Eagle ER4943 Aluminum Filler Wire | High-Strength Aluminum Welding Wire

Eagle ER4943 is recommended for:

6061 aluminum
6063 aluminum
Other 6XXX-series aluminum alloys
Automotive structural components
Aerospace assemblies
Heat exchangers
Bicycle frames
Performance equipment
Structural aluminum fabrication
General aluminum repair
MIG welding
TIG welding

Designed for applications where higher joint strength is required than with ER4043 while maintaining good fluidity and crack resistance.

Clean the weld area thoroughly before welding.

Remove oil, grease, lubricants, coatings, dirt and aluminum oxide from the surface.

Use a dedicated stainless steel wire brush for oxide removal and keep it reserved for aluminum only.

For MIG applications, use 100% Argon shielding gas and DC Reverse [+] / DCEP polarity.

For TIG applications, use 100% Argon shielding gas and AC current.

Adjust amperage, voltage, travel speed and gas flow according to material thickness, joint design and process.

Eagle ER4943 is an aluminum-silicon filler alloy with magnesium additions that improve its mechanical properties and heat-treatment response.

Compared with ER4043, ER4943 is designed to provide higher tensile strength after aging while retaining similar weldability, good fluidity and reduced hot-cracking tendency.

Why Eagle ER4943?

Higher post-weld strength — designed to outperform ER4043 in heat-treated aluminum applications.
Excellent for 6XXX-series aluminum — especially 6061 and 6063.

Good fluidity — smooth puddle behavior and easy weldability.
Reduced hot cracking — suitable for demanding structural aluminum applications.

Heat-treatment responsive — maintains weld integrity in T5 and T6 conditions.

ER4943 or ER4043?

Choose ER4943 when higher post-weld strength and heat-treated performance are important.

Choose ER4043 when you want a more traditional general-purpose aluminum-silicon filler with excellent flow and widespread compatibility.

In simple terms:
ER4943 = higher-strength upgrade for 6XXX aluminum
ER4043 = general-purpose aluminum-silicon filler

MIG / GMAW
Shielding Gas: 100% Argon
Polarity: DC Reverse [+] / DCEP
TIG / GTAW
Shielding Gas: 100% Argon
Current: AC