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Re: Welding Anchor Bolts

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Robert,

I was looking for information on the A307 vs A36 because of the recent discussions.  Here's what I found:

The AISC LRFD Volume II, page 88, reads
  "... designations such as ASTM A325, A490, and A307 apply only to bolts manufactured with a head and it is, therefore, improper to specify unheaded anchor rods or similar threaded devices as ASTM A325, A490, or A307"

For headed anchor bolts, A307 appears to apply.  For unheaded bolts, J-bolts, etc. it appears to me that A36 applies.


David Finley




    -----Original Message-----
    From: Robert Rollo <rrollo(--nospam--at)TEAM-PSC.com>
    To: 'seaint(--nospam--at)seaint.org' <seaint(--nospam--at)seaint.org>
    Date: Monday, January 04, 1999 10:25 AM
    Subject: RE: Welding Anchor Bolts
    
    
        harold, please expound on why not A307, are you not specified correctly due to the: 

        "Specifically the A307 specification says "Nonheaded anchor bolts, either 
        straight or bent, to be used for structural purposes, shall conform to the 
        requirements of Specification A 36 with ....", 

        ? ? ? 

        
        
        
        -----Original Message----- 
        From:   John W. Bryan [SMTP:jaybryan(--nospam--at)voicenet.com] 
        Sent:   Monday, January 04, 1999 9:08 AM 
        To:     seaint(--nospam--at)seaint.org 
        Subject:        RE: Welding Anchor Bolts 

        Please educate me.  What is the "spark test" to determine carbon content 
        referred to in the message below? 

        -----Original Message----- 
        From:   Harold Sprague [mailto:harold.sprague(--nospam--at)neenan.com] 
        Sent:   Tuesday, December 29, 1998 10:01 PM 
        To:     'seaint(--nospam--at)seaint.org' 
        Subject:        RE: Welding Anchor Bolts 

        It is true that the A307 specification does not limit carbon content, but 
        anchor bolts of this type are generally manufactured from A36 stock which is 
        a low carbon steel.  Anchor bolts should never be specified as A307.  If you 
        push it you will find that few specified A307 "anchor bolts" will be truly 
        A307. 

        Specifically the A307 specification says "Nonheaded anchor bolts, either 
        straight or bent, to be used for structural purposes, shall conform to the 
        requirements of Specification A 36 with ...." 

        Even if the bolt is headed, anchor bolt lengths (and any bolt longer than 
        about 10") will generally prohibit mass production and will generally be hot 
        headed from A36 stock.  This is not a good practice either, but is another 
        topic. 

        A spark test on the bolt and the nut can confirm carbon content and will 
        dictate the welding procedure.  Then you can use the Temple sticks to 
        confirm preheat.  It would be best to minimize heat input to avoid damage to 
        the concrete.  It can be effectively welded by a good welder and a good 
        procedure. 

        Regards, 
        Harold Sprague 
        The Neenan Company 
        harold.sprague(--nospam--at)neenan.com