4043 vs 5356 Aluminum Filler: Which to Use for Welding?
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FAQ: 4043 vs 5356 Aluminum Filler
What are the main differences between 4043 and 5356 aluminum filler?
4043 has higher silicon content (5%) which improves fluidity and crack resistance, while 5356 contains magnesium (5%) for higher strength and better color matching after anodizing.
When should I use 4043 aluminum filler wire?
Use 4043 for welding 3003, 3004, 5052, 6061, and 6063 aluminum alloys, especially when working with thin materials or needing superior crack resistance.
What are the advantages of 5356 aluminum filler?
5356 provides higher tensile strength (up to 38,000 psi vs 30,000 psi for 4043), better ductility, and maintains its color better when anodized, making it ideal for structural applications.