ER4943 is high strength5.5% silicon aluminum filler with increased yield /shear strengths recommended for welding of 1XXX, 3XXX, 4XXX, 5XXX(less than 2.5% Mg), 6XXX,gradesand cast alloy such as 443, 355, 356 and 214.Used in many 4043 and 4643 applications yielding elite post weld heat treated requirements. Precise controlled chemistry gives operator appeal with improvement of feed-ability, less smut, stable arc and discoloration.