ER70S2 vs ER70S6 – Deep Analysis and Comparison

Choosing the right welding wire is crucial for achieving high-quality welds as a welder. ER70S2 and ER70S6 are two popular welding wires that are widely used in the industry. While both wires are made of mild steel, they differ in composition, performance, and application.

This article will explore the differences between ER70S2 and ER70S6 welding wires and help you choose the right one for your welding needs.

What are ER70S2 and ER70S6 Welding Wires?

ER70S2 and ER70S6 are both solid welding wires used for welding mild steel. They are classified as AWS A5.18 carbon steel electrodes and have a similar chemical composition, with high levels of manganese and silicon. However, they differ in the number of deoxidizers and other alloying elements present in the wire.

ER70S2 Vs. ER70S6

Feature ER70S2 Welding Wire ER70S6 Welding Wire
Deoxidizers Higher levels Lower levels
Alloying Elements More manganese and silicon Copper, nickel, and chromium
Impact Resistance Lower Higher
Tensile Strength Lower Higher
Distortion Less More
Application General welding, thin materials Heavy-duty applications, thicker materials

Chemical Composition

ER70S2 welding wire contains higher levels of deoxidizers and is alloyed with more manganese and silicon. This makes it a better choice for welding dirty or rusty metals, as the deoxidizers help to remove impurities and prevent porosity. It also produces a smoother, more stable arc, making it easier to control and less prone to spatter.

ER70S6 welding wire, on the other hand, contains fewer deoxidizers and more alloying elements like copper, nickel, and chromium. This results in higher tensile strength and better impact resistance, making it a better choice for heavy-duty applications and structures that are subject to vibration or shock.


ER70S2 welding wire is known for its excellent weldability and low spatter. It produces a softer, smoother weld with good penetration, making it a good choice for thin materials and sheet metal. It is also easier to use in all positions, making it a good choice for beginners and less experienced welders.

ER70S6 welding wire, on the other hand, produces a stronger, more durable weld with better impact resistance. It is less prone to cracking and produces less distortion, making it a good choice for welding thicker materials and structural applications.


ER70S2 welding wire is commonly used for general welding applications, such as automotive repairs, farm equipment, and structural fabrication. It is also a good choice for welding sheet metal, pipe, and tubing.

ER70S6 welding wire is often used in heavy-duty applications, such as construction, bridge building, and shipbuilding. It is also a good choice for welding high-strength steel and thicker materials.

Which One to Use?

Choosing between ER70S2 and ER70S6 welding wire depends on the application and the materials being welded. If you are welding thin materials or sheet metal or are a beginner welder, the ER70S2 welding wire is a good choice. It produces a smooth, easy-to-control arc and is less prone to spatter.

If you are welding heavy-duty materials or structures that are subject to vibration or shock, or if you need a stronger, more durable weld, the ER70S6 welding wire is a better choice. It produces a stronger, more impact-resistant weld with better tensile strength and less distortion, making it ideal for structural applications.

It’s also essential to note that ER70S2 and ER70S6 welding wires have different AWS classifications, determining the type of welding applications they suit. ER70S2 is classified as a GMAW (Gas Metal Arc Welding) wire, while ER70S6 is classified as a GTAW (Gas Tungsten Arc Welding) wire. Hence, choosing the appropriate wire for the type of welding you’re doing is crucial.


Choosing between ER70S2 and ER70S6 welding wires depends on the welding application and the type of material being welded. ER70S2 welding wire is ideal for general welding and thin materials, while ER70S6 welding wire is suitable for heavy-duty applications and thicker materials that require higher strength and impact resistance. It’s also essential to consider the AWS classification of each wire and choose the appropriate wire for the type of welding you’re doing.

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Dave Walker is a skilled welder and passionate blogger. With years of experience in welding, he has honed his craft and developed a deep understanding of the trade. In his blog, he shares his experiences, insights, and tips on welding, offering a valuable resource for fellow welders and those interested in the field. He is dedicated to promoting the importance of welding and its applications in various industries.