5356 Aluminium TIG Welding Rods are a high-quality TIG wire for the purpose of TIG welding cast aluminium and specifically the 4000 to 6000 series. The major element in 5356 wire is 5% silicon. 5356 is a softer wire due to its silicon content which makes it ideal for welding castings as the melting point is lowered. The filler wire is supplied in 5kg Tubes.