Ultrasonic Lamination Checking

The thermoplastic fibers are activated by mechanical vibrations thus melting and bonding in pre defined patterns.

Ultrasonic lamination checking.

Minimum thickness to perform lamination check using ut in reply to ghulam husain at 11 02 mar 23 2016 opening. Ultrasonic examination has been utilised as a non destructive testing method to carry out a wide variety of testing tasks enabling the equipment to conduct internal examination and make measurements of a component. The general principle of ultrasonic welding can also be applied to nonwoven materials. Ultrasonic scanning us scanning acoustic microscope sam method.

A weld tool referred to as sonotrode transmits the vibration into the nonwoven material. If you mt the edge of our flame cut plates the lamination is a very sharp crack like indication at mid thickness some are 3 inches long. You can find out lamination by ultrasonic testing. It is also a commonly accepted method of checking the wall thickness of pipelines tanks silos and vessels which are suspected of.

I would use the 10 mhz tr probe and calıbrate the tımebase range for 10mm or 20mm. Laminating of nonwoven materials using ultrasonics. The 6 db technique involves obtaining an echo from a position where the reflector extends across the full width of ultrasonic beam and then moving the beam along the reflector until the echo has fallen by half i e by 6 db it is then assumed that only one half of the beam is impinging on the reflector whose edge therefore lies along the beam axis the technique is applicable to both normal angel probes and is most frequently used for the potting of lamination in plate and for measuring. I have come across situations that after years of service lamination in large diameter pipes have been misreported as hic.

The presence of inclusions in the carbon steel plates provides the reliable assessment of possible lamination defects. There are several methods of inclusion detection in the carbon steel plates such as. These are readily detectable yet not rejectable. Ghulam welcome to the forum.

The ultrasonic vibrations are transmitted into the material to be tested using a couplant such as grease paste or water which helps transmission of the vibrations. The better the surface finish then the better is the coupling and the more searching the examination hence there is sometimes a requirement to grind smooth the weld cap and remove the root penetration bead on welded joints. Before ordering the pipes check the astm specification for any supplementary requirements that puts a check on inclusions etc. What screen range ıs your machıne calıbrated for.