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I must ask what are you building? Or better, why is the use of GMAW and ER70S-6 required? SMAW and SAW processes both offer -50 electrodes verified by the manufacture. You could weld up a coupon and have it tested at -50 but that is one test, Lincoln and the others do not rate their prodcuts...

ASME is no longer using the S symbol for API materials.

As an Owner/User you can follow API 510 and repair the vessel without the use of a NB-23 shop and inspector. You will not be able to add the "R" stamp unless you use a National Board location and AI.

1 1/4" is the thickness requireing PWHT within ASME B31.8 Gathering systems, this is the same as ASME B31.4

API 570 Section 7.1.2 Newly Installed Piping Systems or Changes in Service, lists 3 methods. a) A corrosion rate for a piping circuit may be calculated from data collected by the owner/user on piping systems of simular material and service. b) If data for the same or simular service are not...