Broken drawbar... chances a 'pro' welder can fix it

   / Broken drawbar... chances a 'pro' welder can fix it #111  
Try googling "does glass flow?" This was a persistent myth believed by many people. There are a lot of debunk articles on the internet. That shows how many people believed it, I did. There's no money in it so there's no real fight over it. Pretty much unanimous that its bunk.
 
   / Broken drawbar... chances a 'pro' welder can fix it #112  
Now we also have Liquid Metal.
 
   / Broken drawbar... chances a 'pro' welder can fix it #113  
Don't know about flowing glass. I've saw windows with ripples or waves in the glass. Guess it "flowed" at some point. :)
 
   / Broken drawbar... chances a 'pro' welder can fix it #114  
Don't know about flowing glass. I've saw windows with ripples or waves in the glass. Guess it "flowed" at some point. :)
But that's just irregularities from the original manufacture.

This old farmhouse has windows like that. Makes you crazy to watch a bird or something move across your field of view.

I've read that modern flat glass started around WWII. Possibly based on pouring melted glass onto a film of melted murcury which as a liquid would be dead flat.

But no, glass doesn't flow after it has cooled. See Snopes.
 
   / Broken drawbar... chances a 'pro' welder can fix it #115  
But that's just irregularities from the original manufacture.

This old farmhouse has windows like that. Makes you crazy to watch a bird or something move across your field of view.

I've read that modern flat glass started around WWII. Possibly based on pouring melted glass onto a film of melted murcury which as a liquid would be dead flat.

But no, glass doesn't flow after it has cooled. See Snopes.

Oh I believe you. But to get back on track, I said glass deforms or bends before it breaks. Anyone want to contradict that? :)
 
   / Broken drawbar... chances a 'pro' welder can fix it #116  
But to get back on track, I said glass deforms or bends before it breaks. Anyone want to contradict that? :)
No contradiction here. An acquaintance who ran a glass shop said you can force new glass and bend it a little to get it into a frame; old glass will shatter instead. I believe him.

I wouldn't expect it to deform though.
 
   / Broken drawbar... chances a 'pro' welder can fix it #117  
No contradiction here. An acquaintance who ran a glass shop said you can force new glass and bend it a little to get it into a frame; old glass will shatter instead. I believe him.

I wouldn't expect it to deform though.

All glass can be bent some. long thin pieces of glass can be bent a lot. Fiber optic glass can be bent in about a 4 inch radius with no damage. tighter radii can cause problems.. Glass bends right up to the point it goes boom. There are some new varieties of glass that can be bent much much more.

 
   / Broken drawbar... chances a 'pro' welder can fix it #118  
Yep. And I believe the OP's drawbar bent right up to the point it went boom. Whether that can be proven by inspecting the pieces is dependent on the observers technical intellect. Same with inspecting a pile of shattered glass. :)
 
   / Broken drawbar... chances a 'pro' welder can fix it #119  
Oh I believe you. But to get back on track, I said glass deforms or bends before it breaks. Anyone want to contradict that? :)
Sure... well sort of... okay not really but... Glass will bend (strain) when you stress it but it will return to its original undeflected shape. That is the 'elastic' part of the stress/strain curve. Many materials can also strain past their yield point without breaking. That is the 'plastic' part of the stress/strain curve. In this case the material will not return to its original undeflected shape. Glass will deform elastically but not plastically. In other words, the yield stress and ultimate stress are the same.
 
   / Broken drawbar... chances a 'pro' welder can fix it #120  
Sure... well sort of... okay not really but... Glass will bend (strain) when you stress it but it will return to its original undeflected shape. That is the 'elastic' part of the stress/strain curve. Many materials can also strain past their yield point without breaking. That is the 'plastic' part of the stress/strain curve. In this case the material will not return to its original undeflected shape. Glass will deform elastically but not plastically. In other words, the yield stress and ultimate stress are the same.

Are you agreeing with me or not??? I sortta lost track in there somewhere. :)
 

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