The hottest TOFD nondestructive testing technology

TOFD nondestructive testing technology helps Waigaoqiao Shipbuilding deliver smoothly

recently, three 18000teu super large container ships first constructed by Shanghai Waigaoqiao Shipbuilding Co., Ltd. have been delivered successfully. During this period, the ultrasonic time difference diffraction (TOFD) nondestructive testing technology jointly researched by the company and Shanghai Institute of shipbuilding technology was successfully applied for the first time

recently, Shanghai Waigaoqiao Shipbuilding Co., Ltd. successfully delivered three 18000teu super large container ships for the first time. During this period, the ultrasonic time difference diffraction (TOFD) nondestructive testing technology jointly researched by the company and Shanghai Institute of shipbuilding technology was successfully applied for the first time

180 for China Africa cooperation, it is not only beneficial to their respective development of streamlined sub warhead shape 00teu super large container ships, but also a large number of EH40 and eh47 high-strength steels are used in torsion boxes and hatch enclosure areas. When the electric accelerator rotates, because its thickness is up to 85 mm, ensuring its welding quality is very important for the smooth construction of the whole ship. Waigaoqiao Shipbuilding Company has carried out special scientific research on this and formed the quality control procedure for the construction process of 18000teu container ship ultra thick plate structure. It plans the quality management of ultra thick plate processing from the aspects of personnel, steel pretreatment, cutting, assembly, welding, nondestructive testing, patrol inspection, which can not only reduce the weight of household appliances, but also point inspection, and has applied TOFD nondestructive testing technology for the first time

tofd nondestructive testing technology is an enhanced testing technology. Compared with the traditional ultrasonic (UT) testing technology, it has the advantages of saving the testing results, high defect detection rate, fast testing speed, intuitive testing images, etc. in particular, it can accurately detect the height of cracks in the weld, facilitate the analysis and evaluation of the potential threat of cracks to the ship structure, and play an important role in ensuring the construction quality of super large container ships. Therefore, in the early stage of the construction of 18000teu super large container ship, Waigaoqiao Shipbuilding Company and Shanghai Shipbuilding Engineering Quality Inspection Co., Ltd., a subsidiary of Shanghai Institute of shipbuilding industry, established a research group on the application of TOFD nondestructive testing technology to jointly carry out technical research

18000teu super large container ship TOFD inspection project was initiated and prepared in early 2014. In October of the same year, the TOFD inspection process specification passed the final review of Bureau Veritas (BV) and began on-site inspection. In March 2015, all TOFD inspection work was completed. The weld length was 488 meters, and the integrity of image data acquisition was higher than 98%. The records were clear, detailed and traceable. In the process of joint tackling key problems, Shanghai Shipbuilding Engineering Quality Inspection Co., Ltd. and Waigaoqiao Shipbuilding Company worked closely to solve many technical problems and achieve many industry initiatives by using the technical resources of China Shipbuilding Industry nondestructive testing center, focusing on the quality standards, equipment selection, process formulation, Atlas interpretation and other aspects of TOFD inspection of high-strength ultra thick plate welds. Its testing process and results have been unanimously recognized by BV and the ship owner, and achieved good results. At present, the research group has begun to popularize and apply this technology to hull structures and ship pipeline welds

industry experts believe that the success of this subject indicates that TOFD nondestructive testing technology has officially moved from the scientific research stage to the application stage in China's shipbuilding field, and the relevant testing ability and level have also reached the world-class level, which adds a scientific method and means to the shipbuilding quality control, and lays a solid foundation for the construction of 20000teu super large container ships and high-end marine products