TUBE MITER WELDS 1

[Lucca]

Hi all,
From your experience, which weld symbol applies better to a miter steel connection of rectangular tubes?
HSS8x2x1/4 frame, AWS D1.1 prequalified welds CJP.

 

[dvd]

Is the miter for architectural appearance? You might end up with a stronger weldment, and save prep time, if you butt square ends and groove weld, then cap open tube end, or cope. This publication on welding in HSS corners from Steel Tube Institute has some discussion.

 

[human909]

For an even stronger connection without the need for troublesome fillet welds filling in radii, try a plate mite. Again, it doesn't meet architectual requirements but it is cheap and effective.

 

[Lucca]

Thank you for the responses, but it is for a structural application with an architectural finish.
The welds should be as per AWS D1.1, ideally prequalified welds CJP.

 

[SteelTubes]

Here is an FAQ from the Steel Tube Institute on mitered connections that might help:

https://steeltubeinstitute.org/faq/welding-of-mitered-l-or-knee-connections/

 

[Once20036]

I don't believe that there is a prequalified AWS CJP weld for this situation.
Prequalified CJP welds require either access to the back of the weld (for backgouging)or a CONTINUOUS backing bar. A continuous backing bar is hard enough for a straight splice. Once you introduce the 90 degree corner I don't think it will be practical.

I usually use a PJP, with an effective throat equal to the wall thickness less 1/8". Increase the wall thickness if you can't deal with that 1/8" loss on your original material spec.