Because the welder's certificate is a qualification certificate for professional and technical employment, it usually needs to pass training and examination.
(Generally, it is the training examination of the training school designated by the Safety Supervision Bureau, and the official documents are available online. )
Plus welder's certificate is the abbreviation of welder's special industry operation certificate, which can be used as one of the documents needed by workers in factories, mines, manufacturing, maintenance, construction and installation industries.
The issuing authority is the State Administration of Work Safety (hereinafter referred to as the Safety Supervision Bureau).