BAIJIAN - Third party testing organization
Non destructive testing of steel structures:
1. Radiographic testing
Radiographic testing is a technique that uses the intensity attenuation of rays passing through materials or workpieces to detect internal structural discontinuities. When passing through materials or workpieces、 the intensity of the radiation varies、 and the degree of sensitivity on the photosensitive film also varies、 resulting in internal discontinuous images Radiographic testing is mainly applied to the detection of internal defects in metals、 non-metals、 and their workpieces、 with high accuracy and reliability of detection results. The film can be stored for a long time、 has good traceability、 and is easy to determine the nature of defects and the plane position they are located in Radiographic testing also has its shortcomings、 making it difficult to determine the depth of defects buried inside materials and workpieces. Linear defects perpendicular to the material or workpiece surface are prone to missed or misjudged. At the same time、 strict protective measures should be taken during radiographic testing to prevent radiation from causing harm to the human body. The detection equipment is complex and costly Radiographic testing is only applicable to planar testing of materials and workpieces、 and is powerless for testing irregular parts、 T-shaped welds、 fillet welds、 etc
2. Ultrasonic Testing
Ultrasonic testing is a technology that utilizes the acoustic characteristics and internal organizational changes of materials (workpieces) to have a certain impact on the propagation of ultrasonic waves when they propagate in metal、 non-metallic materials and workpieces. By detecting the degree and condition of ultrasonic waves、 the performance and structural changes of materials (workpieces) can be understood Ultrasonic testing、 like radiographic testing、 is mainly used to detect internal defects in materials (workpieces). High detection sensitivity、 easy operation、 fast detection speed、 low cost、 and no harm to the human body、 but ultrasonic testing cannot determine the nature of defects; The detection results have no original records and poor traceability Ultrasonic testing also has unparalleled advantages over radiographic testing、 as it can detect complex components such as irregular components、 fillet welds、 T-shaped welds、 etc; At the same time、 the burial depth of defects in the material (workpiece) can also be detected
3. Magnetic particle testing
Magnetic particle testing is the use of magnetic flux leakage and suitable testing media to detect discontinuities on the surface and near the surface of materials (workpieces) Magnetic particle testing、 as a surface inspection、 has the characteristics of flexible operation and low cost. However、 magnetic particle testing can only be applied to the detection of surface or near surface defects in ferromagnetic materials and workpieces、 and cannot detect defects in non-magnetic materials and workpieces Like ultrasonic testing、 magnetic particle testing has no original records and poor traceability、 making it impossible to detect deep defects in materials and workpieces、 but it is not limited by the shape of materials and workpieces
4. Penetrant inspection
Penetrant inspection is a detection method that uses the capillary action of liquid to penetrate the penetrating liquid into the open defects on the surface of solid materials and workpieces、 and then sucks out the penetrating liquid infiltrated by the imaging agent to display the presence of defects on the surface.
Penetrant inspection is simple、 cost-effective、 and time-consuming. It can only detect the penetration and surface opening defects of materials and workpieces、 and cannot detect defects that only exist internally
5. TOFD detection
The TOFD principle is that when ultrasonic waves encounter defects such as cracks、 a diffraction wave superimposed on the normal reflection wave will occur at the tip of the defect. The probe detects the diffraction wave、 which can determine the size and depth of the defect.
When ultrasonic waves exhibit propagation barriers at linear discontinuities with defects、 such as cracks、 in addition to normal reflected waves、 diffraction phenomena also occur at the crack endpointsFunction of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific、 fair、 and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problemsinspection and testing process:
1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
1. The testing industry is fully covered、 meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing、 with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle、 low cost、 and attentive service 7. Possess authoritative qualifications such as CMA、 CNAS、 CAL、 etc 8. The testing report is authoritative and effective、 and is generally used in China