I would like to connect 2 aluminium extrusions at the right angle end to end. What is the best way to have nice square joint, stiff and easy do?
I am thinking about something like on the picture below (using 4 bolts per corner), but I am worried that as a tight the bolts the profile will deform and that connection will not be stiff enough. Putting tubular spaces inside the profile sounds like a bit too much hassle. Is the triangular corner bracket really the only choice? Would 4 bolts link on each corner be enough to hold my y assembly together?