Comparison of E71T-11 vs. E71T-GS: Key Differences in Flux-Cored Welding Wires

E71T-11 and E71T-GS are both flux-cored welding wires, but they differ in characteristics, applications, and performance. Here’s a breakdown of the two:

E71T-11

• Classification: AWS A5.20
• Shielding: Self-shielded (no external shielding gas required).
• Application:
  • Suitable for single-pass and limited multi-pass welding.
  • Commonly used for general-purpose welding, including thin to medium-gauge mild steel.
  • Ideal for outdoor work where wind may interfere with shielding gas.
• Position: Can be used in all positions (flat, horizontal, vertical, and overhead).
• Mechanical Properties:
  • Offers good tensile strength and impact resistance.
  • Designed for versatility and ease of use.
• Slag: Produces more slag than solid wires but is easy to remove.
• Penetration: Provides moderate to deep penetration.

E71T-GS

• Classification: Not AWS-standardized (the "GS" typically refers to "General Steel").
• Shielding: Self-shielded (no external shielding gas required).
• Application:
  • Designed for single-pass welding only.
  • Commonly used for thinner materials (less than 3/16" thick).
  • Primarily for home, hobby, and light-duty projects.
• Position: Best suited for flat and horizontal positions, though some wires can be used vertically.
• Mechanical Properties:
  • Lower tensile strength compared to E71T-11.
  • Less suited for structural applications or heavy-duty work.
• Slag: Produces less slag than E71T-11 but can still vary by brand.
• Penetration: Shallower penetration, making it better for thin materials.

Key Differences:

Which One Should You Use?

• Choose E71T-11 for versatility, heavier-duty work, or if you plan to weld thicker materials or in challenging positions.
• Opt for E71T-GS if you're working on lighter materials, such as sheet metal, or for DIY and hobby projects where structural integrity is less critical.

Conclusion and AWS Classification Explanations

E71T-GS is not under AWS classification because, strictly speaking, the "GS" designation does not correspond to a specific, recognized classification in the AWS A5.20 standard for flux-cored arc welding (FCAW) wires. Here’s why this distinction exists:

AWS Classification System:

• AWS (American Welding Society) provides a standardized system for welding consumables, including flux-cored wires, ensuring consistency in performance and properties.
• Wires like E71T-11 adhere to this system, with specific requirements for tensile strength, welding positions, shielding, and usability.

E71T-GS Explanation:

• "GS" typically stands for "General Steel" and is used by manufacturers as a non-standard designation for single-pass, self-shielded flux-cored wires.
• While some E71T-GS wires may meet AWS guidelines for similar wires (e.g., E71T-11), they are not officially certified or listed under an AWS classification.
• This lack of standardization means the mechanical properties, usability, and weldability can vary significantly between brands and products.

Why Does It Matter?

• E71T-11 ensures consistent performance and properties because it meets strict AWS criteria.
• E71T-GS, being non-standardized, can vary in quality and performance, depending on the manufacturer, making it more suited for light-duty or hobbyist applications.

If you need consistent and verifiable performance, especially for structural or critical applications, you should choose an AWS-classified wire like E71T-11. However, E71T-GS can still be a practical and cost-effective option for less demanding projects.