Aluminum sheet - can take crisp 90deg bend, weldable, crack resistent, rigid?

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Are these too far opposing properties for aluminum? - Bendable to a crisp 90deg- Good weldability- Crack resistent- Rigid/strong, not flimsy/flexibleWhat I am wanting to do is bend sheet in to sealed boxes. I am wanting to minimize the seams and weld the seams shut. The boxes will have to keep water 100% out (rain, not submerged) and I am hoping to achieve that with welds as opposed to, say, laying angles in the corners and spot welding the sheet to the angles then sealing the parts with some kind of sealant/adhesive. I looked at .063" 6061-T6 AMS4027. From a thickness, rigidity, stiffness standpoint the stuff would be perfect. However, it can't take a crisp 90deg bend... Is there a grade of aluminum that will suit?
Reply:Minimum bend radius for 6061 T6, .063 is 1/8" according to Industrial Metal Supply pdf online. I am not sure what you mean by a 'crisp bend' but that bend radius should be good for 90 degrees. If you are getting cracks a simple solution is to increase the radius.Miller Multimatic 220ACMiller Thunderbolt 225Victor OA
Reply:Usually bend radius is specified as some multiple of the sheet thickness (1x or 1.5x times thickness).  Looks like you can get tighter bends with untempered 6061 (6061-0), but you give up 1/2 tensile strength.https://www.americanmachinetools.com/bend_radius.htm
Reply:5052 is used a lot in marine applications.  I used it for hand formed gas tanks in 0.062 inch thick.  It will take a sharp bend and is easy to weld.  The 6061 T6 temper might make it not so easy to bend sharp, T4 would be easier to get a crisper bend but I don't know how available it is in sheet.