Different types of work have different study time, including CO2 gas shielded welding for 7 days, argon arc welding 10 days, manual arc welding (including gas cutting) 10 days, argon arc welding for 20 days, high pressure vessel welding for 20 days, and welder research for 3 days.

Extension: Welders belong to a special type of work, and the welder's operation certificate is a certificate that personnel engaged in the welding industry must hold before taking up their posts. Before taking up their posts, they need to hold certificates and abide by the fire safety operation rules. It is illegal to work as a welder without a license.