looks to me like it's qualified for AWS section A5.20 and the E71T-1M/T-9M is the type of filler metal...maybe that wire is the same as E71T-1M and E71T-9M.

Hi dtrudel

It means the following:

AWS = American Welding Society
A5.20 = The specification for carbon steel electrodes for FCAW
E = Electrode
71 = 70 ksi tensile strength and all position weldability
T = Tubular electrode
-1 = Usability designator
M = Classified with 75-80% argon, balance CO2.
-9 = Essentially the same as -1, but with improved impact properties.

In short, it does mean that they are duel certified:

AWS A5.20 E71T-1M AND AWS A5.20 E71T-9M

In this combination it does however mean only a very small difference in the specification requirement. -1 has an impact requirement of 20 ft lbf at 0°F, while -9 has an impact requirement of 20 ft lbf at -20°F

Hope this answers your question.

Regards
Niekie Jooste
Fabristruct Solutions