there are too many pics at this link to begin to show them here. best go to the site and see what is being presented;

The photograph below demonstrates that the WTC beams were not cut by welders.

Because of fuel and time constraints welders would have used a cutting torch to cut the shortest distance possible - straight across the beams. Also, cutting torches cut by forced oxidation, therefore the large amount of once liquid metal congealed on the beam would not be present.

http://www.whatreallyhappened.com/WRHARTICLES/wtc_charges.html