e11

	Journal "Svarochnoe Proizvodstvo"	ISSN 0491-6441
	Contents (�11 2018)
to russian

SCIENTIFIC-TECHNICAL SECTION

Makarov G. I., Kapustin �. �. � Experimental evaluation of the stressstrain state of welded pipelines by using electrical resistance sensors and analog-to-digital converters

In the article the main propositions of the methodology for the experimental evaluation of stress and strain values in welded pipelines by using electrical resistance sensors are stated. A description of the test stand, electronic devices for digitizing analog signals and a computer program for processing the measurement results is adduced. The results of the experimental evaluation of the stress-strain state of a welded pressure vessel with structural features (with repair structures of various types) are introduced.
Key words: welded structures, pipelines, repair structures, experimental evaluation of stresses and deformations, electrical resistance sensors, analog-to-digital converters

Zorin I. V., Elsukov S. K., Sokolov G. N., Dubtsov Yu. N., Lysak V. I., Kharlamov V. O. � Investigation of the alloy Inconel 625 deposition process by a split electrode

The features of the arc existence on a split electrode during deposition are investigated, and the stability of the welding arc existence under fluxes based on various slag systems is estimated. The relationship between the coefficients of the transition to the deposited metal of the alloying elements and the characteristics of the stable existence of the welding arc during deposition on the straight line and reverse polarity is shown. The values range of the slope angle of the split electrode is established, at which a qualitative formation of the deposited metal is ensured with a minimum share of the base metal in it.
Key words: split electrode, welding arc, deposition, flux, alloying elements, forward and reverse polarity

Efimenko N. G., Bartash S. N., Sitnikov P. A. � Metal cold resistance of the low-alloy steels welding joint, micro-alloyed REM

The effect of rare earth metals (REM), introduced into the electrode coating, on the mechanical properties, chemical composition and impact toughness at test temperatures from +20 to �70 �C deposited metal and metal of welding joint on steel 10�SND was studied. The components of fracture under impact tests are determined: the work of crack initiation (KST3) and work of fracture (KSTr). The character of the fracture surface of the damaged samples is studied. There is an increase in the impact toughness of a metal, micro-alloyed REM, in the investigated temperature range of the tests.
Key words: rare earth metals, electrode coating, mechanical properties, impact toughness, welding joint metal, crack nucleation work, microalloying

PRODUCTION SECTION

Abrosin �. �., Khodakov V. D., Pevkin P. S., Nikitin V. B. � Research and development of the manufacturing technology of the low-speed turbines welded rotors for high-capacity nuclear power HCNP plants (VVER-1200)

The results of research of basic and welding materials are adduced. The rotor of a slow-moving turbine for HCNP manufactured using the developed complex technology is developed and put into operation. New welding materials, argon arc welding of root seams and automatic welding under the flux of the main joints in the slotted section are recommended; a thermal cycle for manufacturing welded rotors, including heating during welding, thermal waste and final heat treatment is indicated.
Key words: welding material, argon arc welding, automatic submerged arc welding, slotting groove, root seam, main seam, thermal cycle

Shatov �. P. � Methods for protecting corrosion of the inner surface of steel vitrified pipes during welding

In work corrosion problems of welded steel vitrified pipelines and ways of their protection under the action of highly mineral water with hydrogen sulfide (water conduits) of oil-compressor stations are considered. It is established, that in order to eliminate the harmful effect of microalloying by boron of the welding seam, it is recommended to use the mentioned above welded joints of such pipelines as well as their repair.
In view of the presence of a glass coating, it is recommended that extreme safety precautions be taken when installing such pipelines, in order to avoid disruption of the continuity of the glass coating.
Key words: steel pipe inner surface, vitrified, welding, corrosion

Golikov N. I. � Residual stresses at structures welding in conditions of low climatic temperatures

The article considers the theoretical prerequisites for estimating the residual welding stresses in the welding of structures in conditions of low climatic temperatures. It is shown that when welding under conditions of negative temperatures, residual stresses can create additional plastic deformations in the welded joint zones. Produced the estimate degree of possible plastic deformations and the level of stresses arising. Possible ways of reducing the influence of residual stresses on the cold resistance and operational strength of welded joints are given.
Key words: residual welding stresses, plastic deformation, yield strength, cold resistance, stress relaxation

Slinko D. B., Dorokhov A. S., Denisov V. A., Lyalyakin V. P. � The practice of using plasma-powder deposition when restoring worn machine parts

The paper presents the results of experimental studies on the development of technology for the recovery of worn out balancer-caterpillars of tracked vehicles and semi-axes of the steps of the metro escalator by the method of plasma-powder overlaying. Specialized equipment and rigging for the implementation of the plasma-powder surfacing method and subsequent machining of the welded surfaces with respect to these parts has been developed. The marks of filler powders and their ratio have been experimentally established, ensuring a high quality of the deposited layer. Analysis of the structure made it possible to establish the absence of pores and cracks in the deposited layer and the zone of thermal influence.
Key words: balancer, semi-axle of escalator stage, worn surface, plasma-powder surfacing, filler powders, surfacing installation, microhardness

Chavdarov A. V., Lyalyakin V. P. � Automation of welding and deposition processes at the production of agricultural machinery

The paper presents the results of the analysis of the features of automatic welding systems acquisition to perform typical welding operations. Examples of automatic welding machines are given. The analysis of features of creation of the auxiliary welding equipment with the description of the main entering knots for welding and the direction of details like "shaft" and "flat surface" is given.
Key words: automation, welding systems, welding, surfacing

Peshkov V. V., Bulkov A. B., Kolomenskiy A. B., Egorov V. G. � Diffusion-welded titanium thin-walled layered structures

The article analyzes the traditional technologies for manufacturing thin-walled structures made from titanium alloys. Defects of these technologies and possible design defects associated with the type of connection, welding materials or process parameters are indicated. Variants of manufacturing of the considered units by means of diffusion welding are proposed. The results of mechanical tests and fractographic studies of the surfaces of failure of assemblies and structures for substantiate the possibility of using diffusion welding in the preparation of integral joints are presented.
Key words: diffusion welding, titanium alloys, thin-walled structure

ECONOMIC AND PRODUCTION ORGANIZATION

Frolov V. A., Pilipenko B. G., Putyatina L. M., Vlasenko A. N., Arseneva N. V. � The importance of welding production monitoring for the strategic development of the machine -building enterprises

The article discusses the current concept of the strategic monitoring of development of welding production in machine-building enterprises. A General classification of monitoring in welding production: technological and socio-economic. The basic aspects of the activities included in each type of monitoring. Reflects the main directions of monitoring, clarifying its holding for the production.
Key words: monitoring of welding production, techno-economic monitoring socio-economic monitoring, and strategy of development of welding production, advanced management solutions

* * *

A. A. Suslov

��: 127015, ��, �/� 65.
��.: +7 (495) 640-7903
e-mail: ic@ic-tm.ru

� 2008-2024, ��
�� - www.itsite.ru