Hi there. I'm new to metal working and the forum. I'm trying to figure out how to attach an aluminum panel to some aluminum tubes. I have a rectangle made out of 3/4" aluminum tubing and the two long sides have a flange on the inside. The aluminum panel sits inside of the rectangle on the flange (See pictures). I'm not sure how to best attach the aluminum to the flange. I would also prefer to have the aluminum panel sit flush with the top of the tubing as I will be resting something on both the tubing and the panel on one side. The space is 2.8 mm. Appreciate the help!
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