

ER70S-6 welding wires are produced in a wide range of sizes including and not limited to the following:

Dimension (mm)Current (A)WηHFeedU
  • W: gas consumption (l/min).
  • η: recovery, g weld metal / 100g wire (%).
  • H: deposition rate (Kg weld metal/arc time).
  • Feed: feeding rate (m/min).
  • U: arc voltage (V).

What is ER70S-6 welding wire used for?

ER70S-6 welding wire is used in single pass and multiple pass welding. They are suited for sheet metal applications, where smooth weld beads are desired, and structural and plate steels that have moderate amounts of rust or mill scale. These welding wires permit the use of higher current ranges with either CO2 shielding gas or with mixtures of argon and oxygen or argon and carbon dioxide. Typical specifications for these steels are ASTM A36, A285-C, A515-70, and A516-70, which have UNS numbers K02600, K02801, K03101, and K02700, respectively.

This type of welding wires is used in many applications:

  • General construction projects in piping work welding specially for the single side welds where it is used for the root pass by using TIG welding.
  • Pressure vessels fabrication.
  • Ship building welding.

What is the difference between ER70S-2 and ER70S-6?

As mentioned in the explanation of welding wire designation, the number 2 in the ER70S-2 welding wire designation refers to the addition of Ti, Zr and Al as deoxidizers which are not present in the ER70S-6 welding wire that is why the ER70S-2 welding wire is called triple deoxidized copper coated wire. The high content of deoxidizers makes this wire suitable for welding high rusty and dirty surfaces without sacrificing weld quality. The typical materials using this wire are similar to that of ER70S-6. This wire is also usually used for single-pass for welding from one side like welding the root pass in pipe welding without a protective root shielding gas on the backside of the joint and may also be used for multiple pass welding.

ER70S-6 Welding Wire Manufacturer & Supplier

ATLANTIC CHINA WELDING CONSUMABLES, INC. has specialized in manufacturing welding consumables for more than 70 years. In terms of global scale and diversity, ATLANTIC operates manufacturing plants in China, and Vietnam along with branches located in the UAE, Egypt, Saudi Arabia, Nigeria, and Turkey. With a professional team and advanced equipment, ATLANTIC is one of the top er70s-6 welding wire manufacturers and suppliers in the world, feel free to contact us to get the best er70s-6 welding wires quotation.

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