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Tractor Talk Discussion Board

Re: Welding Cast Iron


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Posted by george md on June 06, 2007 at 20:42:13 from (12.177.53.139):

In Reply to: Welding Cast Iron posted by oldnnew on June 06, 2007 at 09:10:46:


If it is cast iron , yes you can weld it ,
but it is best done with oxy/acet and cast
iron rod ,NOT with arc weld . Here is a part
of an article written by Gary Reed about cast
iron welding . He is probably the most
knowledgeable person in the country about cast
iron repair. Link at the bottom to the rest of
the article .

" The most important thing for you to understand is that electric welding on cast iron is actually the very worst decision you could make to attempt to repair your cracked cast iron part. If you want to make a complete mess of your part, go ahead and arc weld it with nickel rod. Cast iron cannot stretch and withstand the contraction and hardening caused by cast welding with preheating below 1200 deg. F. The brand of welding rod does not make a very big difference. It's the heat that causes the changes to the cast iron itself. Sure the nickel weld is machineable but the cast iron will become as hard as a drill bit or tap and therefore will prevent the proper machining that is often required. 50% of the casting repairs we see have been arc welded on with disastrous results often costing the owner at least twice as much to repair properly."


george



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