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Cast Iron Welding

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Mike

01-18-2001 09:09:08




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What's the best way to weld cast iron?
Windmills




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Fred OH

01-19-2001 07:15:13




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 Re: Cast Iron Welding in reply to Mike, 01-18-2001 09:09:08  
Each job that comes into a welding shop is sized up as to what it is for. That has a lot to do with how it is welded. Also if it has a bearing or seal nearby, or if it is full of grease. Pretty hard to weld something with a torch that the owner insists that he needs to save the seal or bearing.
Brazing is a mechanical bonded process, it doesn't fuse together like arc, mig or tig and also requires more skill as far as preparation and method and requires a lot of heat in the part to be brazed.
Arc welding is fusion bonded, uses specialized rod, and is touchy because of cast irons sensitivity to cracking. It is very slow because you generally weld 1" and then peen real good with a ballpein hammer to relieve stresses and let cool till you can put your hand on it before the next bead. Sometimes you can preheat the whole casting to speed up the process. You can even mis-identify it, it may be malleable iron and they just switched pitchers on you! If you don't have experience with CI, it should go to a welding shop. A good book and experimentation will get you started or a welding course is best. Food for thought: insurance tables say bad things about welder's health. Just so you'll be informed, that's what the board is for. L8R----Fred OH

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T_Bone

01-18-2001 21:59:56




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 Re: Cast Iron Welding in reply to Mike, 01-18-2001 09:09:08  
Hi Mike, You do want to clean the surface for 1" on either side of the joint as the surface holds alot of impurties, v-notch if a 1/4" or more, preheat to 900F to 1200F, weld with a ni-cad rod, then cool slowly as in covering with sand to room temperature.

Any electrode rated for welding cast iron or with my choice oxyacetylene with fluxed filler rod as you preheat as you weld. This applys to gray cast iron.

If you have a different type of cast iron then the method might be different.

T_Bone

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Steve

01-18-2001 17:34:57




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 Re: Cast Iron Welding in reply to Mike, 01-18-2001 09:09:08  
For best results clean joint well, V out the joint, preheat pieces to be welded, then arc weld it with stainless arc rod, and let it cool slowly. If you have access to a bag of lime bury the welded piece in the lime. This will allow it to cool very slowly and prevent fractures. Good luck!



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Erich

01-18-2001 16:03:29




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 Re: Cast Iron Welding in reply to Mike, 01-18-2001 09:09:08  
It's been a while since I've done it, but as I recall the best way is actually to braze it in most cases. I've done some cast iron welding with cast iron rod and a gas welding outfit. That is done much like brazing, however, as I remember, it was harder to get a strong and good looking result. If it is necessary to have raw metal showing then cast iron welding would be best. It can be ground and then sand blasted to be almost invisible.

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hogman

01-19-2001 18:51:43




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 Re: Re: Cast Iron Welding in reply to Erich, 01-18-2001 16:03:29  
i've done a little castiron welding,bought ni-rod in 25# lots... air compressor casting that were broken were my main jobs [steady]. i found no heat,use copper plate to start and end each pass,and to save ni-rod if weld section is very thick get a good wash with n-r first and go to 6011 or 13. don't let it get too hot. take care if weld must be machined as ni'rod is awful stuff,gummy and will work harden real quick. i ground all that i could but if had no way but machine, cutters should be sharper'n sharp !!!!!

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