Preheat lapse before Monday welding

Same mis-sequencing analogy as above. Steel preheated Friday, welded Monday — the preheat had long dissipated. ## Materials referenced (not cases)

Once they got it, they sliced it up like a bologna, machined it, and reheat-treated it. When they reheat-treated it, they wiped out the stretching that had relieved the residual stresses. They introduced new residual stresses on quenching, and they didn't do anything to relieve them. Well, they said, "We purchased it stress relieved." Yeah, but then you reheat-treated it and you reintroduced residual stresses. This is sort of like the guys who said, "We preheated that steel on Friday and they're welding on Monday." Or like the guys at the jet engine company — "Oh well, we put it into the furnace to diffuse out the hydrogen within four hours of getting the test report back three days later from the test lab." Oh great. They didn't understand the physics or chemistry of what they were dealing with.