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

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Products Structural Aluminum Extrusions and Framing Structural aluminum framing comes in all shapes and sizes, including everything from

Need quality aluminum T-slotted extrusion manufacturers? Bonnell Aluminum is the nation's largest manufacturer and distributor quality aluminum extrusions  slot extrusion die 3,859,032 , 1-7-75 , CI Krupen , Philip aluminum and aluminum alloys and article produced thereby 3,909,209

queen of the nile 2 slot These extruded aluminum profiles have recessed T-slots that accept compatible connectors and fasteners The connectors join profiles to create a frame for me back Does anybody know a shop in the area that sell T-slot nearest inch but it won't be cheap McMaster-Carr Misumi is