End Of Wire Research Articles

Measurement of the impedance for a hybrid X-pinch load

For a hybrid X-pinch load assembled in parallel with the return-current rods, the impedance of the hybrid X-pinch load is important for current division between the load and the current rods. In this paper, the experimental results of the investigation of the impedance of a hybrid X-pinch load on the Qiangguang facility (1.5 MA, 100 ns) were reported. The current of the X-pinch load was measured using a serial nickel foil resistor, and the voltage was measured using a two-stage resistive divider. The inductance of the X-pinch load was obtained by comparing the differential signal of the current with the voltage waveform, and it is about 4.7 nH, which is nearly equal to the calculated total inductance of the metal wire and the two X-pinch electrodes. The resistance of the X-pinch was determined by subtracting a part of the inductance from the measured voltage, and the following results were obtained. At the start of the current, the resistance of the X-pinch increases quickly from the metallic resistance of 0.16 Ω at room temperature for a 2-mm-length 30-μm-diameter Mo wire to 0.8 Ω in about 10 ns, and then, it falls fast to nearly zero, which suggests that the electrically exploding phase of the metal wire ends and the high conductive plasma is formed. As the current continues to flow through the Mo wire, the resistance increases once again from nearly zero to about 0.4 Ω at the moment when the X-pinch begins to burst x-ray radiation, which reflected that the micro-pinch dynamical process occurs and a hot and tight plasma zone is formed. Assuming that the tight plasma zone is 300 μm long with a 10 µm diameter and the temperature of the plasma is ∼1 keV, we can obtain that the resistance of the tight X-pinch spot is about 0.6 Ω, which is close to the value of 0.4 Ω obtained in the experiments.

Quantized and unquantized zero-bias tunneling conductance peaks in Majorana nanowires: Conductance below and above 2e2/h

Majorana zero modes can appear at the wire ends of a 1D topological superconductor and manifest themselves as a quantized zero-bias conductance peak in the tunneling spectroscopy of normal-superconductor junctions. However, in superconductor-semiconductor hybrid nanowires, zero-bias conductance peaks may arise owing to topologically trivial mechanisms as well, mimicking the Majorana-induced topological peak in many aspects. In this work, we systematically investigate the characteristics of zero-bias conductance peaks for topological Majorana bound states, trivial quasi-Majorana bound states and low-energy Andreev bound states arising from smooth potential variations, and disorder-induced subgap bound states. Our focus is on the conductance peak value (i.e., equal to, greater than, or less than $2e^2/h$), as well as the robustness (plateau- or spike-like) against the tuning parameters (e.g., the magnetic field and tunneling gate voltage) for zero-bias peaks arising from the different mechanisms. We find that for Majoranas and quasi-Majoranas, the zero-bias peak values are no more than $2e^2/h$, and a quantized conductance plateau forms generically as a function of parameters. By contrast, for conductance peaks due to low-energy Andreev bound states or disorder-induced bound states, the peak values may exceed $2e^2/h$, and a conductance plateau is rarely observed unless through careful postselection and fine-tuning. Our findings should shed light on the interpretation of experimental measurements on the tunneling spectroscopy of normal-superconductor junctions of hybrid Majorana nanowires.

Synchronization Patterns of Two Coupled Oscillators in a Closed Electrochemical Bipolar Cell

We investigate the dynamical behavior of the oscillatory electrodissolution of two nickel and hydrogen reduction reaction in a closed electrochemical bipolar cell. In the bipolar setup, two half U cells are separated by an epoxy plate with two embedded nickel wires; the oxidation and reduction reactions take place at the two ends of the same wire. By tuning the concentration of electrolyte in the anode and cathode compartments, the current level and the dynamics of the oscillatory range can be varied without any external resistance. Phase analysis of the chronopotentiometric measurements showed that the potential oscillations of the two nickel anodes are completely in-phase synchronized, and thus strongly coupled, when 1.00 mm diameter electrodes were employed. The complete in-phase synchronization and strong coupling effect was lost as the electrode diameter was decreased from 1.00 mm to 0.25 mm. The synchronization effects were interpreted by the charge transfer resistance of the hydrogen reduction reaction as the main coupling element in the cell. The experiments demonstrate the use of bipolar electrochemical cells for the investigation of coupling and synchronization in chemical oscillatory processes.

Evaluation of strategic uprighting of the mandibular molars using an orthodontic miniplate and a nickel-titanium reverse curve arch wire: Preliminary cephalometric study

ObjectiveTo evaluate the overall treatment effects in terms of the amount of uprighting with changes in the sagittal and vertical positions of mandibular molars after applying an orthodontic miniplate with a nickel-titanium (NiTi) reverse curve arch wire (biocreative reverse curve [BRC] system).MethodsA total of 30 female patients (mean age, 25.99 ± 8.96 years) were treated with the BRC system (mean BRC time, 10.3 ± 4.07 months). An I-shaped C-tube miniplate (Jin Biomed) was placed at the labial aspect for the alveolar bone of the mandibular incisors. A 0.017 × 0.025-inch NiTi reverse curve arch wire was engaged at the C-tube mini-plate anteriorly and the first and second premolars and molars posteriorly in the mandibular arch. Pre- and post-BRC lateral cephalograms were analyzed. A paired t-test was used to analyze the treatment effects of BRC.ResultsThe mandibular second molars were intrusively uprighted successfully by the BRC system. Distal uprighting with a controlled vertical dimension was noted on the first molars when they remained engaged in the BRC and the distal ends of the arch wire were laid on the second molars. The mandibular first and second premolars showed a slight extrusion. The changes in the mandibular incisors were unremarkable, while the mandibular molar angulation improved significantly. The lower occlusal plane rotated counterclockwise (MP-LOP 1.13° ± 2.60°).ConclusionsThe BRC system can provide very effective molar uprighting without compromising the position of the mandibular anterior teeth.

Retrograde Transcatheter Perforation in Adult with Pulmonary Atresia and Single Ventricle: A Unique Case of Ventricular Outflow Tract Opening

Radiofrequency-assisted perforation and subsequent balloon dilatation technique is accepted for treating pulmonary stenosis and pulmonary atresia in patients with intact interventricular septum, but its high cost limits the widespread use. Perforation of the atretic pulmonary valve using the stiff end of a coronary wire seems to be an effective alternative to the radiofrequency perforation. We report on a 47-year-old man with a complex cardiopathy including a pulmonary valve atresia, who underwent a partial surgical repair. Due to high surgical risk, a completion could not be foreseen and a percutaneous retrograde perforation of the pulmonary valve was proposed. The perforation was managed by means of BMW wires with stiff tip from the right internal jugular vein because the femoral vein access was not accesible. Following three Armada balloon inflations, an Express stent was properly introduced to keep the ventricular outflow tract (VOT) open. We describe a successful unusual technique of atretic pulmonary valve percutaneous retrograde perforation that can be an efficient alternative when surgery or anterograde percutaneous access are not possible.

At-Home Management Strategies Adopted by Orthodontic Patients During COVID-19 Related Closure of Orthodontic Clinics

OBJECTIVE: The vast spread of COVID-19 not only affected the major businesses of the world but also the health care facilities like dentistry. Due to the unprecedented closure of dental services, on-going orthodontic patients also suffered the brunt. The aim of this study was to assess the at-home management approaches used by the patients to tackle the complications associated with orthodontic treatment. METHODOLOGY: It was a cross-sectional questionnaire-based study carried out from June 15 to September 15, 2020 in orthodontic OPD of Jinnah Medical and Dental College, Karachi. A total of 300 orthodontic patients, 208 females and 92 males between ages from 15 to 35 years completed a questionnaire on the complications faced by them and management techniques adopted by them during COVID-19 related office closures. Convenient sampling method was used for data collection. RESULTS: The majority of patients reported in this study were females. Approximately 69.33% (n = 300) of the responders were females and 31% were males. The highest numbers of complications reported during the lockdown period were loose brackets, loose bands and poking of archwire. The most common at-home hack used was removing the loose bracket/ bands and cutting of free end of arch wire with nail cutter like instrument. CONCLUSION: It is the responsibility of the clinician to keep in touch with their patients during pandemic like situation through telemedicine portal. In case of emergencies, patients should be provided with an adequate amount of information to tackle any complications with ease and without hurting themselves. KEYWORDS: COVID-19, Pandemic, Orthodontic Emergencies

Revascularization of Chronic Iliac Vein Occlusion Using Balloon-Assisted Transseptal Needle Puncture Technique

Abstract Objectives To evaluate the utility of a transseptal needle for balloon-assisted sharp recanalization of chronically occluded central venous structures. Background Chronically occluded central veins are not an uncommon problem, which may arise due to a plethora of reasons. Traditionally, wire and catheter techniques are often used first in an attempt to reestablish flow. When these methods fail, more aggressive techniques are employed, such as sharp recanalization using the back end of wires, Teflon-coated wires, or Rosch–Uchida or Colapinto needles. However, utilization of transseptal needles, traditionally reserved for cardiac procedures, has rarely been described. Methods Transseptal needle was utilized for balloon-assisted sharp recanalization after traditional wire and catheter techniques failed in revascularization of chronically occluded iliac veins. Results Transseptal needle was utilized successfully in two cases in revascularization of chronically occluded central veins. Conclusion Transseptal needle is a viable tool to add to the interventional radiologists’ armamentarium in reestablishing flow in chronically occluded central veins.

Microstructure and Properties of Ti-6Al-4V Articles 3D-Printed with Co-axial Electron Beam and Wire Technology

Advanced additive manufacturing technology of direct energy deposition type called x Beam 3D Metal Printing was employed for manufacturing of articles of various size and shape using titanium Ti-6Al-4V alloy wire as a feedstock material. The key distinctive feature of this process is applying of the hollow conical electron beam generated by low-voltage (< 20 kV) gas-discharge electron beam gun for heating and melting of the substrate and wire, which ensures precisely controllable liquid metal transfer from the wire end to the substrate, specific temperature gradients at the fusion area and heat flow from liquid metal pool. Such conditions of heating, melting and cooling during deposition of molten additive material provide controllable microstructure formation, including grain size and material texture. Influence of processing parameters and cooling conditions on fusion, crystallization, grain growth and intragrain structure of manufactured “chunky” Ti-6Al-4V blocks was discussed. The post-processing heat treatment was used to relieve residual stresses formed during article manufacturing. Tensile and fatigue testing has been performed for samples cut in various directions of produced articles to investigate the material uniformity. Optimization of processing parameters allowed production of 3D printed articles from Ti-6Al-4V with isotropic microstructure and mechanical characteristics which met standard requirements for Ti-6Al-4V material.

Multi-Stroke Lightning Interaction with Wiring Harness: Experimental Tests and Modelling

This paper presents the obtained results of experimental tests and modelling of lightning disturbances that were propagated in a model of aircraft cable bundle and caused by multiple lightning return-strokes interactions. The work is a continuation of previous research, which was concerned mainly with the interaction of lightning discharge with a single return-stroke. The section of the cable harness arranged above the metal plate was investigated. In one of its wires, a multiple-stroke current representing indirect lightning effects was injected from an impulse current generator dedicated to avionics immunity tests. Overvoltages induced at the ends of other wires surrounded by a braided shield, as well as the influence of line parameters and shield grounding condition on the shape and level of observed transients, were examined. The computer simulation results match the measurement data with satisfactory accuracy, and therefore, the presented model can be used to estimate indirect lightning effects in the wiring harness of avionics.

A miniature potentiometric sensor for dopamine determination in vitro

Electrochemical sensors can be used to detect neurotransmitters. A miniature potentiometric all-solid-state coated wire dopamine sensor was investigated in this work. Conducting polymer poly (3,4- ethylenedioxythiophene) doped with poly (styrenesulfonate) as the solid contact was electropolymerized on one end of a gold wire (diameter 0.25 mm). The conducting polymer was covered with a dopamine-selective membrane containing 12-crown-4-tetraphenylborate as a neutral carrier, 2-nitrophenyloctyl ether as a plasticizer and poly (vinyl chloride) as the membrane matrix. The dopamine sensor covered a wide linear range from 10–5 M to 10–1 M with a slope of 53.85 ± 0.93 mV/decade, while the detection limit was 5.80 ± 0.31 µM. The other characteristics of the dopamine sensor were also evaluated. The experimental results showed that the sensor operated properly within the pH range of 5.5–7.5 and displayed good selectivity, fast dynamic response, high reproducibility and long stability. In addition, the dopamine sensor was successfully applied for the detection of dopamine in artificial cerebrospinal fluid by using the standard addition method, indicating that this sensor is promising for applications in dopamine determination in neuroscientific research.

Cold drawing schedules for RSt 34-2 (1.0034) steel wire for correction of overheating defects and breakless ensuring

The paper’s authors researched the defects correction for RSt 34-2 (1.0034) steel wire, obtained as result of its overheating at 1140...1160 °C. Instead of the re-heat treatment method, the authors proposed five cold drawing, annealing and overheating combination schedules, which ensure the increase in strength to DIN EN ISO 6892-1-2020 requirements. The experiments were performed on 4 mm diameter wire with increased grain size (up to 70 μm). It was found that at low initial values of wire material’s ultimate strength and yield strength there are frequent breaks of the wire at ends clamping by tongs. An equation that allows to predict the acceptable cross-sectional area of the wire end sections during drawing has been devised. An inequation for relating the Korber-Eichinger equation parameters and the wire ends sharpened sizes with reduced area due to the tongs jaws deepening after clamping the wire ends has been work out. The authors experimentally proved that the drawing overheated wire process designing taking into account the conditions of this inequation guarantees the elimination of breaks both at the wire end (at the drawing beginning) and at the process stable stage. The drawing processes for overheated wire have been developed eliminated the additional heat treatment operation to overheating defects correction.

Use of cable ties in ilizarov frame assembly: A simple method to prevent wire-related injuries during postoperative care

Introduction Ilizarov ring fixators are usually applied for ailments such as open fractures, infected nonunions, malunions, growth disturbances, and angular deformities. Moreover, such conditions are often complicated by factors such as concomitant infection, compromised soft tissue cover, compromised vascularity, and disturbed metabolic milieu.[12] Treatment of such conditions often requires prolonged external fixations and pin site care plays a vital role in the prevention of infection, increasing longevity of fixation, keeping soft tissues supple, and increasing compliance to weight-bearing regimen.[3] Compliance to pin site care has prudent correlation with surgical outcome. Due to prolonged external fixation periods, usually home-based self-care of pin sites and frame assembly is prescribed to the patient rather than hospital-based care.[4] Problems with Conventional Methods Conventionally, tensioned Ilizarov wires outside wire fixation boltsare bent in loop shape and cut end is pushed under ring towards nearby empty hole.[5] We found such bending to be counterproductive for pin site care, frame maneuvers, and overall compliance of the patient. Multiple bending of wires in adjacent rings decreases available space for any pin site dressing and any correction maneuver. Their loose, sharp ends may potentially prick or scratch hands during any care maneuver. Such bends even impede any possible retensioning of wires in postoperative phase by grossly reducing stress endurance of wires and making them breakage prone [Figure 1a and b].Figure 1: (a) Conventional method of wire management with 2 bends and positioning under Ilizarov ring. (b) Conventional method critically decreases maneuverable space between Ilizarov rings and predisposes to wire-related injuries during frame careImprovisation and its Benefits After learning about practical difficulties being faced by patients in Ilizarov frame care and comprehending multiple feedbacks from patients, we started using nylon cable ties for fastening loose wire ends of Ilizarov wires with adjacent rings [Figure 2a and b].Figure 2: (a) Nylon cable ties – 4-inch length. (b) Clinical use of nylon cable ties with sharp ends of wires fastened to ring and allowing safe assess to pin sitesSuch wire fastenings neatly arrange all wires' ends parallel to ring either to its sides or its undersurface. It frees up maneuverable space between two rings and facilitates better pin site care. It gives practical benefit of saving hands from scratching protruding wire ends and decreasing wire-related injuries during pin site care. Since only one soft bend is given to any Ilizarov wire, it can be easily retensioned without risk of wire breakage during any possible retensioning. Better pin site care prevents local infections and increases comfort of patient. Nylon cable ties are easily available, cheap, and can be easily applied. Such fastening of ilizarov wires does not infringe on any biomechanical principle of Ilizarov methodology and positively contributes to important aspect of postoperative frame care in Ilizarov surgeries. Conclusion Nylon cable ties are easily available, cost-effective, simpler way to organize loose ends of Ilizarov wires which gives more maneuverable space, facilitates better pin site care, and prevents wire-related injuries. Use of cable ties positively influences follow-up care and overall surgical outcome. Financial support and sponsorship Nil. Conflicts of interest There are no conflicts of interest.

Stenting for Common Carotid Artery Stenosis Using the Sheath Pull-Through Technique.

We report the "sheath pull-through technique" for stenting of common carotid artery stenosis (CCAS). In this technique, an 8-10 Fr super-long sheath (SLS) 55-65 cm is inserted into the femoral artery and the brachiofemoral pull-through technique is subsequently used, improving the support of the sheath itself. We pulled both ends of a pull-through wire to further improve the support of SLS, stabilizing guiding catheter (GC) during the procedure in two cases. This technique stabilizes GC during CCAS stenting.

Vision-Based Robotic Solution for Wire Insertion With an Assigned Label Orientation

This paper tackles the problem of wire insertion in switchgear assembly according to the current regulations. In particular, the wire connections require that the wire label has to be oriented facing up in order to simplify and speed up testing and maintenance of the switchgear. The proposed approach exploits the a priori knowledge of the scenario with a calibrated RGB camera and a robotic arm to estimate both wire end pose and label position. The procedure combines several techniques (gradient base, trained classifier and stereo vision) to elaborate standard images in order to extract some wire features related to its shape and label. Specific frames are fixed according to estimated features and then used to correctly complete the task by using a robotic system. Experiments are reported to verify the effectiveness of the proposed approach.

A Comparative Analysis of Force Deflection Property of Nickel-Titanium Wires of Four Manufacturers using Five Point Bending Test: An In-vitro Study

Introduction: Over the last century, material science has made rapid progress. In orthodontics, not only the materials improved, but also the philosophies have changed. Orthodontic wires, which generate biomechanical forces through brackets for tooth movement, are central to the practice of this profession. Aim: To measure the force deflection properties of Nickel-Titanium (NiTi) wires of four manufacturers, used during orthodontic treatment. Materials and Methods: In this in-vitro study, 480 NiTi wires from four different manufacturers [American Orthodontics (AO), 3M-Unitek (3M), Rabbit Force Orthodontics (RO) and Modern Orthodontics (MO)], of various cross-sections was obtained. Samples of each wire were obtained by cutting the straightest distal portion of an arch wire, thus an approximate length of 5.5 cms was recovered. These wires were subjected to a five point bending test. Five lower anterior stainless steel brackets of tooth number 31, 32, 41, 42 (MBT 0.022” Libral traders Centrino brackets) were fixed with the face of the bracket facing upwards on the acrylic block. Each NiTi wire was placed in the slots of orthodontic brackets and secured with stainless steel ligature wires. These wires were subjected to artificial saliva (Wet Mouth) for 30 days at 37°C. This temperature was regulated by using an incubator. The main assessment criterion was the force deflection property of the wire material. Force deflection was measured using a graph paper where initially the wire was placed and plotted on the graph paper. After the deflection of the wire, it was again placed on the same graph paper such that wire ends coincided and the force deflection at the highest point was measured in millimetres using a digital Vernier Caliper (Mitutoyu). The Design of Experiments (DOE) model was used for analysis and a three-way Analysis of Variance (ANOVA) with wire shape as covariate was used for analysing the variability. Results: A 0.014” NiTi wire showed more mean deflection when compared to 0.016” NiTi wire. When a comparison between 0.016”×0.022” and 0.017”×0.025” NiTi wires was done, mean deflection was almost the same. When round and rectangular wires were compared it showed more mean deflection in round wires. When AO was compared with other three manufacturers. A significant difference (p-value &lt;0.0001) was seen in the mean deflection values of MO and RO. When 3M was compared with the other three manufacturers a significant difference (p-value &lt;0.0001) was seen in the mean deflection values of MO and RO. Three-way ANOVA test with wire shape as co-variate showed a significant amount of difference (p&lt;0.0001) for AO, 3M wires with their counterparts. Conclusion: Round NiTi wires showed more force deflection as compared to rectangular NiTi wires. AO and 3M wires were superior as compared to RO and MO wires. Superelastic wires showed more deflection as compared to conventional and heat- activated NiTi. This can be attributed to the property of the wire. Stiffer the wire, less deflection was seen. Cost of the wire also played a role. Cheaper wires were not able to match the quality and standards of their counterparts.

AC 전기장이 인가된 구리 전선을 통해 전파하는 화염에 대해 피복재의 두께에 따른 화염 거동에 대한 실험적 연구

Effects of insulation thickness on flame spread over electrical copper wires with applied AC electric fields were experimentally investigated. The AC volrage and frequency varied in ranges of 0-5 kV and 10-1000 Hz, respectively. A one electrode configuration was used such that the electric potential was applied to one wire end and thus the infinite ambience could be a ground. The results showed that the flame shape and the tilting direction were significantly influnced by applied voltage and frequency. The flame spread rate decreased in an increase of insulation thickness as well as varied sensitively with applied voltage and frequency. Additionally, the molten polyethylene (PE) experienced various dynamic behaviors such as dripping of molten PE, electrospray, di-electro-phoresis, and rotation of molten PE, essentially affecting the flame spread rate. These complicated phenomena were systematically analyzed and discussed.

Finite element study on circular armour wire lateral buckling in umbilicals

The present paper addresses the circular armour wire lateral buckling in umbilicals. An asymmetric non-linear finite element model is developed to analyze a single armour wire subjected to combined constant axial compression and uniform cyclic curvatures. A parametric case study is performed for an armour wire from a nine-hose umbilical cable, where the armour wire pitch number, applied axial compressive load and minimum and maximum curvatures in the applied cyclic bending are varied. The armour wire end shortenings, transverse sliding in cyclic bending, the buckling shapes and equilibrium paths after numerous bending cycles, the critical buckling loads, the stress states at the onset of lateral buckling, and the required number of bending cycles that triggers lateral buckling are obtained and extensively discussed. The critical buckling loads given by the FE model have been compared with an existing analytical formulation, indicating that the analytical model is reliable for small cyclic curvatures. Moreover, an empirical model is proposed for the required number of bending cycles to trigger the lateral buckling and good correlation with the FE results has been observed.

Band structure and end states in InAs/GaSb core-shell-shell nanowires

Quantum wells in InAs/GaSb heterostructures can be tuned to a topological regime associated with the quantum spin Hall effect, which arises due to an inverted band gap and hybridized electron and hole states. Here, we investigate electron-hole hybridization and the fate of the quantum spin Hall effect in a quasi one-dimensional geometry, realized in a core-shell-shell nanowire with an insulator core and InAs and GaSb shells. We calculate the band structure for an infinitely long nanowire using $\mathbf{k \cdot p}$ theory within the Kane model and the envelope function approximation, then map the result onto a BHZ model which is used to investigate finite-length wires. Clearly, quantum spin Hall edge states cannot appear in the core-shell-shell nanowires which lack one-dimensional edges, but in the inverted band-gap regime we find that the finite-length wires instead host localized states at the wire ends. These end states are not topologically protected, they are four-fold degenerate and split into two Kramers pairs in the presence of potential disorder along the axial direction. However, there is some remnant of the topological protection of the quantum spin Hall edge states in the sense that the end states are fully robust to (time-reversal preserving) angular disorder, as long as the bulk band gap is not closed.

The Effects of Load Location on Dropper Stress in a Catenary System for a High-Speed Railway

In this paper, the effects of load location on dropper stress are studied. We treat contact wire as a beam element and derive its response equation and then deduce the stress equation of dropper. A computer code based on MATLAB is written to calculate dropper stress using the finite difference method. The results show that there are three stages during the period of the stress changes of dropper, including instant rebound, damped sinusoidal vibration, and bending compression. The shorter the distance away from a load is, the larger the vertical displacement of the dropper is, which results in the corresponding increases of its stress amplitude and the maximum tensile stress. The load location has a significant impact on the stress changes of dropper. Compared to the condition of the load in the middle, the load acting on the edge of contact wire could induce the larger tensile stress when both ends of contact wire are considered as free boundaries. Therefore, it is necessary to add supports at both ends.

Вплив діаметра електродних порошкових дротів на механічні характеристики електродугових покриттів

The influence of the diameter of the electrode flux-cored wires on the mechanical characteristics of the electric arc coatings is carried out in the work. Electric arc coatings were obtained on the original equipment, developed and manufactured at the Institute of Physics and Mechanics. GV Karpenko NAS of Ukraine. For spraying, model flux-cored wires of basic doping systems Fe – Cr – C and Fe – Cr – B with a diameter of 1.6 and 2.4 mm were used. The influence of the diameter of flux - cored wires on the structure, electric arc coatings from model flux - cored wires of different diameters is investigated. The dependence of porosity, microhardness, adhesion to the steel base, abrasive wear resistance of electric arc coatings sprayed from flux-cored wires with different amounts of charge on the thickness of the lamellae in the coating structure has been established. The influence of the thickness of the lamellae in the structure of coatings sprayed from flux-cored wires with different amounts of charge (depending on their diameter 1.6 and 2.4 mm) on their abrasive wear resistance was determined. It was found that the thickness of the lamellae in the coatings of all analyzed alloying systems increased with increasing volume of molten metal at the ends of flux-cored wires with the corresponding formation of droplets of larger diameter during its dispersion by air jet. shell charge and high arc current. It is shown that the amount of oxide phase in the structure of coatings doubles with increasing spray distance of flux-cored wires from 80 to 120 mm. More oxide phase (40… 100%) was found in coatings formed of flux-cored wires with a diameter of 2.4 mm with a higher filling factor of its shell charge compared to coatings formed of flux-cored wires with a diameter of 1.6 mm with lower filling. This is due to the larger volume of the charge in the powder wires of larger diameter, the cavities between the powders in which are filled with air, which intensively oxidizes the melt droplets inside the powder wires and at their ends during spraying. It is established that the porosity and microhardness of coatings from the developed flux-cored wires increase with the increase of the thickness of the lamellae in their structure and, accordingly, the diameter of the flux-cored wires. The increase in micro hardness is due to less evaporation and burnout of alloying elements from the droplets forming the coating, and the increase in porosity is caused by intensive spraying of droplets when hitting the sprayed surface, which contributes to micro cavities between the lamellae of the coating. It was found that with increasing the thickness of the lamellae in the structure of coatings of flux-cored wires 250H21VFGS and flux-cored wires 50HN2R5GS their adhesion to the steel base decreased slightly due to the occurrence of tensile stresses in coatings, which cause micro cracks or cracks. At the same time, the adhesion of 50X6MG2C flux-cored wire coatings to steel increased due to the higher carbon content of large lamellae and favorable conditions for the formation of high-carbon martensite, which has the lowest coefficient of thermal expansion and causes the lowest residual tensile stresses. It was found that the abrasive and gas-abrasive wear resistance of coatings from flux-cored wires 250Х21ВФГС decreased, and from flux-cored wires 50ХН2Р5ГС increased due to the increase in the thickness of the lamellae in their structure using a larger diameter.