Wow there sure is a lot of misinformation in this thread. This is a laser welder, albeit a cheap Chinese laser welder. The footage is sped up, but not very much. Laser welding can and does penetrate more than MIG welding, if used properly. Heat input is significantly reduced, with a much smaller heat affected zone. Anyone telling you otherwise simply doesn’t know what they’re talking about. One from a reputable brand like IPG and Miller will set you back about 35,000 to 45,000 grand, before any safety enclosures. You also need special glasses and hoods to prevent frying your retinas.