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RE: welding HSS to HSS

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If I understand correctly, the HSS will butt together at an angle.  For straight butt joints, I have seen fabricators profile cut a plate to fit within the tubes at the joint to make a backer bar.  But this won't work at an angled butt joint without a lot of fit up grinding.  In your case, I would think it easiest to put a plate at the seam and fillet weld both tubes to the plate.  Will a plate extending beyond the surface of the tube be acceptable?


Bob Garner, S.E.


From: Truitt Vance [mailto:Truitt(--nospam--at)]
Sent: Wednesday, August 23, 2006 10:49 AM
To: seaint(--nospam--at)
Subject: welding HSS to HSS


I am considering using a tube steel section to create a “bent” for a hip roof that I can’t tie horizontally.  The roof is a 20’ x 16’ hip roof with heavy tile loads and someone thought it would be nice to have a 5’ square skylight centered in middle.  I would put two of these frames on either side of the skylight in the short direction and then bear the wood framing on them.  I am trying to use a 7” section, so I think a tube might work the best. 


My question is regarding the welded connections, since you can’t access both sides, how is the best way to weld the butt ends of a tube steel section together?   I can use tabs if I have to, but I have had this question with similar situations, so I thought I would ask.


Truitt Vance

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