"Triangulating" after fabricating, before welding
This is an example of using stiffening struts tack-welded on to create a triangular load path resisting weld deformation.
Rotational freedom at the corners does not enable to triangle to change shape.
Any triangular path which has not broken is very stiff, compared to any other shape.
Hence we "triangulate" for stiffness.
Even with small easily severed tack-welds holding the struts in-place, the stiffening effect is immense.
Removed and remnants of strut attachment welds ground to flush with sections, the accurate neatness of the end product gives no hint of the rough improvisation which produced that result.
(R. Smith, 16Mar2021)