UNIMIG 4043 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. 4043 is a softer wire due to its silicon content which makes it ideal for welding castings as the melting point is lowered. The silicon additives results in improved fluidity (wetting action) of the weld pool, and also produces a weld less sensitive to cracking. Its bright weld appearance makes it a popular choice of welders looking for a well presented weld finish. Unimig’s high purity fillers have sensational flow characteristics and produce exceptional welds that are free of cracks, fusion defects and other problems which inferior wires are prone to.