Welder's special operation certificate
Welder's special operation certificate (also known as welder's work permit) is issued by the safety supervision bureau, with IC card style, three-year review and six-year renewal, which is a necessary certificate for every welder.
Welder grade qualification certificate
The welder qualification certificate that has been suspended in some areas now has a high gold content.
Welding certificate of pressure vessel
Welding certificate of pressure vessel, commonly known as green book, is needed for welding pipeline and high pressure welding.
The difference between the three certificates
The above are three kinds of certificates commonly used by welders, the first one is necessary, the second one and the third one are technical standards.
Textual research suggestion
Welders, have you all passed the exam?