That's actually flux core not stick Like MIG only without a gas bottle-- there's flux down the middle of the wire. Cheap and cheerful and works quite well on anything between 2mm and 3/32" thick. I think he's shutting his eyes and then buzzing tacks on. Not recommended for framebuilding, although it looks like he's just attaching a washer for a kickstand or something? And that Dutch boneshaker probably is about 2mm thick.