Joining angle iron at 90 degrees using 3 easy joint methods - cope & mitre. Welding preparation

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Cope mitre joint

[@TheMaddogronh]

I'm glad you can't hear me yelling on #2 to just cut the dam thing !!!
Thanks for the video !!

[@alexs1007]

Tired to do method #1 by myself but couldn't figure it out. Thanks to the vid now I know.

[@dimkoup1]

Εισαι ο καλυτερος.Μπραβο σου.

[@gregwilson9035]

Method 2 worked a treat for me. Easy to cut it out. Easy to weld it up and turned out nice and square. No more 45 degree mitre cuts for me!

[@TheMetalFabGuy]

@gregwilson9035
Thanks Greg
Pleased you took from the video.
All the best.

[@ronaldeisel5927]

Thanks! #2 and #3 look less problematic for sure.

[@Laura-wc5xt]

ANOTHER WINNING FABRICATION VIDEO .......Thank you T M F G.......

[@tomchristopher4576]

Great stuff. I always cope, never 45. Thanks for an awesome video!

[@TheMetalFabGuy]

Thanks for watching Tom. 👍

[@SterlingPowell]

I’m very new to this realm and love to learn of it.
Your comment sparked a question Tom. Why never a 45? Because of difficulty level or strength? Thanks!

[@dormindont1]

Полезное видео, спасибо!👍👍👍👍👍

[@josericart1354]

excelente video. Saludos

[@vat_1989]

This is awesome, thanks a million

[@TheMetalFabGuy]

Thanks for watching 👍

[@tegbahadur1739]

❤ very good

[@diazjorge7085]

Better than perfect, exelent coping samples

[@TheMetalFabGuy]

Thank you for watching Jorge. 👍

[@justinsinkala]

Nice work brother man

[@TheMetalFabGuy]

Thank you Justin

[@fernandorivas4230]

good work, one day i will practice that with scrap material i have waiting on me. thanks!

[@TheMetalFabGuy]

Thank you for watching Fernando 👍

[@madcapmagician6018]

nice information =)

[@TheMetalFabGuy]

Thanks for watching 👍

[@jesusmarte1880]

Nice

[@zoozolplexOne]

cool !!

[@TheMetalFabGuy]

Thanks for watching 👍

[@danburch9989]

The 45 is more pleasing to the eye for exposed joints but has 80% of the strength that the inside & outside coping joints have due to a shorter weld bead. Weld beads are usually stonger than the parent metal.

[@robertsonplantwalls]

this. people forget the metal used for welding is very pure and has incredible strength. More weld is a better for strength.

[@stevev6384]

I do 45 cuts way differently. Coping is what I do when I’m joining regular mill scale covered angle iron. . But when I want it to look nice like if I’m tiging some stainless for a frame. I always go with 45

[@TheMetalFabGuy]

Thanks for your comments and watching Steve. 👍

[@Laura-wc5xt]

Dear Metal Fab Guy: how do you keep you fingers and hands so clean?.....I always look like I just changed an engine and transmission in a WWII German Tiger Tank!!!! While at the Russian front in the Mud and Blood of the Spring Offensive......Cheers, Paul

[@TheMetalFabGuy]

😄😄
As you say…Hard to keep anything
Clean in this game. I normally film the videos at the beginning of the day, which I guess accounts for the clean 🤚.
Cheers Paul.

[@daltonhamblin350]

So satisfying watching your videos. How long you been fabricating?

[@TheMetalFabGuy]

Hi Dalton.
Thank you for watching.
25+years metal bashing

[@Laura-wc5xt]

@@TheMetalFabGuy UK or Australia? Canada?

[@CamiloSantana]

ahhh! beginner hobbyist here building a shelf that wishes he saw this a few days ago. trying to do 45s with a chop saw I've learned is a crap shoot.
I don't have a band saw. angle grinder doing either of the copes would've been better.
I'll do better next time. thanks to you

[@TheMetalFabGuy]

And Thanks to you for watching Camilo.
Instead of the Cope or mitres anther option would have been a square cut but to have sat the angle inside each other, like you see commonly on a gallows bracket.
Plenty of options...
Good luck with your project .

[@CamiloSantana]

@@TheMetalFabGuy I thought of that initially but mitre looks pretty and it's for a girlfriend's garage.
getting it done? I can do that. add some finesse? uhhhh

[@bobt5002]

Is any one of them structurally stronger than the other one? Which one is your preferred method if not specified by the drawing?

[@TheMetalFabGuy]

Thanks for watching Bob. Unsure with regard to the structural strength but would imagine all 3 would be more than adequate in the smaller range of material ie 2”’as per video.
Personally I Would usually go for mitred option on framework.
Though both methods 2&3 allow for simple square cuts on 2 sides of a frame opposed to a mitred joint being required on every end.
Method 3 as the video briefly shows, can also be used as an option for a mid bar on a frame.
(Where I slid it into position)

[@bobt5002]

@@TheMetalFabGuy thanks so much for your explanation.

[@TheMetalFabGuy]

With consideration, I’d suggest that the mitred joint is the weaker of the 3. More joint to weld with the other 2 and the mitred joint has only the one axis of weld. But only my suggestion and I’m sure there’s a calculation out there somewhere to prove that.

[@versatileduplicity9313]

The first one

[@suhendralee88]

#3❤

[@stormlitsayala1572]

Thank you

[@TheMetalFabGuy]

Thank you .

[@josebernardo9904]

Que giz é esse que tu usa?

[@Schrodj1]

I could use some help. Even with a square guide I'm never getting perfect 90 squares using 45 cuts on aluminum... I figure it can't be heat, but I'm losing my mind trying (and failing) to get square corners here. Any advice? Are 45s too hard for the layman fabricator?

[@TheMetalFabGuy]

Once you’ve welded the 45°s or before ?
Sounds silly but make sure your square is actually square to begin with.

[@IzarySulz]

Hi, what machine are you using to cut the steel?

[@TheMetalFabGuy]

Bandsaw for the cut to size. Angle grinder to notch.

[@ericramirez971]

Yes

[@user-py1hz9ik2i]

Saved humanity from not knowing how to use hands and toilet paper

[@ADILKHAN-gh4xg]

👍🏻

[@TheMetalFabGuy]

Thanks for watching 👍

[@louiesarabia8850]

Pa nagdrill ng bakal sir.alin ang maganda lagyan ng tubig o hindi na?

[@paulosamuelbanze4398]

Good work

[@TheMetalFabGuy]

Cheers Paulo.
Thanks for watching

[@xXTECHxKNIGHTXx]

So say you are trying to make it out of a single piece to make a shelf, couldn't you cut two opposing 45s, then cut a relief in the steel and bend the angle to make a right angle?

[@TheMetalFabGuy]

Sure can. Good option for a 90 👍

[@AndresAlvarez-cp2he]

Yes, by far the easiest option if you have a long piece, just make sure you leave an extra mm to be filed away if necessary for a perfect fit.

[@AndresAlvarez-cp2he]

@@TheMetalFabGuy can be used for other degrees, just divide the angle you need by two and then trace each one.

[@HailMich]

Most saw machines I run cut 45 angles without the extra effort. Just type 45 and go… but honestly I’ve never saw someone cut with that little of coolant.

[@TheMetalFabGuy]

Thanks for watching Eric 👍
“Type 45”. That’s some saw you have.
Look forward to your video.
Sometimes I cut without any coolant 🤫

[@HailMich]

@@TheMetalFabGuy hydmech or hem saw are what I usually run. I do like the video. I saw a lot of steel with angles,channels,flats, and I beams that are fabricated by companies who have us saw there kits. 55-100 pcs.

[@nateb4543]

Maybe it introduces more ways to mess it up, but couldn't you cut a 90° notch out of 1 piece, on one side, then bend it to make 2 45° like the first method? Less cutting, less welding, maybe a little hammering.
For the other methods, i was thinking if instead of removing the notch, you ground it down (thickness) and the other piece and have them overlap, then weld? You'd have a buldge but it might be stronger? Idk, new to all this, just spitballin

[@techwizpc4484]

You could do that but be sure to bend well because the curve where it was bent adds a few millimeters and can easily mess up the 90 degrees. I had to resort to just using the first method in this video.

[@thisisamirhamza]

1st one is beautiful and better

[@haerulrijal]

how to smooth the inner part

[@thardyryll]

That is always difficult because an angle grinder with a flap sanding disk cannot reach all the way into a miter cut. The two coped 90s are easier to smooth. There are narrow hand-held belt sanders for close quarter sanding in tight spaces, but they are a specialized tool.

[@versatileduplicity9313]

Now part 2, I do not do !! Can’t stand cutting with grinders. Just to risky

[@joanv8190]

What thickness is the material

[@TheMetalFabGuy]

5mm

[@thyfr26]

I always do a 45 for an outside corner, only cope for the inside joint

[@TheMetalFabGuy]

Thanks for watching 👍

[@victorlima8946]

I do have easy way in round;

[@sanjaysharmagazipuri9251]

Tan{90}=8×50=16mm.

[@StrangeFredyKing]

method 2 and 3 are the same

[@TheMetalFabGuy]

Take another look Faraidun.
Thanks for watching

[@danburch9989]

I agree. They are very similar. The only difference is what side is the coped piece cut.

[@stephanjones2877]

Good video, nice techniques, but what's with the long pauses between the cuts? Had to skip through more than half of the video.

[@TheMetalFabGuy]

Thanks for watching Stephan.
Mate I’m a welder fabricator with a camera phone. But I take onboard your comments for future videos.
For the record the videos are chopped a lot more from the original cut. So I did at least save you from some skipping. 😂😂
All the best .

[@samdean5383]

I wish I could message you directly. . Life's not perfect.

[@TheMetalFabGuy]

Instagram Sammy

[@josephisaac3603]

There’s a fourth way

[@TheMetalFabGuy]

Thanks for watching Joseph.
I think there may be a couple more at least.

[@josephisaac3603]

Cope is better stronger

[@kyimg8046]

သိတဂူဆရါ‌ောာ်တရါး‌ောွ်၎င်းျါး

[@versatileduplicity9313]

45s are the best

[@DwFab]

Are you mute ?

[@TheMetalFabGuy]

What would you like to talk about @blackn5485 ?

[@rednogaru]

He is skilled