Pressure Vessel Welding Management System

Thread Content

Welding Management System 1 Welding Procedure Qualification Management: The company’s controls regarding welding procedure qualification are implemented by its dedicated weld inspection company. Welding technicians on the project submit requests based on the welding requirements of the project (specifications, materials). The weld inspection company then prepares a list of welding procedure qualifications approved by the company’s chief engineer, which serves as a basis and guiding document for preparing welding procedure cards for the project’s welding work. 2 Management of Welders 2.1 All personnel involved in welding work for this project must hold valid certificates to be allowed to work (including welders, non-destructive testing personnel, and heat treatment personnel). 2.2 All high-pressure qualified welders, medium-low pressure welders, and ordinary welders who are involved in welding work for this project must undergo verification and registration; they must pass the welding competency assessment before they can engage in welding tasks. 2.3 Assessment methods for welders before taking up their posts. 2.3.1 Conduct qualification tests for welders who are responsible for welding the heating surfaces of boilers and pressure-bearing pipes; 2.3.2 Requirements for welders: Welders carrying out welding work must possess a welder’s certificate issued by the Ministry of Labor for the relevant type of welding; 2.3.3 Welders must pass examinations as required, as well as radiographic non-destructive testing, before their eligibility to work is approved; 2.3.4 Welding procedure specifications: The welding materials to be used are carbon steel 20# and alloy steel 12Cr1MoV ； Welding processes used for assessment: GTAW+SMAWT and GTAW ； Inspection position: 45° oblique welding (6G) ； 2.3.5 Acceptance criteria for the appearance of welded joints: Cracks, lack of fusion, incomplete penetration at the root, surface pores, and slag inclusions are not permitted ； The root penetration depth shall not exceed 0.5 mm. The total length on both sides of the weld shall not be more than 10% of the total weld length, nor more than 40 mm; the root bulge shall not exceed 2 mm; the indentation shall be less than 1.5 mm. For pipes with a diameter of less than 100 mm, the angular deformation of the weld shall not exceed 1/100; for pipes with a diameter greater than 100 mm, the angular deformation of the weld shall not exceed 3/200. 2.3.6 Acceptance criteria for radiographic non-destructive testing of welds: Non-destructive testing may be carried out only after the visual inspection meets the requirements; it must satisfy