Welding up free T-slot extrusion instead of bolting together a frame?

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I used aluminium extrusion 2020 for the robot frame that I designed together with Basti Kuhz

20*20 Aluminium Extrusion T-Slot Profile Summary: Order No: HY-S6-2020, T-slot height: mm, Section size: 20 mm × 20 mm, Hole: φ5 mm, S8-50*50 Aluminium Extrusion T-Slot Profile S8-5050 profile's slot is mm; it can be easily connected with 20 series and 30 series profile,

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