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	Journal "Svarochnoe Proizvodstvo"	ISSN 0491-6441
	Contents (�07 2017)
to russian

SCIENTIFIC-TECHNICAL SECTION

Belyaev �. I. � Determination of the optimum preheating temperature at deposition of hypereutectoid steels

The results of studies to determine the optimal preheat temperature hypereutectoid steels prior to surfacing with the aim of increasing the strength of the deposited layer and its wear resistance.
Key words: hypereutectoid steel, facing, proprietarily heating, prevalent carbon, strength

Melnikov P. V., Startsev V. N., Gezha V. V., Markova Yu. M. � The formation features of welded joints at vertical laser-arc welding of low-alloy steels

In this article, the technology features of vertical laser-arc welding of large-sized structures made of high-strength low-alloy steel with alternating gap with large root face are considered. The regime parameters of vertical laser-arc welding of the root run of low-alloy steel 30�40 mm thick with 10 mm root face (welding speed, amplitude and frequency of transverse oscillations, welding current, arc voltage, laser power) enabling to formation of a quality welded joint are established. It is established that the laser radiation power required to ensure through fusion penetration of root face depends on the thickness of the base metal: for a metal thickness of 14�30 mm, 3,8 kW is sufficient, for a thickness of 40 mm, not less than 4,6 kW for fusion penetration to a depth of 5 mm. Welded joints have a finely dispersed needle structure of a martensitic-bainite type. The results obtained allow to create a welding technology for low-alloy steels with various thicknesses through the use of robotics means.
Key words: laser-arc welding, hybrid welding, LS-10, microstructure, needle structures, high-strength steel, welding in protective gas

Pushkin M. S., Inozemtsev A. V., Grinberg B. A., Patselov A. M., Ivanov M. A., Slautin O. V., Besshaposhnikov Yu. P. � The relief of the interface during explosion welding of homogeneous materials

The paper studied the microstructure evolution of the separation surface in case of an intensified explosive welding mode for copper � cupronickel joints simulating the homogenous copper � copper pair. Typical structures of wavy separation surface were obtained. Comparison was carried out with the features of the separation surface relief for such joints as Cu-Ta, Cu-Ti and titanium � orthorhombic titan aluminide. Some nonuniformities are observed on the separation surface: cusps, local melted zones, groups of cusps that make the separation surface imperfect, leading to its ramification, intersection and merging of strips. Near the flat separation surface (slightly above it), a quasiwave surface has been discovered that contains sections of bands and nearly round islands that used to belong to the bands. As regards the copper � cupronickel joints, some large-scale unfinished rotations (macro-rotations) in the solid phase were observed.
Key words: explosive welding, interface, cusps, local melted zones, quasiwave interface

Lukin V. I., Betsofen S. Ya., Panteleev M. D., Dolgova M. I. � Influence of the thermodeformation cycle of the FSW on the structure formation of the welded joint of the B-1469 alloy

The phase composition research of the welded joint various zones of a high-strength aluminum-lithium alloy V-1469 obtained by friction stir welding (FSW) was carried out. As the researches result, it was found that quantitative phase analysis is sensitive to structural features at FSW. It is established that in the transition region between the zones of thermomechanical and thermal influence, the effect of reducing the hardness is due to a reduced content of the T1 phase, which is the most effective reinforcer for this alloy.
Key words: welded joint, aluminum-lithium alloy, friction stir welding, zone of thermomechanical influence

Kopaev B. V., Andreeva L. P. � The plastic deformation investigation of the overlap joint from low-carbon steel brazed by tin

The plastic shear deformation in a brazed seam of a overlap joint from low-carbon steel St3 was studied experimentally by the grid method. It is established that the distribution of plastic deformation in a brazed seam depends on the length of the overlap. The obtained regularities of the plastic deformation distribution are observed in soldered joints with a thickness of 0,8 � 0,8; 4 + 4 mm and 0,8 + 4 mm.
Key words: low-carbon steel, soldered overlap joint, tin solder, grid method, shear deformation in seam, distribution of plastic deformation, concept of plastic deformation

PRODUCTION SECTION

Kozyrev N. �., Kibko N. V., Umanskiy �. �., Titov D �., Sokolov P. D. � Improving the quality of the rolling rolls layer deposit by improving the composition of flux-cored wires

An experimental investigation were carried out for the influence elucidating of the alloying with systems C-Si-Mn-Cr-W-V and C-Si-Mn-Cr-V-Mo added to flux-cored wires used for welding deposit of the carbon-fluorine additive (metallurgical production waste) and powdered nickel on rolls. It is shown that the introduction of the indicated materials in the charge composition used for the manufacture of wires marks 35V9�3�F and 25�5F�� promotes helps to improve a number of the deposited layer characteristics: reducing of the pollution level with non-metallic inclusions; increasing of the deposited layer surface hardness; crushing of the austenite grain and the formation of fine-dispersed carbides. In practice this may promotes increasing of the rolls thermal steadfastness of the rolls and the ferrite mesh elimination that can have a positive effect on the fracture strength. The conducted studies allowed developing of new, flux-cored wires composition for rolls welding deposit, protected through the RF patents. Flux-cored wires composition for rolls welding deposit. Technology of the rolls welding deposit through the use of the proposed flux-cored wires with alloying systems C-Si-Mn-Cr-W-V and C-Si-Mn-Cr-V-Mo is introduced into production by Ltd "ElSib".
Key words: flux-cored wirse, welding deposit, microstructure, non-metallic inclusions, austenite, carbides, hardness

Yudin V. M., Shipovalov A. N., Khrapkov G. A. � The worn parts restoration by deposition

In the article, the work experience of Tekhnoplazma Ltd. considering recovery of worn parts of cars and other machines by fusion is outlined. The information of plasma fusion recovery of engine crankshafts and camshafts is presented. The structure and rigidity of fused metal are described. The lifetime evaluation of fusion-recovered parts is given.
Key words: plasma, fusion, coating, part recovery, powder alloys, structure, rigidity, crankshaft, camshaft, crankpin, cam

Koshelev �. �., Mykhina I. Yu., Smykov A. F. � Elimination of casting defects in products from magnesium alloys by the argon-arc welding method

The technology of casting defects elimination in details from magnetic alloys through the use of argon-arc welding is described. Technological methods for preparing the defect spot for welding and the application of filler materials are adduced.
Key words: foundry defect, argon arc welding, magnesium alloys, filler material

Dedyukh R. I., Kiselev A. S., Gordynets A. S. � Shunting the current of a plasma arc during plasma-arc welding with a consumable electrode

Features of the arc plasma current shunting for plasma-arc welding with consumable electrode were considered. The influence of the consumable electrode diameter, the visible electrode extension and plasma arc welding current on the shunting current magnitude were determined. The current shunting effect on the process of the electrode metal transfer and the production rate of electrode melting were demonstrated.
Key words: hybrid technology, plasma-arc welding, consumable electrode, current shunting plasma, drop metal transfer, welding rate, production rate of electrode melting

Shneepson V. Ya. � Some features of the layer formation at the fusion penetration of inclined plates by an electron beam

The paper determines certain peculiarities of formation of a penetrated sheet plates from low carbon steel, aluminum and titanium with an electronic beam, with continuous changing of distance between the focal plane and the specimen plane. It is demonstrated that the results obtained correspond to the main peculiarities of a layer formation when penetrating plates with plasma arc. However, continuous changing of the distance causes transiency of the melting process, continuous change of thermal efficiency of the process, change of the penetrated layer geometric characteristics, and transformation of the layer formation modes from the normal formation mode to the mode of periodic burn through formation.
Key words: penetrating plates with an electronic beam, layer formation, periodic burns through, wave structures

Petrov S. Yu. � Analysis of terms and definitions used in welding State standarts. Terms: welded joint, zone of influence and its constituent parts

Terms are considered � welded joint, zone of thermal influence, zone of mechanical influence and zone of influence. Proposals are made to correct existing definitions.
Key words: welded joint, terms and definitions, zone of thermal influence, zone of mechanical influence

INFORMATION

Korotkov V. A. � The conference "Welding of the Urals" � 50 years

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