"I'm not aware of a continuous cooling curve for the A992 steel, but suspect that if proper preheat is used for the thickness to be welded, then the cooling rate would not be fast enough to form martensite when welding is complete."-quote
They were my thoughts exactly, here in the shop I can monitor the guys and make certain enough heat has been kept in the part before and during welding, but I'm afraid that the erector and his men are the ones we'll have trouble with. I'll get with our field representative and see if he can help me with the monitoring in the field. Meanwhile, I want to get into those links that you provided and study up.
Thanks for your help,
John Wright
Edit: Marty, C3.5 basically states what you and I were thinking all along, when sufficient preheat is used, the cooling rate will be slowed enough to produce a crack-free joint.
Edit#2: also maintaining sufficient interpass temperature between passes when it cold on the jobsite.