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RE: Welding Base Plate to Grade 8 Bolt

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It may be possible to weld the bolts. But as Steve pointed out, the high
strength of the bolts is obtained from heat treatment, so welding will
reduce the strength. With no further information, basically assume the bolts
after welding are no stronger than grade 4.6, possibly even less. Thus no
point to using the grade 8 bolts.

Here AISC/ASI issued notice advising against welding grade 8 bolts into
anchor cages. Also special nuts are available for welding to plates.


Regards
Conrad Harrison
B.Tech (mfg & mech), MIIE, gradTIEAust
mailto:sch.tectonic(--nospam--at)bigpond.com
Adelaide
South Australia


-----Original Message-----
From: Liaquat Ally Akhand [mailto:laakhand(--nospam--at)gmail.com] 
Sent: Wednesday, 22 July 2009 10:03
To: seaint(--nospam--at)seaint.org
Subject: Re: Welding Base Plate to Grade 8 Bolt

Dear,

The bolts can be welded. We did it in some cases.

Regards,

On Wed, Jul 22, 2009 at 1:16 AM, SGE
Structural<sgordin(--nospam--at)sgeconsulting.com> wrote:
> Daryl,
>
> It looks like Grade 8 bolts (SAE) may be quenched and tempered, and,
> therefore, may loose strength when exposed to welding.  For "very small
> loads" it may not matter, but you still may want to check the specs.
>
> V. Steve Gordin, SE
> Irvine CA
>
> ----- Original Message -----
>
> From: Daryl Richardson
> To: seaint(--nospam--at)seaint.org
> Sent: Tuesday, July 21, 2009 10:04
> Subject: Welding Base Plate to Grade 8 Bolt
> Fellow engineers,
>
>         I have a client who wants to secure a base plate to a floor using
> Grade 8 bolts.  The intent is to have the threaded end down and epoxied
into
> the floor; a leveling nut will be between the floor and the base plate to
> properly position the plate for grouting; the bolt head will be cut off
the
> plate will be placed over top and welded to the bolts with some
combination
> of plug and fillet welds through the anchor bolt holes.  The purpose is to
> have a flush surface with no protruding bolts or nuts.  The loads on the
> A-Bolts should be very small.
>
>         My question is this: is the Grade 8 bolt material compatible with
> mild steel plate for welding purposes?
>
>         I realize this is grossly over-designed; but, hey, it's the
client's
> design and his money.  It's what he wants to do.
>
> Regards,
>
> H. Daryl Richardson

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