The research direction of this project belongs to the non-destructive testing technology major under the discipline of mechanical engineering. During the research process, in view of the difficulties in the application of conventional non-destructive testing technology in ships and offshore engineering, based on the phased array ultrasound and diffraction time difference technologies developed in recent years, through analyzing the application of these two advanced non-destructive testing technologies in the shipbuilding industry. Feasibility, targeted typical advanced technology testing processes were researched and developed, including: small diameter pipe weld detection process;LPG tank weld detection process; The rapid inspection process for coated welds and the joint inspection process for medium and thick plate welds have been approved by the corresponding classification society. In the process of in-depth application, special scanning equipment suitable for advanced technology was designed and developed based on site characteristics. In the end, an advanced non-destructive testing system including process documents and scanning equipment was formed. Innovation points of this project: 1. Through computer simulation calculation, determine the technical parameters of supporting equipment such as probes, wedges, and scanners that meet the testing needs, and form a small-diameter pipe weld detection process. 2. The developed coated phased array ultrasonic rapid inspection process can detect the size of crack defects in coated steel structures, and is especially suitable for testing coated welded components in operating ships and offshore engineering. 3. In response to the technical problems of conventional non-destructive testing of thick plates after ships are large-scale, a joint testing process has been innovatively developed by combining the advantages of phased array ultrasonic testing and diffraction time difference testing technology. 4. For the inspection of medium and thick plates with different shapes and positions, a special scanner is designed and developed, and it is flexibly assembled according to the environment of the medium and thick plates being inspected, which can greatly improve the convenience of on-site inspection. 5. The special scanning equipment for small-diameter pipes developed in this project has wheeled and chain small-diameter pipe scanners to adapt to different application scenarios. Intellectual property rights and promotion and application: This project has obtained 1 invention patent, 4 utility model patents, 1 design patent, 1 software copyright, and published 5 papers. Related technologies have been widely industrially applied in different ship types. Economic benefits: Eight jack-up drilling platforms have carried out phased array ultrasonic small-diameter pipe weld testing. On average, each platform detects more than 1400 pipe orifices. The cost of each inspection is 200 yuan lower than that of ray testing, so each platform directly saves the inspection costs are close to 280,000 yuan. Two platforms are inspected and completed every year, with an economic benefit of 560,000 yuan; after adopting joint inspection, the welding quality of the 400K ore carrier has been greatly improved, and the repair cost of each vessel has been saved by 360,000 yuan. In 2017 and 2018, 4 ships will be completed each year, saving 1.44 million yuan per year. Social benefits: 1. After using green, environmentally friendly and radiation-free phased array ultrasonic testing technology to replace the original ray testing technology, the shipyard's cost investment in safety has been greatly reduced, and the personal health and environment of all shipyard staff are ensured. Safety brings incalculable social benefits. 2. The use of new technologies has led to optimization of testing efficiency and improvement of testing quality. Due to the cross-operation on site and the efficiency advantages of joint testing technology, the efficiency of testing work can be increased by more than 60%, shortening the ship's construction cycle. 3. Advanced technology is more intuitive and recordable than conventional ultrasound; the contrast ray is not affected by the crack direction, and its ability to detect defects is enhanced, which brings a huge improvement effect to quality control during the ship construction process. The technology and equipment developed in this project solve the technical difficulties of conventional nondestructive testing, the testing method is green and environmentally friendly, the testing efficiency is improved, the comprehensive competitiveness of Chinese shipbuilding enterprises, especially large ship construction enterprises in the world is improved, and contributions are made to the smooth promotion of China 2025 Plan.