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Text 20880, 54 rader
Skriven 2006-01-03 11:15:08 av Roy Witt (1:1/22)
  Kommentar till text 20850 av Michiel van der Vlist (2:280/5555)
Ärende: WTC fire         (was; La
=================================
03 Jan 06 10:18, Michiel van der Vlist wrote to Roy Witt:


 >>>> "Soldered"?!?!?   Soldering is a very weak technique.  I'd
 >>>> think they'd have been better off *welding* the girder.

 MvdV>>> As ever so often you are looking at it from too narrow a point of
 MvdV>>> view. Soldering is the technique of joining pieces of metal with
 MvdV>>> a another metal that has a lower melting point than the the metal
 MvdV>>> of the pieces to be joined. The strength of the joint very much
 MvdV>>> depends on *what* you use as solder. You are probally thinking of
 MvdV>>> the classical tin/lead alloy. That indeed is not very strong. But
 MvdV>>> there are other "solders" that result in a much stronger joint.
 MvdV>>> Some even stronger than welding. Popular along jewelers is a
 MvdV>>> mixture of silver, copper and zinc.

 >> Do any of you realize how tedius of a job it would be to solder those
 >> joints?

 MvdV> Not more tedious than welding or bolting.

Very much so. The first thing that comes to mind would be the heat
required to solder or braze those girders. That would take more time than
inserting a bolt and tightening down a nut and washer, ten times over.
Welding by arc or wire feed would be the way to go if you're looking for
speed. However, the need for the machines to do the welding would require
more time wasted in getting them to the site.

 >> It's not like you're soldering a gold ring together. Not to
 >> mention that a 'soldered' girder joint wouldn't last 5 minutes
 >> in a building, even if it was possible to solder it.

 MvdV> If you can weld it, you can solder it.

Wrong.

 MvdV> And with the proper "solder" such a joint is just as strong or even
 MvdV> stronger than a welded joint.

Wrong again. The key word here is penetration. Solder or even silver
solder is not as strong a weld for the very fact that solder will not
penetrate the parent material as deeply as an electric arc.

 MvdV> The main reason hard soldering is not used on a large scale is
 MvdV> cost. Welding is much cheaper.

The main reason soldering isn't used on a large scale is because it's
time consuming and has less strength than welding. Cost is a factor,
but it's the combination of cost vs time that is the reason it's not used.


Roy
--- Twit(t) Filter v2.1 (C) 2000
 * Origin: Hacienda de Rio de Guadalupe * South * Texas, USA * (1:1/22)