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Tractor Pulling Discussion Forum

Furnace Brazing

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superih

03-17-2005 16:25:04




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What is the furnace brazing process and why is it the preferred mothod of fusing sleeves in a block?

Thanks

LC




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Andy2

03-17-2005 19:56:32




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 Re: Furnace Brazing in reply to superih, 03-17-2005 16:25:04  
It greatly reduces internal stress cause by heat from welding and cool portions of the block by heating the entire block. this can prevent cracks down the road.



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CASEPOWER

03-17-2005 18:37:30




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 Re: Furnace Brazing in reply to superih, 03-17-2005 16:25:04  
Just as with any kind of welding or brazing, the problem of getting two pieces of metal or cast the same high temp without melting one and failing to get the other hot enough to bond. You could easily melt a sleeve, long before getting the block hot enough to hold the braze or make a weld penetrate. It also slows the cooling process were cast is known for cracking.



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superih

03-18-2005 05:29:52




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 Re: Furnace Brazing in reply to CASEPOWER, 03-17-2005 18:37:30  
Is the brazing done after the hot assembly comes out of the furnace? I am just curious of how it is done. Thanks for the replies.



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CASEPOWER

03-18-2005 07:12:05




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 Re: Furnace Brazing in reply to superih, 03-18-2005 05:29:52  
Most are on a roller shelf that is rolled out while hot, welded for a bit, then rolled back in to stay hot. I am not sure what temp they prefer to weld or braze for different type materials.



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superih

03-18-2005 08:39:27




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 Re: Furnace Brazing in reply to CASEPOWER, 03-18-2005 07:12:05  
So it can be either welded or brazed or maybe even soldiered? By inspecting an engine that is already together how can you tell if it has been furnace brazed? I have a basket case Farmall M engine 4 5/8" bore that I aquired and am trying to figure out if the sleeves have been brazed in. Can I have the sleeves brazed in a motor that has already been used and that has been hard blocked?

Thanks

Luke Cornell

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Drew

03-18-2005 16:49:30




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 Re: Furnace Brazing in reply to superih, 03-18-2005 08:39:27  
All the blocks that I have seen with furnace brazed sleeves are a copper color. Unless someone painted the inside of the engine, this coloring should still be present if the sleeves have been brazed in.



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