There are differences between spot welds, tig, mig, arc welding and brazing or silver soldering. I have done all of them except spot welding. In many of those procedures you're adding metal, but not spot welding. And brazing or welding quality bicycles is an art form, or a artisan craft at least. Even a good plumber has to have some skill soldering copper pipe and knowing about galvanic corrosion with dissimilar materials like galvanized iron and copper. Including clean joints and proper fluxes.
I have seen many spot welds fail. Demeyere spot welds their Atlantis straight sided pans. I can see the (4) spot welds. I have to trust that those Belgians know what they are doing. But already here, someone has provided an example of a failure. They (Demeyere) may braze their cladded handles, I don't know, but it seems possible. I've not taken notice. You'll notice that Fizzler uses many spot welds on their handles, a safer bet if less elegant.
