I am learning stick welding and yet to learn how to make smooth welds without crevices.
But I already have quite a few now and wonder what to do with them. I tried to remove the slag inside them with a wire brush and drill bits, but there is always some slag left which seemingly prevents filling them with additional welds: molten steel does not seem to be eager to go in and seal them:
Currently I have no better idea other than using drill bits to drill the slag out of them one by one, inevitably removing some steel, and trying to weld over again (and, perhaps, again).
Are there some better ideas/techniques?
If I knew for sure that I could just leave them I would happily do so (absolutely no desire to be drowned in perfectionism). But this piece is supposed to be coated with zinc paint (like this one), then with some epoxy primer and be buried in damp clay soil where I hope it will not rot for a few decades at least. These crevicies seem to possibly compromise the quality of coating and I think they could result into defects/holidays which will allow water in and thus ruin the effort. Or maybe not?
(Hot dip galvanising would have been ideal of course but it is not available in my area)