Identification of welding quality of Xray inspection standard

Date：2021-12-24 11:50:54 Views：1641

Xray detection welding digital real-time imaging is a high-tech product mainly composed of high-frequency mobile (fixed) X-ray flaw detector, high-resolution industrial TV system, computer image processing system, mechanical and electrical system and ray protection system. It mainly relies on X-ray to penetrate the object and store the characteristics of the image, so as to carry out nondestructive evaluation on the interior of the object. Through welding experiment verification (manual welding, automatic welding, argon arc welding), the weld can be divided into silver white, golden yellow, multicolored (golden yellow + blue), blue, dark blue, gray black (shiny), dead black and gray, etc. Welding color represents welding quality, which is closely related to welding process parameters and welder's technical level.

X-ray detection reference standard: reference standards: ipc-a-610e acceptance standard for electronic assemblies, GB / T 17359-1998 general rules for quantitative analysis methods of electron microprobe and scanning electron microscope X-ray energy spectrum

Meaning of X-ray detection: X-ray detector uses low-energy X-ray to quickly detect the internal structure of the tested object without damaging the tested object. X-ray penetration generated by high-voltage impact target is used to detect the internal structure quality of electronic components and semiconductor packaging products, as well as the welding quality of various types of SMT solder joints.

objective: carry out defect inspection, failure analysis, highly reliable screening, quality evaluation and process improvement of products.

Application scope of welding quality inspection: it is applicable to nondestructive testing in, electronics, petroleum, chemical industry, refractory, steel pipe, die casting, boiler, automobile, pressure vessel, high-speed railway, aviation, aerospace and other industries.

Welding quality inspection and test steps: confirm the material / size of the sample → put it into the testing equipment → image analyze the defect → mark the defect type and location.

Due to the difference of ambient temperature, weldment thickness, weldment size and welding speed, the applicable parameters are also different. Of course, when welding large weldments with large wall thickness, the current should be greater. If necessary, multi-layer and multi pass welding shall be used, and the temperature between layers shall be controlled. Otherwise, the appearance quality of the weld may be very beautiful and cannot reach the internal welding quality. requirement. When multi-layer and multi pass welding is used, the previous weld can be cooled, and then the surfacing of the next weld can be carried out, and the effect will be better. In automatic welding, the welding speed and wire feeding speed must also match the corresponding current and voltage. In order to achieve the best welding effect on the same weldment, if the welding speed is changed, the current and voltage or the speed of the wire feeder must be changed. The faster the welding speed and the higher the voltage, the faster the wire feed speed. However, considering the melting and welding quality of metal, the best welding speed, current, voltage and heat input should be selected to ensure the welding quality.

If you look directly at the quality of general welding technology, it is to do visual evaluation (VT). The weld surface is well formed without defects such as pores, ridges and slag inclusion. The internal defects of the weld need to be detected with the help of instruments, such as metallographic, radiographic, macro fracture test, etc. The final welding technology is based on the welded joint performance. If the strength of the joint performance can reach more than 90% of the base metal, the technology is good.

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