By HgTX
Date 12-30-2008 20:01
Edited 12-30-2008 20:06
The 0.12 limit matches the limit given in AWS A5.23 Table 2 for those same electrodes. It applies to B1, Ni1, Ni2, Ni5, and W, and all those have a limit of 0.12% carbon in the weld metal in A5.23. The range given in A5.23 Table 1 for EM12K is for the electrode composition, not the weld metal composition.
That said, the chemistry test in A5.23 is based on a very different specimen from that in D1.5, so it may not be a valid question nor a reasonable requirement to have D1.5 test plate chemistry match A5.23 test chemistry. If the D1.5 specimen is more subject to base metal dilution (theoretically if you take your specimen from the same area the AWMT comes from it might not be), then you can't expect the same results. Plus, you could pick a particularly low-C batch for your PQR and then use any electrode that satisfied A5.23 in production, so I'm not sure what that gains them either. NYS always thinks they know best, though. (Yeah, Joe, you heard me.)
Hg