Kevin Trick

6XXX series is a common base material used in aluminum applications and, generally speaking, its best filler metal match is either the 4XXX or 5XXX series. The filler metal you choose depends on how the finished weld will be used. Will it be exposed to sustained elevated temperatures? Are strength, ductility, and toughness key requirements? Determine which properties are most important for the completed weld and select the filler metal according to those priorities.