Optimization of a Specimen Size for the Determination of the Diffusible Hydrogen Content in Metals

2014 ◽  
Vol 698 ◽  
pp. 466-471
Author(s):  
Oleg V. Panchenko ◽  
Alexey M. Levchenko ◽  
Victor A. Karkhin
Keyword(s):  
Hydrogen Content ◽  
Calculation Method ◽  
Specimen Size ◽  
Experimental Results ◽  
Diffusible Hydrogen ◽  
Measuring Methods ◽  
Deposited Metal ◽  
Calculation Results

Specimens of various sizes are used to determine hydrogen content in deposited metals in such standards as ISO 3690, AWS A 4.3, and GOST 23338 while measuring methods are the same. It causes problems in comparison of experimental results and brings up the following question: what kind of specimen size is optimal to determine hydrogen content? An optimal specimen size was estimated using a calculation method. Experimental and calculation results obtained by using specimens with estimated dimensions were compared to the results obtained by using the specimen with dimensions of 100*25*8 mm to determine hydrogen content in a deposited metal.

scholarly journals Determination of moisture resistance of covered electrodes according to PN-EN ISO 14372

2019 ◽  
Vol 91 (7) ◽  
pp. 23-30
Author(s):  
Katarzyna Mielnicka ◽  
Adrian Wolski ◽  
Aleksandra Świerczyńska ◽  
Grzegorz Rogalski ◽  
Dariusz Fydrych
Keyword(s):  
Weld Metal ◽  
Hydrogen Content ◽  
Welded Joints ◽  
Test Stand ◽  
Moisture Resistance ◽  
Diffusible Hydrogen ◽  
Indirect Determination ◽  
Deposited Metal ◽  
Covered Electrodes

Moisture present in the electrode covering is one of the sources of diffusible hydrogen in welded joints. In order to study the diffusible hydrogen content in deposited metal, a stand for moisturizing covered electrodes, in accordance with the PN-EN ISO 14372 standard, was built. After the stand was completed, a test of moisturizing the electrodes was carried out and measurements of the diffusible hydrogen content in deposited metal using the mercury method (according to PN-EN ISO 3690) were conducted. The research was aimed at verifying the correctness of the operation of test stand and indirect determination of the influence of storage of rutile-cellulose and cellulose electrodes under fixed conditions on the degree of moisturizing of the weld metal. Both tested electrode grades belong to the group of electrodes with a standard covering.

scholarly journals The determination of the critical parameters of a gasoline petroleum fractionSB-180 Trinity-Anastasievskoe oil

2019 ◽  
Vol 135 ◽  
pp. 01106
Author(s):  
Mikhail Chebotarev ◽  
Pavel Kharchenko
Keyword(s):  
Critical Point ◽  
Calculation Method ◽  
The State ◽  
Experimental Results ◽  
Critical Parameters ◽  
Calculation Error ◽  
Thermodynamic Similarity ◽  
Density Calculation ◽  
Oil Fraction

The article determines the critical parameters of the oil fraction-temperature, pressure and density. The experimental results are compared with the calculated results, the calculation method closest to the experimental results is chosen, the calculation error is estimated. The main results and conclusions are presented. The use of the theory of thermodynamic similarity in the method of density calculation and DNP required first of all knowledge of the parameters of the state at the critical point. The accuracy of the calculation of critical parameters affects the reliability of the results.

scholarly journals DIFFUSIBLE HYDROGEN CONTENT IN DEPOSITED METAL OF MULTILAYER WELDED JOINTS

2014 ◽  
Vol 40 (4) ◽  
pp. 221 ◽  
Author(s):  
Dariusz Fydrych ◽  
Aleksandra Świerczyńska ◽  
Grzegorz Rogalski
Keyword(s):  
Hydrogen Content ◽  
Welded Joints ◽  
Diffusible Hydrogen ◽  
Deposited Metal

Study on Calculation Method of Press Straightening Stroke Based on Straightening Process Model

2007 ◽  
Vol 340-341 ◽  
pp. 1345-1350 ◽  
Author(s):  
Jun Li ◽  
Guo Liang Xiong
Keyword(s):  
Curve Fitting ◽  
Calculation Method ◽  
Process Model ◽  
Experimental Results ◽  
Initial Deflection ◽  
Initial Curvature ◽  
Curvature Equation ◽  
Fitting Method ◽  
Calculation Results ◽  
Curve Fitting Method

It is difficult to determine straightening stroke precisely for automatic straightening machines. The existing calculation method of straightening stroke is based on straightening curvature equation. Because the initial curvature is obtained by curve fitting method, the method is inconvenient to use and its accuracy is not well. In this paper, a method to calculate straightening stroke based on straightening process model is put forward. So the mathematic load-deflection model of straightening process must be established at first. The straightening process model for shafts is developed according to the elastic-plastic mechanics theory. By using the model, the straightening stroke can be calculated directly according to the initial deflection of the bent part. It is advantageous to use and to decrease errors. Comparing with FEM results and experimental results, the calculation results by the model are exact and the errors are small. So the validity and the accuracy of the method are verified. It will be helpful to the development of automatic straightening machines.

scholarly journals Effect of Electrode Waterproof Coating on Quality of Underwater Wet Welded Joints

Materials ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 2947 ◽  
Author(s):  
Jacek Tomków ◽  
Dariusz Fydrych ◽  
Kamil Wilk
Keyword(s):  
Hydrogen Content ◽  
Welded Joints ◽  
High Strength ◽  
Industrial Applications ◽  
Cold Cracking ◽  
Diffusible Hydrogen ◽  
Deposited Metal ◽  
Covered Electrodes ◽  
Steel Joints

In this paper, the effects of different hydrophobic coatings on the surface of covered electrodes on the quality of wet welded carbon steel joints were discussed. Commonly available hydrophobic substances used in industrial applications were selected for the research. The aim of using waterproof coatings was to check the possibility to decreasing the susceptibility of high-strength low-alloy S460N steel to cold cracking. During experiments diffusible hydrogen content in deposited metal determination by mercury method, metallographic macro- and microscopic testing and hardness measurements were performed. Investigations showed that waterproof coatings laid on covered electrodes can improve the quality of wet welded joints, by decreasing the Vickers HV10 hardness in heat-affected zone and decreasing the diffusible hydrogen content in deposited metal, which minimalize possibility of cold cracking.

Contribution to the research and development of radiation chambers in steam reforming

1989 ◽  
Vol 54 (9) ◽  
pp. 2357-2374 ◽  
Author(s):  
Petr Stehlík ◽  
Jan Šika ◽  
Ladislav Bébar ◽  
Luboš Raus
Keyword(s):  
Heat Transfer ◽  
Mathematical Model ◽  
Steam Reforming ◽  
Flue Gas ◽  
Calculation Method ◽  
Zonal Method ◽  
Calculation Results ◽  
The Mathematical Model ◽  
Production Of Ammonia

The mathematical model for investigation of combined heat transfer in the steam reforming radiation chamber with the application of zonal method, its development and final feature is discussed. The calculation results of the steam reforming radiation chamber unit generating syngas for the production of ammonia with the capacity of 1 000 t/day are confronted with the values measured on this unit. Also described is the effect of flue gas mixing on the characteristics of steam reforming process and application of the calculation method for the determination of life of reactor tubes in the field of creep.

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