Contents of
the Paton
Welding
Journal
no.8, 2000
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Page
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SCIENTIFIC AND TECHNICAL
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BYKOVSKY O.G., PINKOVSKY I.V. and PATYUPKIN A.V.
IMPROVEMENT OF
CAVITATION-EROSION RESISTANCE OF CLAD PARTS OF HYDRAULIC
MACHINERY
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3
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High-temperature impact on the metal surface in cavitation
erosion has been confirmed. Application of dispersion-hardening
alloys with an unstable structure is recommended for its
elimination. Control of thermal cycle and cladding technique
enables a considerable improvement of the cavitation-erosion
resistance of the deposited metal.
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GAVROV E.V.
COMPOSITE POLYMETALLIC ELECTRODE WIRES
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8
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Results of investigations conducted by the Zaporizhya State
Technical University for over 30 years in the field of
development and practical application of polymetallic wires for
welding, surfacing and metallization of copper alloys of
different alloying systems are presented. General principles of
development of copper-base polymetallic wires which can be
successfully used, upon proper correction, for design and
manufacture of wires for welding, surfacing and metallization of
other alloys are described.
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GUK V.A.
MATERIALS AND TECHNOLOGY FOR SURFACING OF MACHINE PARTS
OPERATING UNDER CONDITIONS OF IMPACT-ABRASIVE WEAR
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11
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Compositions and structures of deposited metal produced using
consumables of different alloying systems were analysed.
Performance of the deposited metal under conditions of
impact-abrasive wear was evaluated. Composition of a new
flux-cored wire ensuring high wear resistance of rotary crusher
beaters is suggested.
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POPOV S.N.
WEAR RESISTANCE OF METAL DEPOSITED ON WORKING PARTS OF
ROAD-BUILDING MACHINES DURING THEIR OPERATION
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14
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Three groups of surfacing alloys characterized by a different
content of the hardening phase are considered. The effect of
phase composition on physical-mechanical, operational and service
properties of alloys is analysed.
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MATVIJSHIN E.M.
DEPOSITION OF LAYERS WITH HIGH ADHESION STRENGTH
BY THE ARC METALLIZATION METHODS
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19
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Composite wires of the Ni<196>Al and Fe<196>Al types with a
nickel or steel sheath are suggested. The wires used for
electric-arc spraying provide coatings with a high strength of
adhesion to the substrate, including to polished surfaces of
parts.
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POPOV V.S., BEREZHNYI S.P., BILONIK I.M. and PIROZHKOVA V.P.
EFFECT OF COMPOSITION OF FERROALLOYS ON THE CONTENT AND SHAPE OF
NON-METALLIC INCLUSIONS IN METAL DEPOSITED WITH ELECTRODES
UONI-13/55
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22
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Effect of additions of ferrotitanium and complex ferroalloy of
the electroslag melting in the coating of basic electrodes of the
UONI-13/55 type on the mechanical properties of the deposited
metal and content of non-metallic inclusions and also impurities
in it was investigated.
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TKACHENKO Yu.M.
EFFECT OF COOLING RATE ON THE STRUCTURE OF
HIGH-CARBON DEPOSITED METAL
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27
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Structure of the chromium deposited metal of 120Kh12F1 type used
in restoration of dies for production of refractories is
examined. It is shown that a ratio of structure
austenite-martensite-carbide constituents in the deposits can be
preset by a rate of metal cooling.
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ALEKSANDROV A.G. and SAVONOV Yu.N.
CORROSION RESISTANCE OF
STAINLESS STEEL WELDED JOINTS IN ALKALI SOLUTIONS (REVIEW)
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29
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Corrosion behaviour of stainless steel welded joints in alkali
solutions in the production of pulp by a kraft-method has been
investigated. The corrosion potential of steels is within the
passive region, the region of an active-passive transition or
near the transpassive region of potentials. Under these
conditions the welded joints are susceptible to a corrosion
cracking, while weld metal is prone to a selective corrosion.
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GORDIENKO V.N. and SHUMILOV A.A.
CLADDING OF DRAUGHT EQUIPMENT
BLADES
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33
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Wear resistance of cladding consumables under gas-abrasive wear
was studied. New cladding consumables in the form of flux-cored
wires and coated electrodes were proposed, namely PP-150Kh12R4,
PP-160Kh14R4MN, PP-80Kh12R3TA, EN-150Kh12R3TA, EN-180Kh14R4.
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PATYUPKIN A.V., RUDYCHEV A.S. and BYKOVSKY O.G.
CAVITATION-CORROSION RESISTANCE OF SOME DEPOSITED STAINLESS
STEELS AND ALLOYS
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37
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Some deposited stainless steels and alloys were tested in the
impact-erosion testing facility. It is found that the corrosion
factor plays the most important role in the process of
cavitation-corrosion fracture of materials in an aggressive
medium.
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VOROPAY N.M. and PROTSENKO P.P.
FEATURES OF WELD AND HAZ
FORMATION IN GAS-SHIELDED PULSED TWIN-ARC WELDING IN
HIGH-STRENGTH LOW-ALLOYED STEELS
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40
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The process of pulsed twin-arc welding is characterized by a
separate feed of current pulses to electrically isolated
consumable electrodes, the arcs of which form the common weld
pool. Studies of the effect of parameters of twin-arc welding on
the penetrating power of the arc, weld formation, sizes of the
HAZ, structure and properties of welded joints in high-strength
low-alloyed steels with improved thermal characteristics are
described.
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LEVCHENKO O.G.
FORMATION OF AEROSOLS IN CO2 MODULATED-CURRENT
WELDING
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47
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It is shown that the method of a modulated-current welding makes
it possible to decrease the intensity of evolution of a hard
constituent of welding aerosols (HCWA) and content of manganese
in it as compared with welding at a continuous current. At the
modulated-current welding these characteristics are determined
not only by a mean power of the arc, but also by a frequency of
impulses.
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BRIEF INFORMATION
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PAKHOLYUK A.P. and KIRILYUK G.A.
STABILITY OF ARC PROCESS IN
WIDE-LAYER SURFACING OF CYLINDER SURFACES
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50
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Dependence of a stable melting of a self-shielding flux-cored
wire for the conditions of a wide-layer surfacing on the
condition parameters is established. A mathematical model is
presented and a procedure of selection of parameters of this
surfacing conditions is suggested.
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MYERS L.W. and LaFLAMME G.
ELECTRON BEAM BRAZE WELDING OF
COMPRESSOR IMPELLERS
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53
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The development of a unique welding process which combines
electron beam welding and brazing in one operation is described
for application to centrifugal compressor impellers. The first
phase of the testing program (reported in this paper) consisted
of welding T-samples to develop welding conditions, axial and
bending fatigue, metallurgical investigation, and hardness
testing. Upon completion of testing, prototype impellers were
fabricated to prove the process on production parts, and these
impellers were also destructively examined after overspeed
testing. All test results have been excellent, and the process is
being used to produce impellers.
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| NEWS |
GRADUATION CEREMONY FOR EUROPEAN WELDING ENGINEERS
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58
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INFORMATION
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62
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ADVERTISING
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65
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