[TheForge] Brooms and Welding Cast

[Bruce Freeman]

Maybe it's something like this?:
http://www.jwharris.com/welref/techguide/alloy_for_cast_iron/torch_weld/

Bruce
NJ

>>> wjec at verizon.net 12/9/2005 10:08:44 AM >>>
Jon,

I'd like to know exactly what that rod is, anyone know?

Regards,
Bill Woolley


----- Original Message ----- 
From: "Jonathan Nedbor" <jonned at hvc.rr.com>
To: <theforge at mailman.qth.net>
Sent: Friday, December 09, 2005 9:47 AM
Subject: [TheForge] Brooms and Welding Cast


> Thanks for all the leads on the brooms. Appreciate it .......
>
> As for welding cast iron, after I read the info on the "metal stiching" 
> website I'm amazed that I was ever able to weld cast iron successfully. I 
> have avoided using the nickel arc rod, as I find it looks terrible and is 
> a different color (which matters for some things).
>
> I don't know the name of the rod I use - someone out there will probably 
> know - it is about 1/4" square and looks like cast iron ie. "pebbly" 
> surface and mold marks. It is even brittle like cast. This stuff flows 
> great with TIG or torch. I have built up, modeled, broken/missing parts 
> with it, joined large pieces, etc. I even used it for an antique cast 
> pedestrian gate that had been badly broken in a attempted robbery.
>
> I have preheated and not preheated my repairs with success. I recommend 
> the preheat - till the piece glows dull orange - and welding while hot, 
> stopping to reheat if necessary. It is important to "V" out the weld area 
> to get good penetration and as Ralph mentioned to leave a little of the 
> original mating surfaces to "key" the positioning.
>
>
> I have found that there have been some things that I could not 
> successfully weld, I think that the items were exposed to extended periods 
> of heat in their lifetime, such as some old cast andirons and engine 
> parts - the weld area seems to keep "running" away, the liquid area keeps 
> receding.
>
> One question I have, someone mentioned that the preheat should use diesel 
> or nat. gas, not propane? I have used a large Johnson propane forge and my 
> coal fire for my preheating with no problems.
>
> Got a foot of snow outside and still coming down! Do I go skiing or stay 
> home and be responsible and work - tough choice!
>
> Jon Nedbor
>
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