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Tool Talk Discussion Forum

Re: How To Weld Cast Iron... Like A Cheapskate

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george md

11-26-2012 00:25:32

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Anyone that tells you that you can get a strong weld with any type of arc weld is most likely full of some kind of compost. One possible method with arc is to heat to 900 to 1000deg f and weld with a nickel alloy of your choice , typically no one is any better than the next as they are all in the range 90k tensile and cast is rarely over 50k.

I think this is your chance to learn to weld cast with a torch and cast iron rod ( cast iron in stick form). I have welded vises and one of them I use every day ,done with cast rod and torch. Basically for a vise if you want success, weld it with a torch , if you want it to fail in use ,arc weld it. I undo a lot of arc weld damage and redo it with torch.

If you want to chat about it send me a phone number and I'll call you.


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11-26-2012 17:07:12

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 Re: How To Weld Cast Iron... Like A Cheapskate in reply to george md, 11-26-2012 00:25:32  
I too have a small vice that I bought broke and need to weld it. I am going to do the oxygen/acetylene weld. When I was in welding school 40 some years ago we used a square (cast) filler rod. Is there only one type of cast rod? I am guessing there is round rod also. Since welding school I have only used Nickel electrode. Since seeing your work I will go back to oxygen/acetylene where possible.

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11-26-2012 03:35:12

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 Re: How To Weld Cast Iron... Like A Cheapskate in reply to george md, 11-26-2012 00:25:32  
george md, I for one would be very interested in reading about your technique for welding cast iron with a torch! I can probably count on one hand how many times I've had to repair cast iron. Now cast steel I've done numerous repairs on pile driving equipment. For years the company would buy a rod by Welco, called Super Missile Weld. Basically just a more expensive 312 stainless steel. Later we just started using 7018. Now this was on cast steel, not cast iron.
I think this was posted by member Cast Weld on Welding Web forum. If I remember correctly he repairs cast iron for a living.
I do a lot of cast iron repairs with 100% success so far. Last year, after several months of research, I found information on a couple websites & mostly in an old Lincoln Welding book. The process is called "Cold Welding Cast Iron With MIG". I practiced several weeks on broken cast iron parts & broken/cracked manifolds my bro' gave me to get my technique down pat. It has worked with superb results.

I use MIG, 309/309L .030 wire, 98/2(AR/CO2) @15cfh & generally in the 80A range. You can use any gas with a mix of no more than 5% CO2 (ex:95/5). The 309 wire has a carbon content of .01 & works best. The idea is to keep the temperature cool by running short beads <1" & allowing the joint to cool before continuing. After running the short bead, you can take your glove off & lay your hand on the metal & will feel only warm to the touch. Since your pieces are not large, I would suggest shorter 1/2" beads & allow each weld to cool back to room temp before continuing.

On Tractorbynet forum there is a member there who goes by yomax4, he does a lot of cast iron repair with Spray Powder Torch.

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george md

11-26-2012 15:30:40

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 Re: How To Weld Cast Iron... Like A Cheapskate in reply to Puddles, 11-26-2012 03:35:12  


I would be delighted to chat with you about the process and welding in general. I used chat with T-Bone every now and again , sure miss him.

Send me an email with a phone # and I'll call, I'm always here till at least midnite.


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11-26-2012 15:40:49

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 Re: How To Weld Cast Iron... Like A Cheapskate in reply to george md, 11-26-2012 15:30:40  
Email sent George.

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60 Acre Hillside

11-26-2012 04:11:33

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 Re: How To Weld Cast Iron... Like A Cheapskate in reply to Puddles, 11-26-2012 03:35:12  
It looks like your third paragraph contradicts the first paragraph. I know you have much experience and I respect your opinions but please explain.

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Stan in Oly, WA

11-26-2012 13:18:50

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 Re: How To Weld Cast Iron... Like A Cheapskate in reply to 60 Acre Hillside, 11-26-2012 04:11:33  
The third paragraph is quoted from another source, as stated in the 2nd paragraph. Not as clear as it might have been with quotation marks, but besides being one of the most knowledgeable contributors on this site, Puddles is also one of the most articulate. I wouldn't begrudge him a couple of quotation marks.


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