4043 aluminium alloy is a wrought aluminium alloy with good corrosion resistance typically used as filler material for welding of aluminium parts. It contains high amounts of silicon (between 4.5 and 6%) and trace amounts of other metals. It is grey in appearance and is sold as either welding wire or welding rod for TIG/MIG processes.
Chemical composition Aluminium is the remainder. ElementPercentage (%)Silicon (Si)4.5-6.0Iron (Fe)0.80Copper (Cu)0.30Manganese (Mn)0.05Magnesium (Mg)0.05Zinc (Zn)0.10Titanium (Ti)0.20Beryllium (Be)0.0003
References
Aluminium alloy table