I just returned and was refunded for a hand held "laser" welder.
There are many other sellers of identical devices.
They say "Laser welder"; but, they are usually hand held arc welders.
I feel that they are using deceptive item names and photos, to imply that an arc welder is a laser.
Smaller laser welders use an optical cable, for jewelry welding.
Larger gas (Argon, CO2, etc.) laser welders costing more than about $200 also use an optical cable to burn off rust, and maybe tack weld thin metal sheets.
Just search for hand held laser welders, to find the deceptions.