87213 wrote :
That depends on your skill. Everyone told me that the slotted
Dexion square tube was too thin to arc weld, but they were
wrong, if you know what you are doing it arc welds fine;

I have numerous items made from arc welded Dexion, that thickness is
easy. I have welded car chassis members too, but I would never attempt
bodywork panels with an arc welder, it is far to thin.