ER4043 Aluminum MIG Welding Wire – 6000 Series Filler
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Overview
Nexalloy ER4043 Aluminum MIG Welding Wire – 6000 Series Filler
Nexalloy ER4043 Aluminum MIG Welding Wire is known for its versatility and forgiving nature, making it excellent for welding 6000 series aluminum alloys. Silicon additions improve fluidity and produce smooth, clean welds with minimal spatter, and the alloy is less prone to cracking than many alternatives.
Key Features
- Versatile and forgiving — reliable for professionals and hobbyists
- Excellent for 6000 series aluminum alloys
- Silicon additions improve fluidity and reduce spatter
- Smooth, aesthetically pleasing welds less prone to cracking
- Available in multiple diameters and spool weights
Technical Specifications
| AWS Classification | ER4043 |
| Welding Process | MIG (GMAW) |
| Base Alloys | 6000 series aluminum |
| Silicon Content | 5% |
| Available Diameters | .030", .035", .045", 3/64", 1/16" |
| Available Spool Weights | 1 lb, 5 lb, 16 lb, 20 lb |
Part Number & Size Reference
Other Products
ER5356 MIG Wire | ER5554 MIG Wire | ER4043 TIG Rods | ER5356 TIG Rods | E4043 Stick Electrodes
Specifications
| Brand | Nexalloy |
|---|---|
| Product type | Aluminum Welding |
| Size | .030 inch (0.8mm) 1lbs., .035 inch (0.9mm) 1lbs., .045 inch (1.2mm) 1lbs., .030 inch (0.8mm) 5lbs., .035 inch (0.9mm) 5lbs., .045 inch (1.2mm) 5lbs., .035 inch (0.9mm) 16lbs., .045 inch (1.2mm) 20lbs., 1/16 inch (1.6mm) 20lbs. |
Sizes & pricing
Every option with its part number and price. Select one to load it into the cart above.
| Option | SKU | Price | Select |
|---|---|---|---|
| .030 inch (0.8mm) 1lbs. | MW404303001 | $16.99 | |
| .035 inch (0.9mm) 1lbs. | MW404303501 | $15.99 | |
| .045 inch (1.2mm) 1lbs. | MW404304501 | $14.99 | |
| .030 inch (0.8mm) 5lbs. | MW404303005 | $87.00 | |
| .035 inch (0.9mm) 5lbs. | MW404303505 | $88.00 | |
| .045 inch (1.2mm) 5lbs. | MW404304505 | $89.00 | |
| .035 inch (0.9mm) 16lbs. | MW404303516 | $209.00 | |
| .045 inch (1.2mm) 20lbs. | MW404336420 | $239.00 | |
| 1/16 inch (1.6mm) 20lbs. | MW404311620 | $249.00 |
Frequently asked questions
What is 4043 aluminum MIG wire used for?
ER4043 is a silicon-alloyed MIG wire built for welding 6000 series aluminum. The 5% silicon addition makes the puddle flow more easily, which is why it's often the default recommendation for general aluminum fabrication.
What aluminum alloys pair with 4043 wire?
It's formulated for 6xxx series base metals — alloys like 6061 and 6063 that are common in extrusions, frames, and structural aluminum.
Why does 4043 wire contain silicon?
The silicon lowers the melting point and improves fluidity of the weld puddle, giving you a smoother-looking bead with less spatter and a lower chance of cracking than some alternative fillers.
What wire diameters are offered for 4043?
You can get it in .030", .035", .045", 3/64", or 1/16", matching the sizing most MIG guns and spool guns are set up for.
What spool sizes does 4043 wire come in?
It's stocked in 1 lb, 5 lb, 16 lb, and 20 lb spools, so you're not stuck buying a bulk spool for a one-off repair or constantly rebuying small ones for a bigger job.
Is 4043 a forgiving wire for someone newer to aluminum welding?
Generally, yes. Its smoother-flowing puddle and lower spatter make it more forgiving to run than some other aluminum fillers, which is part of why it's a common recommendation for less experienced welders.
Does 4043 wire resist cracking better than other aluminum fillers?
Its silicon content does make it less crack-sensitive than straight aluminum or some magnesium-alloyed fillers, which is one reason it's the standard choice for general-purpose 6xxx welding.
Can 4043 wire be used on aluminum extrusions and frames?
Yes — 6xxx series alloys, which cover most common aluminum extrusions and structural framing, are exactly what 4043 is designed to match.
Should I use 4043 or 5356 wire on 6061 aluminum?
For 6061 and other 6xxx alloys, 4043 is the standard match. 5356 is intended for 5xxx (magnesium) base metals, so using it on 6061 wouldn't give you the same fluidity or crack resistance that 4043's silicon content provides.
How does 4043 wire affect the finished weld's appearance?
The improved fluidity from the silicon addition tends to produce a flatter, smoother bead profile with less spatter clean-up needed, which is part of why it's popular for visible or cosmetic aluminum welds.
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