Reply #42: Disagree all you want..

[zforce]

however, it doesn't change the fact that


Measured stress profiles across
weldments show that the weld stress relaxes gradually upon heating to temperatures between
300 °C and 600 °C. Using calibration techniques, it would be possible to characterize
temperature exposure with an estimated 50 °C accuracy. Regarding metastable phases,
irreversible phase transformations from an unidentified phase were seen at roughly 400 °C in
differential scanning calorimetry studies of weld metal. If the phase can be identified as a
common one for ferrous weldments, this technique could act as a .litmus. test for this
temperature.(NIST)

Further, time constraints and money constraints sound like an explanation, however there seems to be a couple of problems with such an explanation..One in particular, The NIST's ONGOING WTC 7 Investigation. For some reason or another this investigation doesn't seem to be constrained by time or money.

So the question is, why would the NIST feel constrained by time and money regarding the investigation into to WTC 1 and 2,yet feel no constraint with regard to WTC7?