I don't know what he did this with but I've used a laser welder with excellent results. I lost the availability of it a few years ago and have another Colt SAA 1st gen project to do.
A jeweler friend has a micro tig welder that's actually made for welding dental bridges, that he wanted to sell me so I tried it out and it does work to a point but the arc is not predictable enough for the fine work and pit filling I want to do so I gave it back. That arc is just too inconsistent for me.
That laser welder was accurate as all get out and made the same size puddle every time, which by the way is adjustable. They are the greatest thing since sliced bread.
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