Some questions about NDT? Methods of non destructive testing

Non-destructive testing is a downstream job of welding, and both specialties are broad. If you have the opportunity to take the exam, you should take the exam first. The non-destructive testing certificate of special equipment is used in Shandong and is used throughout the country.

Non-destructive testing generally needs to be done on site, while welding technicians generally do not go to the site to weld. I think both majors are good. I have been working in non-destructive testing for more than 20 years, and I think it is good.

Welding and non-destructive testing are related to each other and independent of each other, and practitioners engaged in non-destructive testing and welding work need to hold a qualification certificate issued by the relevant departments. In general, the qualifications obtained in different regions can be used throughout the country and within the scope covered by the certificate. At present, there are mainly machinery industry, power industry, hydropower industry, shipbuilding industry, aviation industry and other associations issued by the corresponding qualification certificates, special industry qualification certificates issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China and relevant departments in various regions.

Do you know what a non-destructive testing method is?

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Radiographic inspection technology solutions.

1. On-site acceptance procedures for radiographic testing equipment and raw materials.

1) The manufacturer and brand of equipment and materials used in non-destructive testing must be approved by the owner and the supervising engineer.

2) After the materials and equipment arrive at the scene, a special person should be responsible for receiving and accepting the goods. Review whether the material certificate, material certificate and manual are complete, and conduct visual inspection, spot check, test and identification mark of materials and equipment according to the packing list, and make inspection and acceptance records.

3) The materials and equipment arrive at the site and pass the inspection and acceptance, and then approved by the owner or supervisor before they can be used.

4) Unqualified materials and equipment should be resolutely returned, and qualified materials and equipment should be stored in the warehouse according to the regulations.

5) The person in charge of equipment and materials is responsible for the handling and transportation of materials and equipment. And do a good job in the transportation, handling, storage, protection and management of materials and equipment. The person in charge of technical quality shall supervise and inspect the implementation of this process control.

The handling and transportation of materials and equipment should be handled with care to prevent violent bumps, and to avoid the failure of instruments and equipment due to collisions during handling, so as to prevent the occurrence of creases in the film and leakage of powder.

6) The management of materials and equipment should set up a special warehouse. The warehouse is equipped with thermometers, hygrometers, fire extinguishing appliances, etc., and the warehouse is kept ventilated and dry. The materials in the warehouse should be placed neatly, and the status should be marked as required.

Keep out of direct sunlight. Materials and equipment should be kept by special personnel and special posts to ensure that they are properly stored from storage to distribution, and to prevent damage, moisture, corrosion and loss of materials and equipment caused by improper storage.

7) The storage and distribution of materials should be carefully checked and recorded. Accounts, cards, and things match. During the storage period, regular sampling inspections should be carried out to prevent failure and deterioration and ensure the quality of materials.

Unqualified materials cannot be issued and used, and unqualified materials are prevented from being used in the project. The equipment should be regularly maintained.

Non-destructive testing is a general term for all technical means to use sound, light, magnetism and electricity characteristics to detect whether there are defects or inhomogeneity in the inspected object without damaging or affecting the performance of the inspected object, and to give information such as the size, location, nature and quantity of defects, and then to determine the technical state of the inspected object.

Personnel engaged in non-destructive testing need to receive professional training and obtain qualifications in order to hold a certificate.

Various countries, regions and institutions have different requirements for non-destructive testing training qualification certification, and they should understand clearly before training, and choose appropriate standards and institutions for relevant training and assessment.

It can not only test the raw materials used in manufacturing, the intermediate process links, and the final product, but also the equipment in service.

Non-destructive testing is to detect defects inside the workpiece and surface defects without destroying the workpiece.

Non-destructive testing is the use of changes in thermal, sound, optical, electrical, magnetic and other reactions caused by abnormalities or defects in the internal structure of materials. A method of inspecting and testing the structure, properties, state and type, nature, quantity, shape, position, size, distribution and changes of defects inside and on the surface of the specimen by means of physical or chemical methods and with the help of modern technology and equipment.

General inspection methods: radiographic inspection (X-ray; R-rays; neutron rays; Ray is currently the more mainstream method).