Overview
ProStar ER4043 aluminum welding wire is a general-purpose silicon-aluminum (AlSi5) filler metal designed for MIG (GMAW) and TIG (GTAW) welding of aluminum alloys. This 1-pound spool in 1.2mm (3/64″) diameter provides consistent arc performance and produces welds with minimal spatter and superior surface finish. Manufactured to AWS A5.10/ASME SFA A5.10 standards, ProStar ER4043 is ideal for fabrication shops, maintenance operations, and custom aluminum welding applications.
Key Features
- Silicon content 4.5–6.0% creates improved weld pool fluidity and wetting action
- Less sensitive to weld cracking with bright weld finish
- Complies with AWS A5.10/ASME SFA A5.10 specification
- 4-inch spool wrapped in moisture-resistant plastic film
- Compatible with 1xxx, 3xxx, 6xxx, and low-Mg 5xxx aluminum alloys including 3003, 5052, 6061, and 6063
- All-position welding capability for versatile applications
Technical Specifications
- Wire Diameter: 1.2mm (0.045″ / 3/64″)
- Net Weight: 1 pound
- Spool Size: 4 inches
- Silicon: 4.5–6.0%, Iron: 0.8%, Copper: 0.3%, Manganese: 0.05%, Magnesium: 0.05%, Zinc: 0.1%, Titanium: 0.2%, Aluminum: balance
- Shielding Gas: Argon, Helium, or mixture
- AWS Classification: ER4043
- Process: MIG (GMAW) / TIG (GTAW)
- Packaging: Moisture-resistant plastic film
- Country of Origin: United States
Typical Applications
General-purpose, all-position aluminum welding wire used to weld various grades of aluminum with improved fluidity and resistance to cracking; bright weld finish makes it a popular choice for welders. ER4043 is commonly used in:
- Bicycles, trucks, trailers, and automotive parts and equipment
- Aerospace and aircraft repairs
- Marine and shipbuilding applications
- Repair welding of aluminum and magnesium alloy castings
- Pressure vessel fabrication
- Custom aluminum fabrication and prototype work
Compatibility & Replacements
Compatible With
- All standard MIG welding machines with aluminum feeders
- TIG torch applications (straight rod form)
- Aluminum alloys ASTM 3003, 3004, 5052, 6061, 6063
- Aluminum casting alloys 43, 355, 356, 214
- Argon, helium, or argon/helium gas shielding
Replaces / Drop-In Replacement For
ProStar ER4043 is a standard ER4043 grade wire and is interchangeable with equivalent ER4043 products from other manufacturers in the same 1.2mm diameter and 1-pound weight configuration. Verify compatibility with your specific equipment before ordering.
Works With
- MIG (GMAW—Gas Metal Arc Welding) equipment
- TIG (GTAW—Gas Tungsten Arc Welding) systems
- Semi-automatic and fully automatic wire feeders
- Portable MIG welding machines
- Industrial production welding lines
