looks like its been mig'd to me
oh mig, that is tig wire though! was using it to gauge the curve, i can do better welds just wasnt to be that day lol, thats pure argon too and located by a drafty open entrance i tig welded the other door,jesus it was crap, had to use 316 stainless filler to stop the porosity as I couldnt clean both sides of the weld
i lost motivation for welding rotten cars years ago but i will say i made quite a bit from the MK4 escort they were rot boxes especially around the year 1987
the battery trays were always the first to go and you would get the leaking fuse box