ER4043 MIG Aluminum Welding Wire 0.035 Inch, 1 Lb Spool, AlSi5 Alloy For General Purpose Welds, Low Cracking Susceptibility, No Fuss Flow For Easy Wetting And Strong, Reliable Joints

AlSi5 ER4043 Aluminum MIG Wire for General Welds 0.035 in
✔️ 1 lb spool, 0.035 in (0.89 mm) dia, AlSi5, 1, 2, 4 and 6 pack options

ER4043 aluminum MIG welding wire, commonly called AlSi5, is a popular general-purpose filler for aluminum welding. It’s known for good puddle flow, lower crack tendency, and bright, smooth welds when welding alloys such as 6061, 6063, 5052, 3004, and 3003, plus many cast alloys.

✅ 1 lb spool; available diameters 0.030" (0.76 mm), 0.035" (0.89 mm), 0.045" (1.14 mm)
✅ AlSi5 (~5% Si) reduces cracking and improves puddle flow
✅ Melting range 1065-1170 °F; density 0.097 lb/in³; bright welds
✅ Compatible with grades 6061, 6063, 5052, 3004, 3003 and cast alloys 356, 357, 413, 443
✅ Spool quantities: 1, 2, 4 and 6-pack (1 lb per spool)

💡 What is ER4043 aluminum MIG welding wire best used for in general fabrication?

This handy filler is a common choice for a wide range of aluminum welds and projects. - Handy for welding 6061, 6063, 5052, 3004, 3003
- Good for cast alloys like 356, 357, 413, 443
- AlSi5 chemistry lowers cracking risk and helps wetting
- Produces bright, strong joints with reliable flow