Is this a military project? That spec could possibly be related to a project peculiar document. In any case it is not related to D17.1 as far as I know
It's probably a proprietary specification, owned by the design company or OEM. If it's off a drawing, you can always try to contact the company who owns it. Lockheed, Boeing, they both have their own welding specs. Good luck.
Can't find that exact spec but I have several very close to those numbers and they are all ATK spec's. Hope this helps
Uh is that the one for welding barbed wire to a ceder post , crack of dawn or a broker heart? There are so many.
Oops here comes the forum police.
Tell em I went to Notrees.
Honest I could not hep mysef.
BABRt's