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Domov>Kasting za investicijo>Nadzor kakovosti>Neporušitveno testiranje (NDT)

Neporušitveno testiranje (NDT)

We offer a wide variety of in-house investment casting quality verification and product testing services to find casting defects through destructive and non-destructive testing design to provide our customers with the highest quality cast product. No matter where the product is applied, each precision investment castings is inspected and approved before delivery. Inspection allows foundry and clients to feel confident they have a quality casting.

Neporušitveno testiranje (NDT)

Nondestructive Testing (NDT) is one of the main procedures of quality control in steel casting, and plays an important role in assuring that steel castings will perform well during service. Non-destructive testing is done by our foundry QC person, customers’ QC engineers, and third-party NDT technicians to verify the internal and external soundness of a casting, these tests are performed in a manner that does not affect the future usefulness of steel castings and without damaging the casting itself.

Non-destructive Testing (NDT) Methods Performed on Steel Investment Casting

Vizualno in optično testiranje (VT)

Vizualni pregled je lahko učinkovit način za prepoznavanje površinskih nepopolnosti, ki bi lahko negativno vplivale na naše jeklene ulitke. Vizualni izpraševalci uporabljajo znanje o izdelavi jeklenih litih delov, funkciji človeškega očesa, zahtevah glede osvetlitve in natančnih merilnih orodij za ocenjevanje materialov.
Inšpekcijski pregled tekočega barvila (LPI)

LPI is a testing method used for surface defects of all metal investment castings. In this inspection process, the tester first cleans the casting to remove any particles of grit or dust that may prevent the liquid dye from going into cracks in the metal. Once clean and dry, a dye solution with color is applied to the surface of the castings. The dye, which is suspended in penetrating oil, finds its way into the surface defects. When a special developer is applied, the casting defects become clearly visible. The solution is to detect any cracks or other surface defects due to porosity or gas that produced on the surface. Sometimes it is difficult to find the surface defects by naked eye, such as tiny cracks, pores or other surface defects.

Inšpekcijski pregled tekočega barvila (LPI)

Pregled magnetnih delcev (MPI)

MPI je podoben LPI po tem, da se uporablja za iskanje majhnih razpok in lukenj na ali blizu površine ali plitke podpovršine ulitkov. To se doseže z induciranjem magnetnega polja v feromagnetni material in nanosom železnih delcev na površino preučenih kovinskih ulitkov. Testiranje MPI je priročno in cenovno ugodno. Razpoke in okvare imajo drugačne magnetne lastnosti kot tiste okoliškega materiala. Njihova prisotnost bo prekinila magnetno polje, kar bo povzročilo popačenje, kar kaže na obliko in položaj razpoke ali praznine.

Ultrazvočno testiranje (UT)

Ultrasonic Examination finds defects by using high frequency acoustic energy transmitted into a steel casting, to detect discontinuities or locate changes in material characteristics. Sound waves travel through a casting until they hit the opposite surface or an interface or defect. Any barrier reflects the sound waves, which bounce back and are recorded for an analyst to look at. Ultrasonic Testing (UT) in a technology similar to the ultrasounds used by medical technicians

UT tester

Rentgenski pregled (rentgenski pregled)
Radiografski pregled vključuje uporabo radioaktivnih izotopov (žarkov gama) ali rentgenskih žarkov na jeklenem ulitku za ustvarjanje slik ali filmov. Duhovne slike, ustvarjene z vlivanjem rentgenskih žarkov, kažejo temne lise, kjer so votline zaradi krčenja, majhne prelome in razpoke toplotnega razpokanja ali luknjičaste pike poroznosti. Te slike pomagajo izkušenemu kovinarju pri odločitvi, ali so mehanske lastnosti ulitkov ogrožene zaradi krčenja, vključkov ali lukenj in ali jih je mogoče popraviti pred odpremo ulitkov.

After all of the inspections are completed, we will submit all the reports with related photos for our customer approval. Then we’ll arrange the shipment once we got the approval from our customer. If you have any request for metal castings, please do not hesitate to email Ningbo Investment Casting Co., Ltd for price.