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General Metalworking - All aspects of working with metal.
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Posted by stone on April 20, 2006, 12:42 am
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Is there any difference between 45 degree joints
or 90 degree butt joints for square tubular steel joints?
I've made several projects with smaller tubular steel
and I've always used 45 degree joints.
But now with the larger, 6 inch, square tube steel, I
am questioning weather this is any benefit.
Thanks.
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Posted by Don Bruder on April 20, 2006, 1:13 am
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> Is there any difference between 45 degree joints
> or 90 degree butt joints for square tubular steel joints?
>
> I've made several projects with smaller tubular steel
> and I've always used 45 degree joints.
>
> But now with the larger, 6 inch, square tube steel, I
> am questioning weather this is any benefit.
>
> Thanks.
>
Cosmetically? Structurally? Ease-of-joiningly? Tubing continuity?
Something else?
Cosmetically, definite advantage to the "mitered" style 45 joint.
Structurally, I'd think the 45 would be a bit stronger, but that could
easily depend on other factors, including what the final result is
supposed to be/do, and how it's going to be loaded while being/doing it.
As far as ease, for the 45, you've gotta be a bit more picky on both
cuts, and placement is finicky if you want to do a "pretty" job of it,
where the 90 just needs the lengths right and a decently square end -
slap the ends in place, square 'em up and weld.
If you want a continuous tube that could conceivably carry something
flowing through it, then the 45 is the only way you can make it happen
without *WAY* more headache than I'd care to deal with.
--
Don Bruder - dakidd@sonic.net - If your "From:" address isn't on my whitelist,
or the subject of the message doesn't contain the exact text "PopperAndShadow"
somewhere, any message sent to this address will go in the garbage without my
ever knowing it arrived. Sorry... <http://www.sonic.net/~dakidd> for more info
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Posted by Grant Erwin on April 20, 2006, 1:38 am
Please log in for more thread options stone wrote:
> Is there any difference between 45 degree joints
> or 90 degree butt joints for square tubular steel joints?
>
> I've made several projects with smaller tubular steel
> and I've always used 45 degree joints.
>
> But now with the larger, 6 inch, square tube steel, I
> am questioning weather this is any benefit.
One issue is whether you want the inside of a tubular piece exposed. If not,
then you will have to use some kind of joint that will seal it up.
In the Navy they figured the strongest joints were the ones with the most weld
on them. So figure out which has more inches of weld and it will be stronger.
If you butt a square tube against the end of another, there is a crack there
from the radius on the edge of the tubing. This presents an issue when welding
that you don't have if you use 45 degree joints.
GWE
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Posted by R. Zimmerman on April 20, 2006, 6:28 am
Please log in for more thread options There are several ways to go.
On critical structural work the better methods are to insert a plate in
the 45 degree connection with the plate protruding all the way around. You
then run a fillet on both sides of the plate.
Another is to make up a plate that is the width of the inside dimensions
of the 45 degree cut and you run a square groove weld all around.
The last macho procedure is to cut the ends square. The end length is
one thickness short and an end cap made undersize to allow an open corner
joint all around the end. The intersecting tube has small backing bars on
the two sides where there is a flare grove weld joint. You put a fillet
weld on the inside corner. The outside corner is a square groove weld tying
the end plate to the outside wall of the intersecting tube. The last two
sides allow you to put in a full penetration flare groove weld fusing into
the backing bar. This last method done properly is the most time efficient
and certainly strong enough.
Butting the two 45 degree cuts never ensures a proper weld fusion on
large tubing. If you bevel edges you are doing a troublesome vee butt joint
with an open root.
Randy
Is there any difference between 45 degree joints
or 90 degree butt joints for square tubular steel joints?
I've made several projects with smaller tubular steel
and I've always used 45 degree joints.
But now with the larger, 6 inch, square tube steel, I
am questioning weather this is any benefit.
Thanks.
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> or 90 degree butt joints for square tubular steel joints?
>
> I've made several projects with smaller tubular steel
> and I've always used 45 degree joints.
>
> But now with the larger, 6 inch, square tube steel, I
> am questioning weather this is any benefit.
>
> Thanks.
>