№ 1(59) - March 2013

Main Feature: NDT of Layers and Coatings

NDT of Layers and Coatings

V. L. Vengrinovich. Testing and Diagnostics of Surface Layers and Coatings. Trends and Prospects.

This article is not an overview of modern surface layers NDT methods. It is rather an author’s personal opinion on tendencies in this NDT field. The article though gives some ideas of missions brought up by the modern level of surface treatment technology: increase of flaw types selective sensitivity; resolution increase up to sub-micron values; necessity of surface layers diagnosis with characteristics depth resolution; diagnosis of multilayer and multicomponent coatings, surface layers treated with concentrated sources of energy.

V. A. Syasko, D. N. Chertov. Lamination Detection in Carbon Fiber Reinforced Plastics with the Use of Tangential Eddy Current Transducers.

The construction principles of probes for lamination detection in the carbon fiber structures are described in the article. Principles of probes characteristics calculation and optimization are presented as well as methods of stray parameters suppression. Design and main technical characteristics of the probes are given.

V. A. Syasko, A. E. Ivkin. Measurement of Precious Metal Coating Thickness with Use of Eddy Current Testing.

The article considers matters of eddy current phase thickness gauge development for measuring (with stray parameters suppression) of precious metal coating thickness on parts of non-ferromagnetic electro-conductive materials.

J. Whitmer, J. Hansen. A Validation of Barkhausen Noise Inspection Through Chrome Plating Using Temper Etch Inspection.

The following paper will present data from extensive automated Barkhausen Noise Testing on 39 individual aircraft landing gear parts of the same design and compare this data to Temper Etch inspection results. The part being investigated is a chrome plated slender tube made of 300M steel which has proven to be susceptible to grinding burns. The basics of the grinding, plating, and inspection procedures will be given along with evaluation of the data to include discussion on differentiating between grinding burns and residual stresses.

V. E. Prokhorovich, V. G. Shipsha, I. Yu. Kinzhagulov, V. A. Kaloshin, A. A. Lukhvich, V. A. Rudnitsky. Prospective Devices for Coatings Thickness Measurements on Liquid-Propellant Rocket Engine Elements.

Quality and reliability of rocket engines substantially depends on and is assured by means of special coatings. Coating thickness and evenness of their deposition are strictly regulated; their conformity with part specifications is defined with NDT methods and instruments. The problem of coating thickness inspection is sharply posed at the liquid-propellant rocket engines manufacturers. The article considers new devices for nickel, chromium-nickel and metal-ceramic coatings thickness measuring.

O. N. Budadin, Yu. G. Kutyurin, O. V. Yukhatskova. Optimization of Thickness Measurement Technology of Rubber-Like Covering on a Diverse Substrate with Use of Eddy Current Testing.

It is shown that thickness of rubber-like covering on a heterogeneous conductive metal substrate can be measured with use of eddy current testing. The main problem is to provide maximum testing accuracy on the condition that thicknesses of rubber and metal substrate are constructively changed which results in necessity to repeatedly readjust the device. This problem is solved by optimal selection of surface clusters which have, on the one hand, a maximal area, and, on the other hand, provide a minimal error of measurement; a maximal error of measurement in this case is not more than 3%.

Industrial Safety

V. G. Shtengel. Ways and Means of Cavities Location and Sizing Under Metal Facings of Hydraulic Engineering Construction Elements THERE IS A PROBLEM! WHO CAN HELP?

There is a problem of reliable long-term use of hydraulic engineering constructions faced with metal. Ways and means of how locate and reveal a cavity under facings and estimate its size under natural conditions and with one-sided access to the construction is unknown to the author. Tapping with a hammer does not enable to distinguish between thin gaps and volume cavities. The author applies to NDT specialists with a request to help with solving abovementioned problem.

Patents

O. A. Sherman. Review of Patents for Invention and Useful Models on Metal Goods NDT Issued in Russian Federation within 2006 – 2010.

Abstracts

M. V. Rozina, T. Yu. Sharapova. Abstracts of the Articles Published in Other Sources.

Radiation Inspection

A. V. Baranov, V. B. Bogod. Digital Radiography of Welds.

NDT World News

M. Ya. Grudsky. News of Russian Society of NDT and TD.

T. Yu. Sharapova. The Internet News.

NDT in the Railways

D. V. Balabkin, V. A. Yastrebov, S. R. Tsomuk. Automated Systems for Ultrasonic Testing of Car Axes: Experience of “ZOND-3” System Operating and Adoption.

Features and the basic technical characteristics of “UltraMag-01” and “ZOND-3” automated equipments for ultrasonic testing of car’s axes as well as operating and adoption experience of “ZOND-3” equipment at two Russian carload enterprises are considered.

A. A. Markov, V. V. Mosyagin, E. A. Kuznetsova. Detection of Rail Defects under Close Conditions.

Actual matters of rail testing under close conditions are considered: considerable wear and surface damages of rail head, welded joints, low ambient temperatures. The authors show the possible directions of solving abovementioned tasks.