Ultrasonic testing process of marine steel-welding joint phased array

Abstract

The invention relates to an ultrasonic detecting process of a marine steel-welding joint phased array, which is characterized by comprising the following steps of: a, preparing detecting equipment; b, removing splashes, rust and oil dirt on the surface of a detected object and in a probe moving zone and smearing coupling agents on the surface of the detected object and the probe moving zone; c, selecting a reflecting angle and a transmitting depth for scanning; d, inputting data or scanned images after scanning; e, analyzing scanned zones according to the detecting data or the scanned images; and f, evaluating the quality of welding joints. The invention can carry out no-damage welding joint detection and achieve the purpose of higher speed, precision, resolution and reliability than those of the prior art and fills the blank of the research application of a phased array technique in national marine industry; besides, the invention can be directly applied to the quality detection of submarine shells and aircraft engines for missiles, makes up the shortages of the traditional ultrasonic detection or forms the effective complementation with other detecting techniques and can ensure that the quality detecting process of a product tends to be more perfect, thereby enhancing the reliability of the product detecting technique.

Description

Technical field: [0001] The invention relates to the technical field of ships and pressure vessel pipelines, in particular to a phased array ultrasonic detection process for ship steel welds. technical background: [0002] Phased array ultrasonic detection technology has been widely used in developed countries such as Europe and the United States. For example, Canada and France mostly use this technology in the manufacturing inspection and in-service inspection of hydropower and nuclear power equipment, and it has a tendency to gradually replace ray detection, which greatly reduces the detection cost. cost and production cycle. At present, phased array ultrasonic detection technology is still in its infancy in China. Although some equipment has been imported from abroad in recent years, its application is still quite simple. The detection of parts with complex shapes or special materials has not been widely used, and the excellent detection ability of phased array ultrasoni...

AI Technical Summary

Problems solved by technology

Such as ray detection, the defect detection rate is often affected by factors such as plate thickness, focus size, defect position and orientation, and it is not easy to achieve the detection effect, especially for upper defects, the geometric ambiguity on the film often exceeds the standard range ;Using conventional ultrasonic flaw detection, due to the attenuation of sound waves in the material, the signal-to-noise ratio of the defect signal is low, and it is often difficult to distinguish the defect signal from the pseudo-defect signal, and the conventional detection speed is slow and it is easy to cause missed detection and misjudgment. With the development of product technology, the requirements for product quality are getting higher and higher. The military and manufacturers have put forward the "four high" requirements of high speed, high precision, high resolution and high reliability for nondestructive testing technology.