[doneinone]

For practice I have been welding 2 inch .035 6061 round tubing with ninety degree miter butt welds. I have had surprisingly good luck but was wondering if there were a preferred method to weld the outside corner portion of the joint. Also I noticed very little info on this type of weld when I googled it. How is it structurally? Thanks

[jwright650]

My guess...if welded correctly, IMHO, the outside corner would be the strongest part of the joint as it would be mostlikely a full penetration weld if it melted all the way to the inside....regardless it is a groove weld vs a fillet weld if I'm picturing your joint correctly.

[doneinone]

Miter Joint.jpg (3.75 KiB) Viewed 1059 times

Thanks for your input. The attached image is what I was talking about. On my welds the bead protrudes on the outside corner and that is why I was wondering if there were a particular method for this weld. In this image the outside weld looks flush with the outside edges of the tubing, much better looking than mine.

[jcw]

Perfect fit up. Likely a fusion weld with little to no filler added. Correct amps and penetration.

I remember Jody has a nice video about outside corner welds on some thin material.

[Rick_H]

Structural strength on that joint depends on where the load is coming from. With Alum you always will use a little filler, with that thin full penetration is easily achieved.

[jwright650]

Miter Joint.jpg

The attached image is what I was talking about.

Nice welded joint in that pic. After I posted, I thought about it more and I see what you mean...but like stated already with that thickness it should not be a problem.