These folks are using a LASER welder. It's awesome and is in many
retail stores and factories.
Here's one site
Uses no heat. Every shop needs one if you do a LOT of work, about
$26,000, $600 a month to lease. My price book has laser welding in
There's a store in Ft Worth Texas that charges $90 to size a ring
smaller with a torch and $120 with a LASER.
70% of all sizings are done with a laser.