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RE: A7 steel

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Lead Based Paint

-----Original Message-----
From: Padmanabhan Rajendran [mailto:rakamaka(--nospam--at)yahoo.com] 
Sent: Friday, April 15, 2005 3:06 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: A7 steel

What is LBP?

rajendran

--- Candi Anderson <canderson(--nospam--at)mercadoeng.com> wrote:
> Tom & Arvel (and whomever else wants to jump in:
> 
> This is a pedestrian truss bridge out in the middle
> of nowhere.  I'm not
> even sure its A7 but since I don't know when it was
> built and it does
> have LBP, I'm being conservative in that assumption.
> We need to add a
> connection plate near a joint at the end of one of
> the vertical members.
> Low stresses.
> 
> Candi
> 
>  
> 
> -----Original Message-----
> From: Arvel L. Williams, P.E.
> [mailto:awilliams(--nospam--at)gwsquared.com] 
> Sent: Friday, April 15, 2005 2:26 PM
> To: seaint(--nospam--at)seaint.org
> Subject: RE: A7 steel
> 
>  
> 
> Candi,
> 
>  
> 
> Step away from the Kool-Aid.  You probably can't
> effectively heat treat
> A7 in place on the bridge.  I think your big problem
> will be localized
> in the HAZ of the weld and depending on the size of
> the weld a potential
> fatigue problem.  If you component is fracture
> critical, as most older
> bridges are, this could be a real bummer.
> 
>  
> 
> Think about this, a lot.  The local metal guru can
> be more eloquent
> about this welding problem.
> 
>  
> 
> Arvel
> 
> -----Original Message-----
> From: Hans E Boge [mailto:Hanseb(--nospam--at)boge-boge.com]
> Sent: Friday, April 15, 2005 1:14 PM
> To: seaint(--nospam--at)seaint.org
> Subject: RE: A7 steel
> 
> Our office policy is not to weld to A7 steel for
> main structural
> elements.  
> 
> Not only is the welding difficult it adversely
> affects the parent
> material.
> 
> Handrails and light loads from cable trays are
> permitted on occasion.
> 
> I have never seen a welding procedure to a7 steel
> with modern steels.
> Anyone have one.
> 
> That being said, I have welded to A7 steels as a
> last resort, but then I
> put on lots.  Double what is typically required.
> 
> ----------------------------
> 
> Hans E. Boge, P. Eng.
> 
> Boge Boge (1980) Ltd.
> 
> 268 Ellen Street
> 
> Winnipeg MB, Canada, R3A 1A7
> 
> p:(204) 942-7276 ext 223
> 
> f:(204) 942-7288
> 
> www.boge-boge.com
> 
> hanseb(--nospam--at)boge-boge.com 
> 
> -----Original Message-----
> From: Candi Anderson
> [mailto:canderson(--nospam--at)mercadoeng.com]
> Sent: Friday, April 15, 2005 1:03 PM
> To: seaint(--nospam--at)seaint.org
> Subject: A7 steel
> 
> I'm past the LBP problem and move on to my next
> consideration: Can one
> weld to A7 steel?  I read that the carbon and
> manganese content can
> sometimes present welding problems and hence the
> development of A373 and
> then A36.  If the connection is too small/tight to
> accommodate bolting,
> is welding an option on this material?
> 
> Candi Anderson, P.E.
> 
> Associate/Chief Engineer
> 
> Mercado Consultants, Inc.
> 
> 17830 New Hampshire Ave.  #200
> 
> Ashton, Md 20861
> 
> Office: 301-260-0090;  FAX: 301-260-0018
> 
> 


		
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