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Welding Malleable iron

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GPWT

03-20-2002 09:53:12




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I have a malleable iron (not grey iron) front axle beam from an early JD "D" that needs a small weld repair. The beam has an "I" beam cross section, with a circular boss through the web in the center. The boss is bored out for the axle pivot pin and one end of the boss is split on a side. Any suggestions for welding this? Brazing? What needs to be done to prevent the iron from turning back into the white iron that it once was before it was converted into malleable?

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greg

03-20-2002 15:18:45




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 Re: Welding Malleable iron in reply to GPWT, 03-20-2002 09:53:12  
Of course use rod for malleable repairs, I have heard welding instructors talk about welding cast, and it seemed that regardless of type, the general consensus was to heat the whole casting evenly to 600 -700 degrees F, perform the repair maintaining as close as possible to this temp, and slowly reduce heat to the item, or wrap it in special blankets intended for the purpose of holding heat in welded castings, to allow it to cool as slow as possible. 12 -24 hours required. Feel free to wait for other replies to this issue, as I would hate to see you lose a casting due to my suggestion, especially if someone with more hands-on can give you a better answer. Good luck.

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ralph

03-20-2002 17:25:46




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 Re: Re: Welding Malleable iron in reply to greg, 03-20-2002 15:18:45  
In addition to the heat I have also been taught to peen the weld after each pass, this is to relieve some of the stress, it seems to work. ralph



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boog

03-21-2002 19:41:37




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 Re: Re: Re: Welding Malleable iron in reply to ralph, 03-20-2002 17:25:46  
Dad, who had a machine shop before becoming a welding engineer for a large national corp., also taught me to peen after weding cast. Also, he said if you could not heat and gradually coolthen weld very short beads of no more than 1/2". Then peen and walk away and not weld again until you can lay your bare hand on the previous weld.

I have welded several pieces of cast in this manner and have been very successful. I prefer using a nickle rod.

Lots of luck
boog

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