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Re: Cutting L-angle and feel stupid lol
Posted: Sun Mar 12, 2017 7:21 pm
by cj737
Coping Angle bar adds a length for welds over a typical miter cut. It will be stronger. But you still need to learn to miter opposite ends properly
Re: Cutting L-angle and feel stupid lol
Posted: Sun Mar 12, 2017 9:09 pm
by homeboy
Re: Cutting L-angle and feel stupid lol
Posted: Sun Mar 12, 2017 10:51 pm
by Otto Nobedder
The strength advantage, if any, comes from the changing angle of the weld versus the load line. Whether coping provides any real advantage has much to do with how the joint will be loaded. In a simple miter, the weld and it's HAZ are in a straight line across all the material, so any weakness induced by the heat effect on the metal also occurs in that straight line. Disrupting the lines by coping changes this effect.
Steve S
Re: Cutting L-angle and feel stupid lol
Posted: Mon Mar 13, 2017 8:23 am
by homeboy
Re: Cutting L-angle and feel stupid lol
Posted: Mon Mar 13, 2017 6:31 pm
by Otto Nobedder
Quite right. Avoiding perpendicular lines (relative to stress) and sharp corners (your squircles) and anything that comes to a sharp point (nipped gussets) help distribute stresses more favorably. I need to have that discussion at work again, since we've been repairing and reinforcing a lot of underbuilt semi-trailer frames recently.
Steve S
Re: Cutting L-angle and feel stupid lol
Posted: Mon Mar 13, 2017 7:09 pm
by Poland308
I've found it to be good practice to round the corners of a gusset so that the radius of the corner is equal to or greater than the thickness of the patch material. No sound reasoning just my personal rule.
Re: Cutting L-angle and feel stupid lol
Posted: Fri Apr 21, 2017 11:08 pm
by JEKS
Another strength trick for corners with angle iron is to
Drill inside the flange exactly where the corner would be
On the plane which is not changing.
Next, notch up to the drill Hole but don't cut through.
Then, bend the angle into the plane which will have the
Angle.
Last, weld where the notches come together.
You end up welding half as much and have a work hardened corner
Joint on the bent angle.
Re: Cutting L-angle and feel stupid lol
Posted: Tue May 09, 2017 11:44 am
by DrDogwood
I do a lot of angle Iron frames I keep several different size pieces of square tube cut about 8 inches long under my Chop Saw whenever I cut angle either way flat on top or bottom I place the square tube in the angle clear of the cut to support it so all I have to do is roll the angle 180 deg to cut the other angle. And get a framers square to set your 45deg angle its more accurate than the scale on your saw.