Man, we had the exact same thing happen on a warehouse job in Toledo last fall. Cracked weld on a column base plate after the concrete set, cost us two days of grinding and rework. In our case, the foreman finally admitted they never did the proper interpass temperature checks. It's always a blame game between procedure and prep, but skipping steps to save a few hours always bites you later lol. My call is you gotta enforce the checklist every single time, even when the crew complains about slowing down.