From my aircraft building experience: Two ways to do it.
1. Cut two pieces of same tube about 3 inches. Use a suitable size round file to shape the ends to fit over the bent tube to form a triangle corner support. Leave the ends slightly longer to form tabs where you drill and rivet to the main tube. And/or you can rivet the sides for extra strength and stability. Shape and file the edges to make it fit perfectly and look pretty. This will be the most professional finish.
2. Cut two small triangle aluminum gussets to fit on each side of the bent tube, and rivet (4 rivets per gusset). File to round the edges and it will look pretty good as well.
Also note that you should not mix aluminum and steel. Dissimilar metals cause corrosion and will eventually lose strength and loosen up.
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