Order of welding for highest chance of success

Hi all,

I'm after some advice as to the best way to achieve the best results welding up the part shown in the attached picture.

- The blue is mild steel rectangular section 40mm x 20mm x 2mm
- The green is mild steel plate 6mm thick

Would it be advisable to weld all the box section together in a rectangle first and then weld the plate on top?

Or better to weld each box section onto the plate, one by one?

I'm going to flatten it on a mill afterwards so doesn't have to be granite flat but the flatter the better really.

Cheers,
Marc



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