http://www.alcotec.com/atuaa.htm

1xxx Series Alloys - (non-heat treatable - with ultimate tensile
strength of 10 to 27 ksi) this series is often referred to as the pure
aluminum series because it is required to have 99.0% minimum aluminum.
They are weldable. However, because of their narrow melting range, they
require certain considerations in order to produce acceptable welding
procedures. When considered for fabrication, these alloys are selected
primarily for their superior corrosion resistance such as in
specialized chemical tanks and piping, or for their excellent
electrical conductivity as in      bus bar applications.       These
alloys have relatively poor mechanical properties and would seldom be
considered for general structural applications. These base alloys are
often welded with matching filler material or with 4xxx filler alloys
dependent on application and performance requirements.
bus bars???