By SWN1158
Date 12-02-2019 11:43
Edited 12-02-2019 18:57
Brent,
Respectfully, I'm fully aware that it's based on the thickness thickness and material grade, but the welding processes are included in Table 3.3 for a reason. If for no other reason, the “process” with SMAW electrodes “other than low hydrogen” and the “process” with SMAW “low hydrogen” electrodes require different minimum preheat temperatures. Technically speaking, its the same process, but the preheat and interpass temperatures are a little different within the four categories; in particular, when the material thickness exceeds 2 1/2". The original post mentioned A572 Grades 50 (Category B) and 65 (Category C) which both require a low hydrogen electrode, but the original post failed to mention the material thickness, which is part of the equation. The other part of the equation is the process, which was also not mentioned. While not a consideration for this particular application, its still, at some point in time, a consideration, simply because it is not a given that the SMAW “process” requires the same amount of preheat for a given thickness. In my humble opinion, I simply thought it was worthy of mention for future reference. Maybe my original response warranted more of an explanation.