x T-Slot Aluminum

Welding up free T-slot extrusion instead of bolting together a frame? aluminum t slot channel This is usually manufactured from 6063-T5 Aluminium that has been anodised to provide a durable finish This system is often compared to an industrial mechano aluminum tslot EX-3875 - x Smooth T-Slotted Aluminum Channel SPECIFICATIONS: Weight = lbsft Estimated Area = in2

aluminum t slot extrusions channel and tubing? What kind of disadvantages? I do plan to mass Aluminum plate or extrusion for frame?? 626 Ball bearings & 5mm