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Welding cast iron

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STEWARTINPA

03-29-2008 02:06:23




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I know cast iron is very hard to weld I've done little things like ears on carbs but my newest project is a Case C with a cast oil pan and it has a crack about 16" long on one side and 5" crack on the outher side. I have nickle rods but would it be better to braze it?

Thanks Stewart




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Clarkbug

03-31-2008 04:12:10




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 Re: Welding cast iron in reply to STEWARTINPA, 03-29-2008 02:06:23  
Maybe this will help!

Welding Cast



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minn meyer

03-30-2008 07:34:24




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 Re: Welding cast iron in reply to STEWARTINPA, 03-29-2008 02:06:23  
Welding this is going to be a major project.How about finding a used oil pan.Or clean it up real good and try some J.B.Weld on it.



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farmerjohninpa

03-29-2008 20:11:07




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 Re: Welding cast iron in reply to STEWARTINPA, 03-29-2008 02:06:23  
i would go with the brazing technique! if ya have a bbq [propane] turn it on about 1/4 heat for 45 minutes with the pan inside, and then on high for about 15 minutes,get your hot iron gloves / tongs and proceed to braze it.set bbq back to low heat. BERNIE is right, drill a small hole at the end of the cracks or the crack will continue to run ahead of the heat. after brazeing , place pan back into bbq that is on low heat and after an hour or so turn it off and leave the pan there with the lid closed until tomorrow. check for level on gasket surface.

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Don L C

03-29-2008 14:17:56




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 Re: Welding cast iron in reply to STEWARTINPA, 03-29-2008 02:06:23  
After you get it welded.....check to see if the gasket surface is flat with a straight edge..... it will help if you use two gagkets..... tighten the bolts up in about three times tightening on the bolts .....start in the center of both sides.....



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:RIVIR

03-29-2008 12:55:23




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 Re: Welding cast iron in reply to STEWARTINPA, 03-29-2008 02:06:23  
back to stainless steel rod , im only saying its gonna seal up your crack in your oil pan, your not gonna pull a plow with your weld, and its gonna look nice too.



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Janicholson

03-29-2008 07:57:04




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 Re: Welding cast iron in reply to STEWARTINPA, 03-29-2008 02:06:23  
I was reading Modern Welding (a 1960s copy) preheating thin material to 450 or 500 degrees, then using nickel rod and fresh clean rust free joint will do well (slow cooling, short passes in the middle first, then stitching 1" sections, clean after each stitch to assure no inclusions. Bolting it to something is a great idea as well to hold shape. I would braze it if I had no Ni rod, or appropriate welder (great book by the way) JimN

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LN

03-29-2008 07:16:53




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 Re: Welding cast iron in reply to STEWARTINPA, 03-29-2008 02:06:23  
another option on flat surfaces with cracks is to( dry stitch) them any good machine shop can do this or sell you the kit to do it . To do this you drill holes in the crack, tap it out then wind the special cast iron stitch plug in, drill another hole repeat process over and over till crack is repaired then peen the plugs to have a repair that will hold forever without the heat of welding have had good success doing this with several cylinder blocks and a couple of heads may work with your pan

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Steven f/AZ

03-29-2008 05:58:12




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 Re: Welding cast iron in reply to STEWARTINPA, 03-29-2008 02:06:23  
I've had good luck with stainless and nickel rods in the old AC Lincoln stick welder. Weld about an inch, let cool, weld another inch, cool, etc.

The big cast iron welding project Dad and I did together one of us held the torch on it to keep in warm and then gradually moved the torch away when done to cool it slowly.



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:RIVIR

03-29-2008 05:37:41




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 Re: Welding cast iron in reply to STEWARTINPA, 03-29-2008 02:06:23  
try stainless steel rod on say 4" of crack and see what you think, i use stainless steel on thin cast cast and figure it flows together good, but thats my opinion,



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philo-mm

03-29-2008 03:10:47




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 Re: Welding cast iron in reply to STEWARTINPA, 03-29-2008 02:06:23  
I have heard that you want to get the cast iron heated up slowly and let it cool down slowly. I have welded on cast iron with nickel rod before with no trouble but you have to weld a little bit and quit. Don't try to weld a bunch and get it hot. It may do as well to put a forced air heater on it and warm it up even. Also lay the pan flat so it does not warp. I had a manifold that warped badly b/c I did not have it flat while I welded on it.

Ryan

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Bernie Steffen

03-29-2008 07:03:59




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 Re: Welding cast iron in reply to philo-mm, 03-29-2008 03:10:47  
Another good idea is if you can fine the end of the crack, drill a hole at the end. If you don"t the crack will probably run when you weld it. Just my two cents worth. Bernie Steffen



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