er70s 6 welding wire specification

Decoding ER70S-6 Welding Wire: Specifications and Uses

1. Understanding ER70S-6 Welding Wire

ER70S-6 is a type of solid carbon-steel welding wire commonly used in various welding applications. It is classified under the American Welding Society (AWS) A5.18 specification.

2. Chemical Composition

ER70S-6 welding wire has a specific chemical composition to ensure optimal welding performance and mechanical properties. The typical composition includes:

– Carbon (C): 0.06-0.15%
– Manganese (Mn): 1.40-1.85%
– Silicon (Si): 0.80-1.15%
– Phosphorus (P): ≤0.025%
– Sulfur (S): ≤0.035%
– Copper (Cu): ≤0.50%

The precise composition may vary slightly depending on the manufacturer and specific product.

3. Mechanical Properties

ER70S-6 welding wire is designed to produce welds with excellent mechanical properties. Some typical mechanical properties include:

– Tensile Strength: 70,000-85,000 psi
– Yield Strength: 58,000-70,000 psi
– Elongation: 22-30%
– Impact Toughness: ≥27 J (20 ft-lbf) at room temperature

These properties ensure strong and durable welds, making ER70S-6 suitable for a wide range of welding applications.

4. Welding Processes

ER70S-6 welding wire is primarily used for gas metal arc welding (GMAW) or metal inert gas (MIG) welding. It can be used with both carbon steels and low-alloy steels.

5. Shielding Gas

When using ER70S-6 welding wire, a suitable shielding gas is required to protect the weld pool from atmospheric contamination. Commonly used shielding gases include carbon dioxide (CO2), argon (Ar), or a combination of CO2 and Ar (also known as a mixed gas).

The choice of shielding gas depends on the specific application, material thickness, and desired weld characteristics.

6. Applications

ER70S-6 welding wire is versatile and widely used in various industries and applications, including:

– Automotive manufacturing and repair
– Structural steel fabrication
– Shipbuilding
– Construction
– General fabrication
– Machinery and equipment manufacturing
– Pipe welding
– Maintenance and repair work

The wire’s consistent performance, ease of use, and reliable mechanical properties make it a popular choice for these applications.

7. Storage and Handling

To maintain the quality and performance of ER70S-6 welding wire, proper storage and handling practices are essential. The wire should be stored in a dry environment, protected from moisture, dust, and contaminants. It is recommended to use wire feeders or dispensers designed for welding wire to ensure smooth and consistent feeding during welding operations.


ER70S-6 welding wire is a reliable and widely used carbon-steel welding wire. Understanding its specifications, chemical composition, mechanical properties, and suitable applications is crucial for achieving high-quality welds. By following proper storage and handling practices and using the appropriate shielding gas, welders can maximize the performance and efficiency of ER70S-6 welding wire in their welding processes.

Leave a Reply