Mitered Tube Steel- Small Heel Angle Weld
Mitered Tube Steel- Small Heel Angle Weld
(OP)
I have a mitered tube steel connection with a small angle between the chord and the branch, 16 degrees. AWS D1.1 Figure 3.5 (AISC 13th edition manual Table 8-2) limits you to a 30degree mininum heel angle (upsilon). The chord is a 10 inch tube and the branch is a 6 inch tube.
Does anyone know of a pre-qualified joint that would allow such a small angle? If there's not a pre-qualified joint, is it possible, and if so how what would the fabricator need to do to ensure compliance with D1.1? Would the fabricator need to use a certain process?
I think there's joints like this fairly often in tube steel car space frames, but those are much smaller diameter tubes.
Thanks for any advice you can give.
Does anyone know of a pre-qualified joint that would allow such a small angle? If there's not a pre-qualified joint, is it possible, and if so how what would the fabricator need to do to ensure compliance with D1.1? Would the fabricator need to use a certain process?
I think there's joints like this fairly often in tube steel car space frames, but those are much smaller diameter tubes.
Thanks for any advice you can give.





RE: Mitered Tube Steel- Small Heel Angle Weld
We didn't work to AWS or any other standard except "weld the sh!t out of it".
The only slightly unusual part of the process for that part would be to extend the tungsten as necessary to reach the weld area on the acute angle part of the joint.
Sorry that doesn't answer your actual question.
Mike Halloran
Pembroke Pines, FL, USA
RE: Mitered Tube Steel- Small Heel Angle Weld
Are you back purging?
RE: Mitered Tube Steel- Small Heel Angle Weld
I was thinking more of a fillet than a PJP or CJP weld, although if PJP or CJP are all that would work with this geometry, that would be OK.
RE: Mitered Tube Steel- Small Heel Angle Weld
Back purging is the practice of preventing the back side of a weld from oxidizing. Usually by adding an inert gas to the inside of the tubes you are trying to weld together.
B.E.
The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor
RE: Mitered Tube Steel- Small Heel Angle Weld
The obtuse side of the miter joint will actually behave like a butt weld under stress - and actually look much more like a butt weld joint than a fillet - again, regardless of what is on the drawing.
Calculate your weld bead as if they were fillets, weld them in the shop so the weld is never smaller than the pipe walls being welded as if they were butt welds. Keep the joint clean with a typical 37 degree taper through the pipe wall and a 1/16 flat.
This is why pre-fabbed fittings for Y's and Tee's and weld-o-lets were invented.
RE: Mitered Tube Steel- Small Heel Angle Weld
B.E.
The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor
RE: Mitered Tube Steel- Small Heel Angle Weld
RE: Mitered Tube Steel- Small Heel Angle Weld