According to the investigation, the welder's certificate belongs to a special industry and requires an official examination to obtain it. The application fee of Safety Supervision Bureau is about 500 yuan. According to Article 42 of the Management Regulations on Safety Technology Training and Assessment of Special Operators, the charging standards for training and assessment of special operators shall be uniformly formulated by the safety production supervision and management departments of the people's governments of provinces, autonomous regions and municipalities directly under the Central Government in conjunction with the departments responsible for the assessment and certification of special operators in coal mines or designated institutions, and shall be implemented after being approved by the price and finance departments of the people's governments at the same level. The certification fee shall be included in the financial budget of the same level by the examination and certification authority.