[TheForge] Brooms and Welding Cast

[Washington, Aubrey O.]

Greetings All,
 
For those who were following the cast iron welding discussion from last year, here is an update.
 
I was repairing a broken cast iron part on my old Acme post drill; the arm that advances the down-feed of the spindle.  It had broken at least twice before near the pivot hub.
 
I chose to oxy-acet. weld using Welco cast iron filler rod and flux.  The welding went okay, after I got used to the very liquid puddle of cast iron.  My weld included part of a previous weld using unknown filler.  The biggest problem I ran into was porosity in the previous weld.  In retrospect, I probably should have ground out all of the old weld, but that was a lot of material.
 
In any case, the new weld seems to be strong and I have put the part back into service.  I would conclude that this is a very viable alternative to brazing and nickel welding for small cast iron parts.
 
Thanks for all of your advice and consultation.
 
Aubrey
 
 

________________________________

From: theforge-bounces at mailman.qth.net on behalf of Peter Fels And Phoebe Palmer
Sent: Fri 12/16/2005 7:41 PM
To: Sponsored by ABANA
Subject: Re: [TheForge] Brooms and Welding Cast



Aubry: If you are repairing a bar like piece rather than a plate
or wheel, the effects of thermal distortion matter a lot less and
you can be much looser about pre and post heat. Brazing ought to
be the easiest and quickest in that case...just don't overheat
the cast before you lay the brazing rod on a well fluxed surface...PF

frosty at customcpu.com wrote:
> I understand, I have a couple post drills and know just what you're repairing.
>
> I wasn't saying you should stick weld it. I was saying I've never gas welded
> cast so I'd probably stick weld it but that's what I know how to do for sure.
>
> I might braze it too but I don't have it in hand so I can't say.
>
> One thing for certain, I'd forge or fab the replacement first. Just like you.
> <grin>
>
> Frosty
>
> Quoting "Washington, Aubrey O." <awashington at ou.edu>:
>
>
>>Frosty,
>> The piece I'm going to weld is more like 1/2 X 1" bar stock rather than
>>plate.  So I think gas welding should go okay.
>>
>>Aubrey
>>
>
>
>
>
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