Part 3/9:
Weld marks on steel components reveal spots of weak welding, which might have been critical failure points.
The document references investigations by the National Institute of Standards and Technology (NIST), pointing out that the beams did not weld together properly, which would have compromised their integrity under extreme stress.
Material and Engineering Concerns
The speaker criticizes the construction practices, implying that the steel and welding used in the Twin Towers were subpar. The small flanges on the trusses and the broken beams suggest engineering flaws or inferior materials that failed under the intense heat and force during the collapse.
Additional observations include:
- The presence of loosely fitting bolts and questionable weld quality.