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Jul 21st, 2025 | | | | Joined: Jan 2006 Posts: 15 New Guy | | New Guy Joined: Jan 2006 Posts: 15 | was recently reading a thread here concerning splitting an existing 235 manifold. i.b. hoggin had some interesting pics on his web site. would like to hear more about how it came out? I'm no welder so asked a friend here at my work about it. he has taught welding classes at local jr college and is fairly knowlegable in the art of welding. have almost talked him into doing one for me but he needs more info pertaining to type of rod used etc. he felt that welding a standard heavy elbow to cast iron might cause problems and lead to cracking. can anyone shed some light on this mystery for me?
thanks
ole b97 | | | | | Joined: Mar 2005 Posts: 1,513 'Bolter | | 'Bolter Joined: Mar 2005 Posts: 1,513 | I don't have any more pic's as of yet and squeezing spare time out of the welders isn't easy lately but my pipe is now attached to the front half and it went good. The front pipe is actually a little further back than the pic's show after test fitting in the truck. The welding rod is UTP FN 85 cast rod in 1/8" diameter. He used an air hammer on a low setting and peened the weld while it was still hot. He was suprised at how stable the old iron was. Still have to attach the flange and the other blockoff plate. Another update later.
Curt B.
1952 1300 Canadian 1/2 ton restomod You Tube | | | | | Joined: Dec 2001 Posts: 215 Shop Shark | | Shop Shark Joined: Dec 2001 Posts: 215 | Another good trick for welding cast iron
is to put th part in a bucket of sand after welding to slow cooling process (fast cooling leads to cracks)
also make shure what ever rod you use has high Nickel content (more flexible)
also clean cast iron realy well make shure there is no oil or grease in the iron | | | | | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | oleb97,
As the two gentlemen have indicated, arc welding cast iron requires that certain procedures be followed. Cast iron is very high in carbon, and this is where the problems arise.
When you weld cast iron, and melt the parent metal, it goes through various states as it cools. The formation of Martensite is what causes it to crack. If you can preheat, weld, and post heat, you can help eliminate these brittle deposits.
Peening the weld bead between passes will keep it from shrinking as much, and cracking away from the casting.
Many people braze cast iron. This procedure doesn't melt the base material.
Cast iron is welded every day successfully, you just have to know the "procedure" and follow it to get the proper results.
This is turning into a novel. I am not familiar with arc welding carbon steel to cast iron. Curt's welder sounds like he has this dialed in.
To get net, you have to have the proper rod and follow the proper procedures to make it work satisfactorily. I wouldn't make my first attempt a split manifold unless I had a tutor to guide me.
Stuart | | |
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