How to weld cast Iron

Tue, 31 Aug 2021 15:35:39 GMT

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I have some one that wants me to weld a piece of cast iron. My question what the easiest way to weld it and any one have any good tricks. I have a hobart 210 mig, and a bobcat 250 stick welder I figured I would just stick weld it. What are your thoughts?
Reply:show us a pitcher..,or more description.. just to say a piece of cast iron does not permit any answer..the easiest  thing is to braze it,  not weld it..got  torch?
Reply:Na I don't have a torch I have a plasma lol. I dont have a picture of it its for one of my customers he said it was part of a lathe?
Reply:This is a good example of where a little how-to advice can be worse than none. If you don't know the basics of cast iron, you need to either get some good welding books, spend lots of time reading about it on the internet, or give up on the idea. A few short posts here are not going to give you enough knowledge to keep you from ruining the equipment worse than it is, I'd bet.
Reply:Originally Posted by GmmandanI have some one that wants me to weld a piece of cast iron. My question what the easiest way to weld it and any one have any good tricks. I have a hobart 210 mig, and a bobcat 250 stick welder I figured I would just stick weld it. What are your thoughts?
Reply:The man in the "Know" here is probably Castweld. Hopefully he'll chime in on this. If I had a critical part on a cast lathe for myself,  personally I'd PM him and see what he would want to do the job right..No government ever voluntarily reduces itself in size. Government programs, once launched, never disappear. Actually, a government bureau is the nearest thing to eternal life we'll ever see on this earth! Ronald Reagan
Reply:I meant to say that Everdure is silicon bronze, not phosphor bronze. I had brazing rod on my mind. Some brazing rod does have phosphorous and silicon in it. Everdure has glass.       Sincerely,             William McCormick
Reply:Either keep it very cool and weld only a little at a time and let it cool down ( all the way down) or preheat it and keep it hot. Weld it and then heat it again and let it cool very slowly. I'd use nickle stick rods or stainless steel as there is a little give in the stainless. The problem is that the cast is very brittle and as the weld cools it contracts. Streaching the parent metal om each side of the weld. As the cast is brittle then it can't take it so it cracks. Small repairs on cast I keep cool and weld an inch maybe and let cool to the touch. Then another bead. And so on. And vee out the joint.G
Reply:I have tigged the last few with stainless filler with good success. Keeping the heat down.G
Reply:Gotta line up with weldbead and Oldiron here.Is it a thin section, heavy section, tension/compression or shear? There are a number of solutions.I see you've been around the block with cold stainless (works very well for not blowing out carbon next to the weld and looking like chicken pox) but not good with cast in tension...Is this a gear quadrent (tension), saddle (compression) or headstock/tailstock (both depending on the break).Matt
Reply:i tig weld with ni-44 but i only do it once a yearcast weld is the best ive ever seen
Reply:I am siding with DSW this time. CastWeld is the man. Gray cast can be torch welded, believe it or not. Preheat, as I posted on a previous thread, needs to be in the 800* + range. Post weld cooling should be slooooooooow, to the tune of 12 hours slooow...If that is too slow for some who may read this, then I have nothing more to add. That is a major reason why brazing has so much appeal, unless you plan to use the repaired component in an environment above the melting point of the bronze filler metal, brazing would be ideal.Read up everything you can on welding cast iron....for instance...http://www.esabna.com/euweb/oxy_handbook/589oxy15_1.htm.Last edited by tanglediver; 08-07-2010 at 01:21 AM.City of L.A. Structural; Manual & Semi-Automatic;"Surely there is a mine for silver, and a place where gold is refined. Iron is taken from the earth, and copper is smelted from ore."Job 28:1,2Lincoln, Miller, Victor & ISV BibleDanny
Reply:GmmandanI would give some advise on how I would weld that cast iron, but I would need more info.  A lot of lathe parts are cast steel instead of cast iron. Did you see or test part to know if its cast iron?Peter
Reply:The customer never emailed me back which I am sorta glad. lol I am going to try to find some cast stuff so I can practice alittle bit for next time I don't really like to learn new things on customers toys.