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RE: HSS column splice

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It may be able to fit, but it would depend on how the tollerances worked out. You could always heat the outer HSS.

But if it just for the splice, consider a full pen weld. You can take a backer bar and tack it to one HSS and slide the other HSS over the backer. The backer bar thickness should be in compliance with AWS. Backing is also permitted per AWS to be provided with a root pass using a LH rod, but I would want a more skilled welder for this.

There are any number of CJP welds that can be made from one side only using a backer bar. Just show the CJP. Any detailer or shop worth their salt can figure out which is the best CJP to use and what the appropriate backer bar should be. CJP weld selection is a function of process, economics, base metal thickness, prep., shielding, etc.

Check out the B-U4a in your trusty AISC handbook for an example.

Harold Sprague

From: "Joe Grill" <jgrill(--nospam--at)>
Reply-To: <seaint(--nospam--at)>
To: "'seaint'" <seaint(--nospam--at)>
Subject: HSS column splice
Date: Wed, 7 Jun 2006 15:05:53 -0700

I'm doing a column splice detail.  I'm told that lengths over 20' in a 5x5
tube steel aren't available around here.  The splice will be just above a
floor diaphragm, and I will be able to block the column into the floor
framing pretty well.  I'm considering using a sleeve from a section of HSS
that is larger than the column section.

Anyway, will an HSS 5x5 fit inside an HSS 5.5x5.5x1/4 sleeve?  Has anybody
else out there done this?


Joseph R. Grill, P.E. (Structural)

Shephard - Wesnitzer, Inc.

Civil Engineering and Surveying


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