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RE: Welding Anchor Bolts[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: RE: Welding Anchor Bolts
- From: Harold Sprague <harold.sprague(--nospam--at)neenan.com>
- Date: Tue, 29 Dec 1998 20:00:54 -0700
Dick, 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 -----Original Message----- From: Horning, Dick/CVO [mailto:dhorning(--nospam--at)CH2M.com] Sent: Tuesday, December 29, 1998 10:17 AM To: 'seaint(--nospam--at)seaint.org' Subject: RE: Welding Anchor Bolts I'm a little dubious about welding on A 307 since the carbon is uncontrolled. At the least, you would want to know the carbon equivalent to determine preheat/postheat requirements similar to welding A 615 rebar. -----Original Message----- From: John W. Bryan [SMTP:jaybryan(--nospam--at)voicenet.com] Sent: Tuesday, December 29, 1998 8:16 AM To: seaint(--nospam--at)seaint.org Subject: Welding Anchor Bolts We have encountered a field condition with misplaced anchor bolts, whereby in some instances we are getting only a couple of threads engagement between the bolt and the nut. These are 11/4 inch ASTM A307 anchor bolts. The question is, would it be acceptable to plug weld the nut to the bolt? If so, are there any special welding procedures to be specified? Thanks for any advice.
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