scholarly journals Development of quality control and structure parameters determination methods for large size products from sintered hard alloys WC-(Co+Ni+Cr) based on analysis of the ultrasonic oscillations spreading parameters

2021 ◽  
Vol 4 (2(60)) ◽  
pp. 33-38
Author(s):  
Volodymyr Pashynskyi ◽  
Igor Boyko
Keyword(s):  
Quality Control ◽  
Flaw Detection ◽  
Statistical Characteristics ◽  
Binder Phase ◽  
Hard Alloys ◽  
Structure Parameters ◽  
Ultrasonic Oscillations ◽  
Non Destructive ◽  
Skeleton Structure

The object of research is hard alloys with a morphology of the carbide phase skeleton structure, in which particles contact with each other, and the gaps between them are filled with a binder phase. The mechanical and service characteristics of such materials depend on the degree of development of the skeleton structure. One of the most problematic areas is the lack of non-destructive methods for determining the parameters of the structure. The introduction of such techniques will allow obtaining objective information on the structure of the material and using it to evaluate the quality of products. In the course of the study, the parameters of the scattering of elastic vibrations in inhomogeneous media were determined. The main hypothesis of the study is the assumption that the processes of energy dissipation occur both in the structural elements themselves (carbide grains and bond areas) and at their boundaries. Therefore, the evaluation of dissipation processes will allow obtaining a quantitative estimation of the alloys structure parameters, and will allow assessing the quality of the material. The following characteristics were chosen as the parameters characterizing the propagation of ultrasonic oscillations: the speed of the oscillations propagation, the scattering background level in relation to the amplitude of the bottom reflection, the oscillations attenuation coefficient. The parameters were determined and compared with the characteristics of the quality of the products and the parameters of the microstructure, which were determined by the methods of quantitative metallography and the statistical characteristics of the relationship between the parameters, were determined. As a result, new quality control procedures for carbide products have been developed. The contiguity characteristics of the carbide skeleton of the sintered cemented carbide were determined by measuring the propagation speed of ultrasonic oscillations. The assessment of the level of porosity with a pore size of less than 1 mm was carried out according to the results of measuring the relative amplitude of the background scattering of ultrasonic oscillations. The proposed methods are non-destructive and are carried out in one cycle with ultrasonic flaw detection, to which 100% of the products are subjected. These techniques have been introduced in the production of carbide rolls by the method of controlled hot vacuum pressing. They have become an integral part of the quality control system for carbide rolls.

scholarly journals Agricultural machine parts quality control by dynamic non-destructive methods

2018 ◽  
Vol 226 ◽  
pp. 04034 ◽  
Author(s):  
Alexey N. Beskopylny ◽  
Viktor B. Rykov ◽  
Elena M. Zubrilina ◽  
Andrey D. Chistyakov
Keyword(s):  
Quality Control ◽  
Wear Resistance ◽  
Manufacturing Process ◽  
Mechanical Characteristics ◽  
Point Of View ◽  
Agricultural Machinery ◽  
Machine Parts ◽  
Non Destructive ◽  
Destructive Methods

The problem of quality control of agricultural machinery parts by means of dynamic non-destructive methods of impact indentation of conical shape indenters is considered. Quality of the crucial parts is considered from the point of view of a set of mechanical characteristics that determine the strength, hardness, wear resistance and deformability. These characteristics must be known and be able to control on all the details promptly and accurately both in the manufacturing process and in operation. The mechanical characteristics of metals are stochastic in nature. For this purpose, an impact indentation device was developed, and the method based on probabilistic laws of dispersion of mechanical characteristics is obtained.

Анализ параметров ультразвуковых сигналов при высокоскоростном контроле рельсов

2021 ◽  
Vol 3 ◽  
pp. 3-16
Author(s):  
А.А. Марков ◽  
Е.А. Максимова
Keyword(s):  
High Speed ◽  
Flaw Detection ◽  
Scanning Speed ◽  
Integral Parameter ◽  
Destructive Testing ◽  
Detection Systems ◽  
High Speeds ◽  
Bolt Holes ◽  
Non Destructive

The results of studies of changes in the parameters of ultrasonic (US) signals with an increase in the speed of rail testing are presented. Signals from rail bolt holes were selected as test reflectors. It is shown that the holes closest to the rail joint are not fully sounded, and the signals from them cannot be used as test reflectors. For a full assessment of the decrease in the quality of non-destructive testing of rails with an increase in the scanning speed, it is proposed to use the integral parameter of the analyzed reflector. A noticeable decrease in this parameter at high speeds requires a trade-off when choosing between productivity and quality rail testing. The proposed technique can be used to assess the efficiency of operating and newly created flaw detection systems. The necessity of improving the methods of sounding the first bolt holes of joints and correcting regulatory documents for high-speed testing of rails is substantiated.

The Non-Destructive Test Method as A Simple Way to Evaluate the Quality Of Metal Core Pcbs for High Power Micro-Assemblies

2017 ◽  
Vol 8 (2) ◽  
pp. 281
Author(s):  
A.V. Sukhanov ◽  
A.I Artemova ◽  
R.S Litvinenko
Keyword(s):  
Quality Control ◽  
Heat Sink ◽  
Poor Quality ◽  
Test Method ◽  
Joint Interface ◽  
Layer By Layer ◽  
Metal Core ◽  
Before And After ◽  
Non Destructive

<p>The article describes the necessity of an incoming quality control of the delivered power electronics elements especially at the stage of choosing a reliable supplier. In particular, in the field of the metal core PCBs production, there is a need to control not only its heat sink parameters, but also to control the quality of the joint interface of the metal core PCBs. Since the use of poor-quality materials or the violation of the technological process by the manufacturer can lead to the defects in the PCBs structure. Thus it can affect the heat sink efficiency and the reliability of the entire assembly. The article proposes and describes the method of nondestructive incoming quality control of metal core PCBs. This method is based on the use of ultrasonic layer-by-layer scanning for obtaining the internal structure of PCBs. The article presents the results of applying this method for the PCBs of various manufacturers. The data of the structure visualization and the influence of environment temperatures changes were also obtained. The result pictures of the tested samples before and after the thermal circling were obtained to study the possible degradation of the PCBs structure and its parameters.</p>

scholarly journals IMPROVING THE CAPILLARY METHOD OF NON-DESTRUCTIVE TESTING

2019 ◽  
pp. 33-38
Author(s):  
V. V. Lopatin
Keyword(s):  
Quality Control ◽  
Aerospace Industry ◽  
Flaw Detection ◽  
Non Destructive Testing ◽  
Labor Costs ◽  
Destructive Testing ◽  
Wetting Ability ◽  
Capillary Method ◽  
The Cost ◽  
Non Destructive

The history of capillary control began in the 40s of the last century for the needs of the aerospace industry. Currently, the cost of quality control in the aerospace industry is up to 12 - 18% of the cost of products. Similar amounts of expenses in the nuclear and defense industries are not lagging behind other industries. For example, for the control of welded joints of oil and gas pipelines of large diameter and considerable length, the labor costs for inspection reach 10% of the total labor costs. Capillary quality control method is based on the ability of indicator liquids (penetrants) to penetrate into the cavities of surface defects (discontinuities). Over the 70 years of its existence, the capillary method of control has not undergone fundamental changes, and its principles have remained unchanged. In international practice, the abbreviated designation of types of non-destructive testing (AWS) is adopted, and the control with the use of penetrating liquid denoted RT. This method is applicable to the detection of all types of surfacedead-end and through defects, such as cracks, delamination, leaks, in products made from any non-porous materials, including glass, ceramics, plastics and other non-metallic materials. The analysis of the capillary method of nondestructive testing of the surface of a solid body is carried out, the possibilities and ways of its improvement are indicated. The method of the capillary method of non-destructive testing of a solid surface, the physics of the method and its implementation are considered in detail. It is shown that the wetting ability and spreading are important characteristics of capillary control fluids; therefore, they must be evaluated and analyzed when developing new ones, choosing or comparing known capillary flaw detection materials. The possibility of using the Rebinder effect to improve the capillary method of non-destructive testing of a solid surface has been proved. A refined method of capillary defectoscopy is proposed by taking into account the wetting ability, density, viscosity and evaporation of a liquid, which makes it possible to make an optimal choice of liquid to ensure high efficiency of surface (capillary)control. An improved method for assessing the wetting ability of liquids is proposed, which makes it possible to evaluate the wetting ability of liquids by the size of the spreading spot of their droplets, taking into account the influence of density, viscosity and evaporation of liquids intended for capillary flaw detection (penetrants).

Locomotive Wheel Inspection With EMAT Technology

2004 ◽  
Author(s):  
B. R. Tittmann ◽  
S. Jayaraman
Keyword(s):  
Signal To Noise Ratio ◽  
Flaw Detection ◽  
Acoustic Transducer ◽  
Catastrophic Failures ◽  
Contact Sensor ◽  
Lift Off ◽  
Electro Magnetic ◽  
Non Destructive ◽  
Locomotive Wheels

There is a need to analyze locomotive wheels for flank cracks in a non-destructive manner in order to prevent catastrophic failures. Flaw, shape, and size are desired parameters in establishing the quality of commercial tires. A variety of defects such as voids, inclusions, surface and internal cracks, or the like, must be discerned in order to prevent failure. This paper exhibits and compares the benefits of a number of different techniques used for flaw detection. Non-destructive evaluation (NDE) techniques used are magnetic particle inspection, dye penetrant, eddy current, electro-magnetic acoustic transducer (EMAT). The techniques vary in their ability to ascertain the flaw characteristics. Using a non-contact sensor such as the EMAT, to scan the wheels in an automated manner offers greater inspection speed at lower manpower. This paper reviews the basic concept of EMATs, introduces a recently developed technique for simulating EMAT performance by Finite Element calculation and features bench top results of waveform acquisition and signal-to-noise ratio dependence on lift-off. Next presented are calibration results for spark-eroded flaws in wheel sections for a variety of locations and sizes. Finally data are on flaw detection in a railroad service facility on several locomotives with wheels spinning at speeds up to 40 meters/minute. Results for both artificial and actual flaws are shown.

Advanced Ultrasonic Testing Technologies with Applications to Evaluation of Steel Bridge Welding - An Overview

2015 ◽  
Vol 727-728 ◽  
pp. 785-789 ◽  
Author(s):  
Zhi Bin Lin ◽  
Fardad Azarmi ◽  
Qusay Al-Kaseasbeh ◽  
Mohsen Azimi ◽  
Fei Yan
Keyword(s):  
Quality Control ◽  
Ultrasonic Testing ◽  
State Of The Art ◽  
Flaw Detection ◽  
Steel Bridges ◽  
The State ◽  
Steel Bridge ◽  
Non Destructive Evaluation ◽  
Non Destructive ◽  
The Way

Non-destructive evaluation (NDE) methods are widely accepted for quality control of welding in steel bridges. Recent development of advanced ultrasonic testing technologies enriched the categories of NDE methods used for steel bridges and more importantly these enhanced techniques provided more effective flaw detection and characterization. No guidelines, however, is available in existing bridge welding code for their more widespread applications to bridges. In this study, we overview the state-of-the-art advanced ultrasonic testing technologies in welding inspection. Benefits of the enhanced ultrasonic testing technologies are summarized, aiming to pave the way for deciding methods need for various steel bridge welding inspections.

scholarly journals Quality control of hardening technologies using the acoustic emission method

2021 ◽  
Vol 266 ◽  
pp. 04004
Author(s):  
E.V. Grigoriev ◽  
A.G. Palaev ◽  
T.S. Golikov ◽  
V.V. Nosov
Keyword(s):  
Quality Control ◽  
Acoustic Emission ◽  
Service Life ◽  
Experimental Research ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Industrial Facilities ◽  
Non Destructive

The ways of increasing the reliability and service life of industrial facilities are considered. The types of hardening technologies and methods of their control are analyzed. An approach that makes it possible to evaluate the quality of hardening technologies based on the registration of acoustic emission (AE) is described. The results of experimental research on the quality of three types of strengthening technologies are presented and the effectiveness of the proposed approach is shown. The obtained results can be used to assess hardening technologies at real facilities in a non-destructive way.

Non-destructive quality control methods in additive manufacturing: a survey

2020 ◽  
Vol 26 (4) ◽  
pp. 777-790 ◽  
Author(s):  
Paschalis Charalampous ◽  
Ioannis Kostavelis ◽  
Dimitrios Tzovaras
Keyword(s):  
Quality Control ◽  
Additive Manufacturing ◽  
Complex Objects ◽  
Destructive Testing ◽  
Content Type ◽  
Wide Range ◽  
Manufacturing Procedure ◽  
Direct Energy ◽  
Non Destructive

Purpose In recent years, additive manufacturing (AM) technology has been acknowledged as an efficient method for producing geometrical complex objects with a wide range of applications. However, dimensional inaccuracies and presence of defects hinder the broad adaption of AM procedures. These factors arouse concerns regarding the quality of the products produced with AM and the utilization of quality control (QC) techniques constitutes a must to further support this emerging technology. This paper aims to assist researchers to obtain a clear sight of what are the trends and what has been inspected so far concerning non-destructive testing (NDT) QC methods in AM. Design/methodology/approach In this paper, a survey on research advances on non-destructive QC procedures used in AM technology has been conducted. The paper is organized as follows: Section 2 discusses the existing NDT methods applied for the examination of the feedstock material, i.e. incoming quality control (IQC). Section 3 outlines the inspection methods for in situ QC, while Section 4 presents the methods of NDT applied after the manufacturing process i.e. outgoing QC methods. In Section 5, statistical QC methods used in AM technologies are documented. Future trends and challenges are included in Section 6 and conclusions are drawn in Section 7. Findings The primary scope of the study is to present the available and reliable NDT methods applied in every AM technology and all stages of the process. Most of the developed techniques so far are concentrated mainly in the inspection of the manufactured part during and post the AM process, compared to prior to the procedure. Moreover, material extrusion, direct energy deposition and powder bed processes are the focal points of the research in NDT methods applied in AM. Originality/value This literature review paper is the first to collect the latest and the most compatible techniques to evaluate the quality of parts produced by the main AM processes prior, during and after the manufacturing procedure.

scholarly journals DEVELOPMENT OF THE METHOD OF NON-DESTRUCTIVE QUALITY CONTROL OF HARDENED CYLINDER SLEEVE OF AUTOTRAKTOR EQUIPMENT

2021 ◽  
Vol 295 (2) ◽  
pp. 275-277
Author(s):  
B. BRATSLAVETS ◽  
Keyword(s):  
Quality Control ◽  
Base Metal ◽  
Piston Ring ◽  
Operating Conditions ◽  
Dust Particles ◽  
Chemical Corrosion ◽  
Gaseous Products ◽  
Working Surface ◽  
Non Destructive

The main part of tractor engines is the cylinder liner, which depends on the life of the machine as a whole. It is made of gray cast iron (SCh20 DSTU 1412-85) with the addition of alloying elements and subjected to the working surface of HDTV hardening. Now quality control is carried out by destructive methods (assessment of hardness, durability, structure) on specially cut templates on 1 piece. from a party to 80-100 pieces of each melting. Such control does not ensure the reliability of products, both in the quality of the base metal and heat treatment. The solution to this problem is possible by developing non-destructive quality control of each product in different periods of the process process with assessment of the properties and stress level of both the base metal (corresponding to the outer surface) and the hardened layer (inner working surface). The intensity of cylinder wear depends on the conditions of friction of the cylinder-piston ring, which are affected by the design features of the engine (power, speed, compression ratio, cooling system, as well as fuel supply and combustion, air and oil purification system), quality of fuel and oil, operating conditions and wear resistance of the cylinder material. Wear of cylinders during friction paired with a piston ring during engine operation occurs as a result of a combination of many processes occurring simultaneously: destruction of microprojections of surfaces that are destroyed by repeated plastic deformation during engagement, as well as the destruction of tired origin; setting of the material of the microprojections with subsequent deep tearing of the metal particles during the destruction of the setting unit; accumulation of abrasive particles that contribute to the intensification of wear; abrasive action of dust particles, contribution products, solid inclusions on the surface of collapsing bodies; chemical corrosion under the influence of high temperatures of gaseous products of fuel combustion; electro-chemical corrosion from the action of acids formed during the dissolution of gaseous products in condensed water vapor on the walls of the cylinders.

scholarly journals Laser-ultrasound diagnostics of plastic products made by the additive technologies

2021 ◽  
Author(s):  
Mikhail Mikhailovich Novikov ◽  
Larisa Viktorovna Novikova ◽  
Elena Vasilievna Savateeva ◽  
Varvara Arkadyevna Simonova
Keyword(s):  
Flaw Detection ◽  
Additive Technologies ◽  
Laser Ultrasound ◽  
Modern Development ◽  
Good Spatial Resolution ◽  
Ultrasound Diagnostics ◽  
The Impact ◽  
Non Destructive ◽  
Plastic Products

This paper discusses the application of methods of non-destructive testing and flaw detection of plastic products manufactured by additive technologies. The modern development of additive technologies associated with the active transition from the manufacture of prototypes and test samples to the manufacture of functional products increases the requirements for improving the quality of manufacturing and conducting non-destructive diagnostics of finished products, including plastic materials. The overall productivity of the production process can be increased by increasing the yield due to a decrease in the number of defects, which is ensured by process control and the quality of finished products. The method of laser-ultrasound diagnostics allows monitoring and flaw detection of products made of different materials with good spatial resolution, which is not always possible, for example, by tomographic scanning. Thus, the main purpose of this work is to evaluate the possibility of using laser-ultrasonic methods to detect potential defects and to track the impact of the additive manufacturing process on the quality of plastic products.

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