Oct 23, 2026
ER1070 vs ER1100 Aluminum Welding Wire: Which Should You Choose?
ER1070 or ER1100 aluminum welding wire? Compare aluminum purity, applications and base-metal compatibility to select the right filler.
What Is the Difference Between ER1070 and ER1100?
ER1070 and ER1100 are commercially pure aluminum filler metals used for suitable pure aluminum welding applications. The main difference is their aluminum content: ER1070 is typically Al99.7, while ER1100 is typically Al99.0.
Comparison | ER1070 | ER1100 |
|---|---|---|
Aluminum content | Typically 99.7% | Typically 99.0% |
Main consideration | High-purity aluminum matching | General commercial-purity aluminum matching |
Key requirement | Purity and conductivity specifications | Base-metal compatibility and application requirements |
Typical use | Selected high-purity aluminum components | General pure aluminum fabrication and compatible equipment |
When Should You Choose ER1070?
ER1070 is worth considering when high-purity aluminum is required, particularly for selected electrical components and applications where material purity and conductivity are important.
However, higher aluminum purity does not automatically mean higher mechanical strength or better performance in every application. Check the base-metal grade and service requirements before selecting the filler.
When Is ER1100 a Better Choice?
ER1100 is a practical option for compatible commercial-purity aluminum materials used in general fabrication, enclosures, ventilation ducts and containers.
The choice should depend on the base-metal specification and required properties, rather than aluminum content alone.
How Do You Select the Right Aluminum Filler Wire?
Before ordering ER1070 or ER1100, check:
- Base-metal grade: Confirm whether the material is 1070, 1060, 1050, 1100 or another alloy.
- Conductivity requirements: Check whether the application specifies an electrical conductivity target.
- Service conditions: Consider corrosion exposure and mechanical loading.
- Welding process: Confirm whether you need MIG/GMAW wire or TIG/GTAW filler rod.
- Technical specifications: Verify the AWS classification, chemical composition and welding procedure.
Neither wire is a universal substitute for 5xxx-series or 6xxx-series aluminum filler metals. For dissimilar alloys or load-bearing applications, confirm filler-metal compatibility before welding.
Conclusion
Choose ER1070 when high-purity aluminum matching is required, or consider ER1100 for compatible general pure aluminum applications. The right filler depends on the base metal, conductivity requirements and service conditions.
Contact GD WELD with your base-metal grade, welding process and wire diameter to discuss a suitable aluminum welding wire.
