[TheForge] Fw: Anvil repair

[G. Watts]

  I got the opportunity to certify and use the Cadweld system last year
while working on the steam generator repalacemant project at San Onofre
Nuclear Generating Station.  It's a neat way to splice  big bars, with lots
of fire and smoke and molten metal, but the splicing of big bars with
deformations is about the extent of its usefulness.  The inclusion of "weld"
in it's name is a bit of a misnomer, as the process uses an outer sleeve
that overlaps both sides of the butt joint (for #18 bars, the sleeves were
maybe 10-12" long) and has ridged deformations going circumferentially
around the interior of the sleeve, using a special crucible and pouring
appliance, cadweld powder is touched off, burns, melts and flows into the
void between the rebar and sleeve (the ends of the sleeve are sealed
(hopefully) with ceramic fiber rope packing held in place by collars).  The
finished product is nothing more than a mechanical interference-fit joint
held together by the poured metal locking in to the deformations on the
rebar and the inside of the sleeve...more on that here:
http://www.erico.com/products/CadweldRebar.asp
I understand that Cadweld has other products for welding on ground straps
and the like, but haven't used them, but the stuff I've seen is generally
copper bonded to steel...not sure on the particulars.
George.



-----Original Message-----
From: theforge-bounces at mailman.qth.net
[mailto:theforge-bounces at mailman.qth.net]On Behalf Of Andrew Vida
Sent: Sunday, December 12, 2010 9:41 AM
To: Blacksmithing List Sponsored by ABANA
Subject: Re: [TheForge] Fw: Anvil repair


Acronym is escaping me

wmullett at bright.net wrote:
> I have seen CAD Welding done on 1 1/2" rebar  Not sure what the material
used there is.
>
> ---- Original message ----
>> Date: Sun, 12 Dec 2010 09:58:08 -0500
>> From: theforge-bounces at mailman.qth.net (on behalf of Andrew Vida
<osan at netlabs.net>)
>> Subject: Re: [TheForge] Fw:  Anvil repair
>> To: Blacksmithing List Sponsored by ABANA <theforge at mailman.qth.net>
>>
>> Just had a thought, so take cover.
>>
>> Has anyone ever tried welding a face using thermit?  A think layer of
>> thermit interposed between the wrought body and steel face, clamped
>> elastically perhaps?  Light bugger off and watch the fun!
>>
>>
>>
>> CGRAF wrote:
>>> I seem to remember ( and Seeming to remember is happening more and more)
>>> that some of the tool steel tops were welded to the base of cast anvils
>>> by placing the heated steel plate in the mold and pouring the cast over
it.
>>>
>>> It might work, but I cannot find any corroborating documents in my piles
>>> of crap.
>>>
>>> At any rate it sounds less nasty than trying to forge weld a 3/4 inch
>>> plate onto a base.
>>>
>>> Am I remembering something real or just a dream?
>>>
>>> Mike Graf
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