Submit an Article
Become a reviewer
V. A. Syasko
V. A. Syasko
Saint-Petersburg Mining University
Saint-Petersburg Mining University

Articles

Electromechanics and mechanical engineering
  • Date submitted
    2015-11-25
  • Date accepted
    2016-01-25
  • Date published
    2016-05-01

Measurement of the thickness of the sprayed nickel coatings on large-sized cast iron products

Article preview

Modern industries increasingly use automatic spraying of heat-resistant Nickel  coating with a thickness  of      T = 1-3 mm for large-size parts made of cast iron with nodular graphite. The process of coating application is characterized by time-dependent behavior of its relative magnetic permeability, μс , that is a function of relaxation time, which can be as long as 24 hours, and by μс deviation from point to point on the surface. Aspects of eddy-current phase method for measuring the T value are considered. The structure of four- winding eddy current transformer transducers is described and results of calculation and optimization of their parameters are presented. The influence of controlled and interfering parameters is considered. Based  on the above results, a two-channel combined transducer is developed  providing measurement  error  of ΔТ ≤ ±(0.03T + 0.02) mm  in the shop environment in the process of coating application and in the final product check. Results of tests on reference specimens and of application in production processes are presented.

How to cite: Syasko V.A. Measurement of the thickness of the sprayed nickel coatings on large-sized cast iron products // Journal of Mining Institute. 2016. Vol. 221. p. 712. DOI: 10.18454/PMI.2016.5.712
Instrumentation technology, methods of control and ecology
  • Date submitted
    2013-09-05
  • Date accepted
    2013-11-28
  • Date published
    2014-03-01

Eddy current testing of cfrp structures

Article preview

Specific features of technological processes of manufacturing carbon-fiber-reinforced constructions can cause non-observance of proportions of a reinforcing material and binding, a de-viation of wall thickness, porosity and rupture of threads. Difficult service conditions can lead to internal volume stratifications and formation of cracks. Above told defines necessity of carrying out of complex control of carbon-fiber-reinforced constructions at all stages of their life cycle. It is expediently to use the Eddy Current NDT for that purposes. The device with set of Eddy Current Phase and Eddy Current Frequency transducers have been developed for measurement electro-conductivity and wall thickness of constructions, detection of cracks and internal volume stratifications, and also their depth and the area. Principles of calculation and optimization of parameters of transducers, influence suppression of stirring parameters are considered.

How to cite: Potapov A.I., Syasko V.A., Chertov D.N. Eddy current testing of cfrp structures // Journal of Mining Institute. 2014. Vol. 209. p. 133.