Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Attention Forum Users: On the 28th of December 2023 at 9:00am Central Time, we will be taking the forums down for maintenance while we prepare the new forums for your use. Please click here for more information.

Tool Talk Discussion Forum

welding cast iron

Welcome Guest, Log in or Register
Author 
city farmer

11-24-2006 13:23:36




Report to Moderator

i have a cast iron pot that we use to fry fish in holds abour 5 gal very old some one droped it and it now has a crack down one side what are the best way to go about welding this up i have a mig and a stick machine thanks mark




[Log in to Reply]   [No Email]
george md

11-24-2006 22:37:20




Report to Moderator
 Re: welding cast iron in reply to city farmer, 11-24-2006 13:23:36  
Mark, The welding of a cast iron pot is an inherently
difficult process. The odds of success using nirod
is somewhere between nil and zilch.The reason is
that nirod has a tensil strength of 90,000 or more
and cast iron is about 30,000 and the nickel contracts at a rate many times that of cast iron.
You don't need to be an engineer to see what's going to happen .The cast pot is quite thin and
has very little structure to fight the shrinking
of the nickel , so even if you have some success
in the welding ,it will be full of hair line cracks. It appears the only one that answered you
that paid attention in welding class was mike in
ky .

You will need to build an oven out of fire brick
around the pot leaving a place to put a large propane torch , preheat to at least 900deg and
preferably 1200 and maintain that temp while welding with o/a and cast iron rod (cast iron in
stick form ). When finished post heat to about 1500 and hold for 15 to 20 minutes to normalize,
keep the brick piled tightly around the pot and
cover with a fire proof blanket . It should take
at least 10 hours to cool to room temp . If it cracks , it was not hot enough !!! About 1/2 of the jobs I get in the shop for the
last several years are cast iron repair . Some
are from other shops that won't do cast and some
are from the shops that try it with nickel and
fail , then I get to dig out the nickel also .
I do quite a bit of manifold repair on ones that
are not normally repairable .

george

[Log in to Reply]  [No Email]
MikeCatthemuseum

11-24-2006 21:59:58




Report to Moderator
 Re: welding cast iron in reply to city farmer, 11-24-2006 13:23:36  
Braze it with an OA torch or scrap it and get a new one. Welding somehting this thin with an electric rod is asking for a new crack, and you'll probably find out about it as it starts pouring boiling hot oil on to the fire below. Brazing is much less likely to crack as this thing repeatedly heats and cools.

If it were me, I wouldn't even take the chance with brazing in this situation. If you were boiling crawfish or steaming lobsters in it, it'd be a different story. It might make a mess, but it wouldn't blow up on you. 5 gals of 350degree oil over an open flame is a serious safety concern.

[Log in to Reply]  [No Email]
old

11-24-2006 16:27:24




Report to Moderator
 Re: welding cast iron in reply to city farmer, 11-24-2006 13:23:36  
Stick weld useing Ni-rod. Take the pot and stick it in the oven and heat it up as high as you can then if you can put it on the burner and weld it with the burner keeping it hot. Then keep it hot and slowly turn down the heat and cool it slowly. Ni-rod costs a lot, about a buck a stick but its worth it and is about the only thing you can wled cast with

[Log in to Reply]  [No Email]
wdTom

11-24-2006 14:35:33




Report to Moderator
 Re: welding cast iron in reply to city farmer, 11-24-2006 13:23:36  
If you stick weld with the nickle rod definately pre heat to maybe around 800 degrees. Gas grill works, or camp stove possibly. Make short welds and peen weld as soon as you finish the weld. By short I mean an inch or so. Step weld, that is start the next weld an inch or so from the last one and weld back to meet the last weld. Heat between welds to keep it hot. Cool very slowly, over an hour or more. And it might work.

[Log in to Reply]  [No Email]
Tcb

11-24-2006 13:43:48




Report to Moderator
 Re: welding cast iron in reply to city farmer, 11-24-2006 13:23:36  
City Farmer, I forgot to state the reason for preheating, when welding cast iron sometimes (most of the time) when the part starts to cool you can hear the weld cracking.
Tcb



[Log in to Reply]  [No Email]
Tcb

11-24-2006 13:40:27




Report to Moderator
 Re: welding cast iron in reply to city farmer, 11-24-2006 13:23:36  
City Farmer, you can go about this several different ways. You can vee the crack out then braze it up or you can vee the crack out, preheat the area and then use a nickle rod in your stick welder to weld up the crack. Hope this is helpful.
Tcb



[Log in to Reply]  [No Email]
MikeinKy

11-24-2006 18:51:18




Report to Moderator
 Re: welding cast iron in reply to Tcb, 11-24-2006 13:40:27  
Harris/welco makes a cast brazing rod that I have had very good luck with.



[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:


TRACTOR PARTS TRACTOR MANUALS
We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums


Copyright © 1997-2023 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy