Where can I get the welding certificate of Xunxian air-conditioning copper pipe?

The welder certificate shall be handled by the local quality supervision department. The welder's certificate belongs to the special operation certificate, that is, the work certificate. A special operation certificate is a certificate that shows that a worker is qualified to engage in a certain occupation. Special operations personnel must undergo special safety technical training and pass the examination, and can only work at their posts after obtaining the People's Republic of China (PRC) Special Operations Operation Certificate.