Method for quickly identifying and evaluating welding defects of pressure pipeline

Abstract

The invention discloses a method for rapidly identifying and evaluating welding defects of a pressure pipeline, which organically combines an ultrasonic phased array technology and a three-dimensional visual imaging technology, performs defect scanning on a welding part of the pressure pipeline by adopting an ultrasonic phased array method, and obtains defect three-dimensional shape data on the basis of the defect three-dimensional shape data. Based on a representative unit method of a defect-containing material, defect influence is directly introduced into a pressure pipeline mechanical model, a three-dimensional finite element model of a defect-containing structure is established, and the influence of the defect on the service performance of the pressure pipeline is analyzed and predicted through a finite element analysis method. According to the method, the industrial standard and professional analysis knowledge are automatically combined to perform'in-use 'safety evaluation on the pipeline with the defects, and an evaluation report is automatically formed, so that the reliability and identifiability of a detection result are improved, a detector can perform all-directional observation on a three-dimensional displayed model, and the detection efficiency and accuracy are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of welding quality detection, and particularly relates to a detection technology of pipeline welding quality. Background technique [0002] As a kind of equipment for continuously transporting fluid medium, pressure pipelines are widely used in petrochemical, electric power, environmental protection and other industries production and public works systems, such as oil refining plants, chemical plants, power plant boilers, etc., and play an important role in national economic construction. Most of these pipelines transport flammable, explosive, high temperature, toxic and corrosive gaseous or liquid media with a certain pressure. Once explosion or leakage occurs, it will often lead to catastrophic accidents such as fire and poisoning, resulting in serious loss of life and property. Therefore, the safety of pressure pipelines has been highly concerned by researchers at home and abroad. [0003] Most of the pr...

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Problems solved by technology

[0007] However, most of the above-mentioned applicability evaluation technologies at home and abroad are based on standards and norms to give a certain range of evaluation methods, and each standard and norm has certain limitations.

These standards and specifications involve comprehensive theoretical knowledge and empirical knowledge in materials, mechanics, failure analysis, etc. The evaluation process is relatively complicated, and it is difficult for ordinary engineers and technicians to master

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