AWS A5.18 ER70S-3 Mig Welding Wire

| AWS A 5.18 ER70S-3 Mig Welding Wire Description

1）Classification and Application: AWS A5.18 ER70S-3 is a widely recognized solid carbon steel electrode designed primarily for Gas Metal Arc Welding (GMAW), commonly known as MIG welding. It is extensively used for single-pass and multi-pass welding of mild and low-alloy steels in various industrial and fabrication settings.

2）Key Chemical Composition: The "S-3" designation signifies its specific chemical composition, which typically includes lower levels of silicon and manganese compared to some other S-series wires. This composition provides a good balance of deoxidizing agents, suitable for welding on base metals with light rust or mill scale.

3）Mechanical Properties: This wire is engineered to produce welds with a minimum tensile strength of 70,000 psi (480 MPa), as indicated by the "70" in its classification. It also offers good yield strength and satisfactory ductility, making it suitable for general fabrication where moderate strength is required.

4）Arc Characteristics and Versatility: ER70S-3 is known for its stable arc, minimal spatter, and good bead appearance, which contributes to ease of use and clean welds. Its versatility allows it to be used in various welding positions and with different shielding gases, primarily CO2 or Argon/CO2 mixtures.

5）Shielding Gas Requirements: For optimal performance, ER70S-3 typically utilizes 100% CO2 or a blend of Argon and CO2 (e.g., 75% Argon / 25% CO2) as shielding gas. The choice of gas influences arc characteristics, penetration, and the amount of spatter.

6）Suitability for General Fabrication: Due to its balanced properties and ease of use, ER70S-3 is a popular choice for general fabrication work, structural steel erection, automotive repairs, and other applications where the base metal has a relatively clean surface and high strength requirements are not the absolute priority.

| AWS A5.18 ER70S-3 Mig Welding Wire Down Load

AWS A5.18 ER70S-3 Mig Welding Wire.pdf

| AWS A5.18 ER70S-3 Mig Welding Wire Data Sheet

| AWS A5.18 ER70S-3 Mig Welding Wire Workshop Show

| AWS A5.18 ER70S-3 Mig Welding Wire Production Video

| AWS A5.18 ER70S-3 Mig Welding Wire Application

| AWS A5.18 ER70S-3 Mig Welding Wire Certificate

| AWS A5.18 ER70S-3 Mig Welding Wire Comment & FAQ

What is AWS A5.18 ER70S-3 MIG welding wire?

AWS A5.18 ER70S-3 is a specific classification of solid **MIG welding wire**.
   It's designed for **gas metal arc welding** (GMAW) of carbon and certain low-alloy steels.
   This **welding consumable** is widely recognized for its good general-purpose welding characteristics and consistent performance.

What does the "ER70S-3" designation mean?

"ER" stands for electrode or rod, indicating it's a filler metal.
   "70" signifies a minimum tensile strength of 70,000 pounds per square inch (psi) in the as-welded condition, highlighting its strength.
   "S" denotes a solid wire, distinguishing it from flux-cored wires.
   "3" refers to the chemical composition and the specific deoxidizing elements within the wire, indicating a good level of deoxidizers suitable for welding on light rust or mill scale. This balance helps in achieving clean welds.

What are the primary applications of ER70S-3 welding wire?

ER70S-3 is commonly used for **general fabrication**, structural steel components, automotive parts, and pressure vessel manufacturing.
   It's highly suitable for both single-pass and multi-pass **welding applications**.
   This versatile wire performs exceptionally well across various industries requiring reliable **carbon steel welding**.

What types of shielding gas are recommended for ER70S-3?

For optimal results with ER70S-3, a mixture of 75% Argon (Ar) and 25% Carbon Dioxide (CO2) is most common, often referred to as C25 **shielding gas**.
   100% CO2 can also be used, especially for deeper penetration and in out-of-position welding, though it may result in increased spatter.
   Other argon-rich blends can be employed depending on specific application needs, desired arc characteristics, and improved bead appearance.

Can ER70S-3 be used for welding stainless steel?

No, ER70S-3 is specifically engineered for welding carbon and certain low-alloy steels.
   It is not suitable for welding **stainless steel**, as stainless steel requires different filler metals with specific metallurgical properties to match the base material's corrosion resistance and mechanical properties.

What are the typical mechanical properties of ER70S-3 welds?

ER70S-3 welds typically exhibit a minimum tensile strength of 70,000 psi (480 MPa) and a minimum yield strength of 58,000 psi (400 MPa).
   It also offers good ductility and impact toughness, making it a reliable choice for various structural and load-bearing applications.
   These **mechanical properties** ensure strong, durable, and resilient weldments.

What are the advantages of using ER70S-3 over other MIG wires?

ER70S-3 offers good bead appearance, consistent arc stability, and minimal spatter when used correctly, contributing to a clean finish.
   Its balanced deoxidizer content makes it forgiving on slightly contaminated surfaces, reducing the need for extensive pre-cleaning.
   It's a versatile and cost-effective **solid wire** solution for a wide range of **mild steel welding** tasks, making it a go-to for many fabricators.

What is the difference between ER70S-3 and ER70S-6?

The primary difference between **ER70S-3** and **ER70S-6** lies in their deoxidizer content.
   ER70S-6 contains higher levels of manganese and silicon, providing superior deoxidation and tolerance for mill scale, rust, and other surface contaminants, making it more robust for challenging conditions.
   ER70S-3 is best suited for clean, well-prepared base metals, while ER70S-6 is more forgiving on less-than-ideal surfaces, offering better "clean-up" action during welding.

When should I choose ER70S-3 over ER70S-6?

Choose ER70S-3 when working with clean, unpainted, or lightly prepped base materials where minimal contamination is present.
   If you consistently work with rusty, oily, or heavily scaled steel, ER70S-6 would be a more appropriate choice due to its enhanced cleaning action and ability to penetrate through impurities.

What wire diameters are available for ER70S-3?

ER70S-3 is commonly available in various **wire diameters**, including 0.023 inch (0.6 mm), 0.030 inch (0.8 mm), 0.035 inch (0.9 mm), and 0.045 inch (1.2 mm).
   Larger diameters like 1/16 inch (1.6 mm) are also available for heavy-duty, high-deposition applications.
   The appropriate **welding wire diameter** depends on the material thickness, joint design, and desired welding current.

How does wire feed speed affect welding with ER70S-3?

**Wire feed speed** directly influences the welding current and heat input during the **GMAW process**.
   Higher wire feed speed generally results in higher current, deeper penetration, and a narrower bead.
   Proper adjustment of wire feed speed, in conjunction with voltage, is crucial for achieving optimal bead profile, fusion, and avoiding common welding defects.

What are common welding parameters for ER70S-3?

**Welding parameters** such as voltage, wire feed speed, and amperage depend heavily on the wire diameter, material thickness, and joint configuration.
   Always refer to the **welding wire manufacturer's recommendations** or a reputable welding chart as a starting point.
   Trial and error with test pieces is often necessary to fine-tune parameters for specific applications and achieve the desired weld quality.

Does ER70S-3 require preheating?

For typical mild steel applications, preheating is generally not required for ER70S-3 due to its excellent weldability.
   However, for very thick sections (e.g., over 1 inch), highly restrained joints, or certain low-alloy steels, preheating may be recommended to prevent hydrogen-induced cracking and improve overall weld quality and mechanical properties.

What are the storage recommendations for ER70S-3 welding wire?

Store **ER70S-3 welding wire** in a dry, well-ventilated area to prevent moisture absorption, which can lead to porosity.
   Keep the wire in its original sealed packaging until ready for use to protect it from humidity, dust, and other contaminants.
   Proper storage ensures consistent weld performance, stable arc, and prevents issues like arc instability or porosity, preserving its quality.

Can ER70S-3 be used for out-of-position welding?

Yes, ER70S-3 can be effectively used for **out-of-position welding**, especially with appropriate parameters and techniques.
   For overhead and vertical-up positions, lower wire feed speeds and voltage are typically used to manage the weld puddle effectively and prevent sag.
   **Pulse MIG welding** with ER70S-3 can also significantly improve out-of-position capabilities and control.

What causes porosity when welding with ER70S-3?

Porosity in **ER70S-3 welds** can be caused by inadequate shielding gas coverage, moisture on the wire or base metal, excessive welding speed, or contaminants on the workpiece.
   Ensure proper gas flow rate, thoroughly clean the base metal, and check for drafts in the welding area to minimize porosity.
   Also, verify that your shielding gas cylinder is not running low or has leaks in the lines, as this impacts **weld integrity**.

Is ER70S-3 suitable for robotic welding?

Yes, ER70S-3 is highly suitable for **robotic welding** and automated welding processes due to its consistent feeding characteristics and stable arc.
   Its reliable performance and predictable results make it a popular choice for high-volume manufacturing environments where consistency is key.
   Automated systems greatly benefit from the uniformity and smooth operation of this **MIG wire**.

What is the shelf life of ER70S-3 welding wire?

When stored properly in its original sealed packaging in a dry environment, **ER70S-3 welding wire** typically has an indefinite shelf life.
   However, once opened, it's best to use it within a reasonable timeframe, especially in humid conditions, to prevent moisture absorption and potential welding issues.
   Always inspect the wire for signs of rust or degradation before use to ensure optimal **welding quality**.

Are there any safety precautions when using ER70S-3?

Standard **welding safety precautions** apply, including wearing appropriate personal protective equipment (PPE) such as welding helmets, gloves, and flame-retardant clothing.
   Ensure proper ventilation to avoid inhaling **welding fumes**, which can be hazardous.
   Always follow manufacturer guidelines and safety data sheets (SDS) for safe operation and handling of welding consumables.

Where can I find the AWS A5.18 specification for ER70S-3?

The full **AWS A5.18 specification**, which details the chemical and mechanical requirements for ER70S-3, can be purchased directly from the American Welding Society (AWS).
   This comprehensive specification is crucial for understanding the precise standards, **quality control**, and compliance requirements of the welding wire.
   It's an essential reference for engineers, quality assurance personnel, and anyone involved in **welding material verification**.

What are some common alternatives to ER70S-3?

Common alternatives include **ER70S-6**, which offers better deoxidation for less clean surfaces, and E71T-1 flux-cored wire for applications requiring higher deposition rates or welding on dirtier material.
   The choice of alternative depends on the specific welding environment, base material cleanliness, and desired weld properties, such as penetration or appearance.
   Always consider the **base metal** and application before selecting an alternative **welding consumable**.