Cast iron or steel?? - Graybeard Outdoors
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post #1 of 28 (permalink) Old 05-18-2020, 08:34 AM Thread Starter
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Default Cast iron or steel??

Is there a way to tell cast iron from steel if it is not obvious?
Can I weld cast iron to steel? It would be a lot of 1/2" tacks.
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post #2 of 28 (permalink) Old 05-18-2020, 09:23 AM
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Google says:

Yes you can weld cast iron to steel.

https://willmanind.com/can-i-weld-cast-iron-to-steel/


You tube says:

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post #3 of 28 (permalink) Old 05-19-2020, 06:14 PM Thread Starter
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My first try at welding steel to cast iron failed. The weld looked really good but the cast iron piece fell off when I picked it up.
There was absolutely no penetration in the cast iron. I did not preheat it.
I will try that next.
This is not cannon related but the process might be.


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post #4 of 28 (permalink) Old 05-19-2020, 11:53 PM
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While it can be done, welding cast iron to steel is more of a art . It can be very frustrating. I have known only one person that learned the old way of preheat and post-heating cast iron for welding. It can be very fussy work.
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post #5 of 28 (permalink) Old 05-20-2020, 01:11 AM
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I have never been able to weld cast iron but I have repaired broken cast iron parts using Everdur, which is a silicon bronze alloy. You preheat the pieces with the TIG torch and then start to apply the Everdur. It's a somewhat strange process as you are not melting the cast iron as you would if welding steel. But it produces a strong joint.

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post #6 of 28 (permalink) Old 05-20-2020, 08:05 AM Thread Starter
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Well, I failed at it yesterday.
I needed two 3/4" tacks joining steel to cast iron. The welds looked great.
When I picked it up, the cast iron part just fell off. There was absolutely no penetration at all.
I did not preheat it.


Back to the drawing board.
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post #7 of 28 (permalink) Old 05-20-2020, 08:18 AM
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Zulu, What are you using for electrodes? You need a high nickle electrode such as Weldcote nickle 99. In a pinch high nickle stainless electrode will work. In all cases you need preheat of 500 to 1200 degrees. Slow cooling is a must after welding, bury the part in lime, ashes, or heated sand. If this fails braising should work. Good luck!

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post #8 of 28 (permalink) Old 05-21-2020, 08:33 AM Thread Starter
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Quote:
Originally Posted by boomerralph View Post
Zulu, What are you using for electrodes? You need a high nickle electrode such as Weldcote nickle 99. In a pinch high nickle stainless electrode will work. In all cases you need preheat of 500 to 1200 degrees. Slow cooling is a must after welding, bury the part in lime, ashes, or heated sand. If this fails braising should work. Good luck!



I have no idea what electrodes I'm using. I'm really a novice welder even though I have messed around with it for 20 years.
First with a cracker box Lincoln stick welder for 18 years and now with a Hobart Mig. I'm still a novice.


The thing I'm welding on is too big to bury.
It is not cannon related but the welding process could be.
I'm willing to post pictures but it's not a cannon.

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Last edited by zulu; 05-21-2020 at 08:42 AM.
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post #9 of 28 (permalink) Old 05-21-2020, 08:58 AM
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post away Z. It's welding technique that could used in cannon construction.
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post #10 of 28 (permalink) Old 05-21-2020, 09:22 AM Thread Starter
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Thanks DD,
I am building a gate. It is a double gate with two swinging doors.

It is made from some of my huge collection of old rusty stuff I collected most of my life.
I have a lot!


I cleaned the rust off with an angle grinder and wire brush. At this point, the iron just has linseed oil on it.
The two side frames are from two old horse drawn plows.


The four spoke wheel near the middle of the picture is cast iron. It is on there now but I'm pretty certain it will fall off with the slightest touch.


The gate is 47" tall and 44" wide. It weighs about 200 lbs.


It will swing like a pair of saloon doors.
I think it is pretty cool.


I am currently making my post and barrel hinges.
The width at the top is equal to the width at the bottom even though it doesn't look that way in the pictures.


I also am currently pondering my cast iron problem. I would replace it with something else if I had something the right size.
But I don't.


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