Thoriated tungsten should not get in contact
with open cuts or wounds. The more
significant danger to welders can occur
when thorium oxide gets into the lungs. This
can happen from the exposure to vapours
during welding or from ingestion of
material/dust in the grinding of the tungsten.
Follow the manufacturer’s warnings,
instructions, and the Material Safety Data
Sheet (MSDS) for its use.
E3 (Color Code: Purple)
E3 tungsten electrodes (AWS classification
EWG) contain a minimum of 98% percent
tungsten and up to 1.5 percent
Lanthanum and small perc entages of
Zirconium and Yttrium they are called E3
Tungsten. E3 Tungsten Electrodes provide
conductivity simi lar to that of thoriated
electrodes. Typical ly, this means that E3
Tungsten Electrodes are exchangeable with
thoriated electrodes without requiring
significant welding process changes.
E3 deliver superior arc starting, electrode
lifetime, and overall cost-effectivenes.
When E3 Tungsten Electrodes are
compared with 2% thoriated tungsten, E3
requires fewer re-grinds and provides a
longer overall lifetime. Tests have shown
that ignition delay with E3 Tungsten
Electrodes actually improves over time,
while 2% thoriated tungsten starts to
deteriorate after only 25 starts. At
equivalent energy output, E3 Tungsten
Electrodes run cooler than 2% thoriated
tungsten, thereby extending overall tip
lifetime. E3 Tungsten Electrodes work well
on AC or DC. They can be used DC
electrode positive or negative with a
pointed end, or balled for use with AC
power sources.
36
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