Welding Tips and Tricks

Hi, just joined. I am just a hobby welder, learning to TIG weld. So far, I've built a ZTFab Cart and a certiflat welding table.

I'm in the process of building an aluninium dining table out of some old Beech 18 flaps and some 4x3 I-Beam for the structure.

Can anyone tell me the order in which to weld two bits of beam together to minimise distortion? They will be mitered at about 90° to each other.

Thanks!

Mark.