I only weld onto existing metal brackets set in concrete from the previous fencing installed ..worked great last time.There’s ppl in this world who shouldn’t own or even be allowed to possess a welder.Man these you tubers are great with the grinder! Seriously though they all make it look easy and it’s not as easy as it looks. Ok will wait to hear from all the professional grinder dudes telling me I’m wrong.Never seen anybody use a nail as a centerpunch! Real professionals you got there, buddy