Have you considered epoxy?

I can weld decently enough, I studied it at college and my cousin is a crazily skilled welder with 25 years experience but I'm still going to use a mix of bolts and epoxy when I build my machine because I think it is a better fit for the task. 3M's DP range of epoxies are used to hold airplane wings on and by BMW/Lotus for car chassis and a well done epoxy join will outperform a poorly done weld.

DP-420 3M EPOXY overlap shear test by Doctorbass PART 1 - YouTube