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Welding cast

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Jon

04-01-2003 17:11:53




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I have an old IH sickle bar mower and when replacing the wheel the cast hub broke.Now this hub is all one piece and connects to the frame of the mower.Does anyone have any tips on welding cast?




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john

04-09-2003 19:33:19




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 Re: welding cast in reply to Jon, 04-01-2003 17:11:53  
i have good luck "ving" out the crack, welding only a small portion of the crack and pecking on it with a chipping hammer while it cools and then leave it alone for a while and come back and weld some more on it after it cools down. don't weld on it for very long and don't beat it to death, just pecking on it relieves the stress in the weld



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Jack

04-05-2003 05:44:30




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 Re: welding cast in reply to Jon, 04-01-2003 17:11:53  
First get it hot(450 Degree) weld with nickle rod and when done hold the heat in this piece for as long as you can.Put it in a bag of lime,portland,or just plain ol sand.You need to hold the heat in and let cool over a 24 hour time period.Don't get in hurry to uncover it to see if it is cooled down.Just wait for 24 hours and then it will be ready to put back on.



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Don-WI

04-01-2003 20:21:07




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 Re: welding cast in reply to Jon, 04-01-2003 17:11:53  
Use a NI-CAD rod, and reverse the polarity. If you buy a package of NI-CAD rods, follow the directions on the package. Also, if possible, gind a bevel into the cast and fill it in, cleaning the slag between passes. I have welded a cast hitch for my 14' JD disk, and it is still holding up just fine.
Donovan from Wisconsin



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Mike

04-02-2003 03:05:01




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 Re: Re: welding cast in reply to Don-WI, 04-01-2003 20:21:07  
All the advie you've been given so far is good.You do need a NI-Cad rod but you also need to heat the whole casting up before welding.As a weld cools it contrats and in doing so causes the cooler areas of cast to crack.In heating up the whole part and letting it cool by itself your less likely to crack.Depending on the size of the part I use a gas grill or a kersone heater to heat up parts.Good Luck.

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David

04-01-2003 18:26:31




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 Re: welding cast in reply to Jon, 04-01-2003 17:11:53  
I'm not an expert in metals or welding but I did just complete a job similer to this. I had to build up an engine block where a starter bolt broke off. The advise I got was
Use a 7018 rod Peen it with a slag hammer as it cools to prevent cracking Dont set the amps of the welder to high Also the quality of the cast makes a big diffrence in the finished product.My project turned out great it did take about 8 hours to complete good luck

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James

04-01-2003 19:14:05




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 Re: Re: welding cast in reply to David, 04-01-2003 18:26:31  
Ask an expert. That is not me. I think you should use nickle rod.



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Jon

04-02-2003 04:38:20




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 Re: Re: Re: welding cast in reply to James, 04-01-2003 19:14:05  
Thanks for all of your advice.



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