PATON B.E., BULATSEV A.R., GAVRISH S.S., ZAGREBELNY A.A.,
PAVLOVA S.V. and SHULYM V.F. Welding technologies under extreme
conditions. Part 2.
Degree of risk and possibilities for risk mitigation.
Results of basic tests conducted to
verify and establish safety of the "Universal" hardware in performing
welding operations under the open space conditions and the possibilities
of reducing the degree of risk are considered. |  2 |
MARKASHOVA L.I., DOBRUSHIN L.D., ARSENYUK V.V.
Improvement of weldability of high-strength aluminium alloys in
explosion cladding.
Peculiarities of plastic deformation
and process of hardening in the zone of the joints on commercially pure
aluminium AD1 and annealed aluminium alloy 1201AM, explosion welded to
high-strength aluminium alloy of the 1201AT type, are considered. To
increase the safety factor for ductility of the deformed layers and
improve weldability in cladding high-strength aluminium by the explosion
welding method, it is recommended to soften the mating surfaces by
preliminarily chemically cleaning them from hardening phases. | 12 |
KOROTYNSKY A.E.,MAKHLIN N.M.,BOGDANOVSKY V.A.
About design of electronic controllers of welding current for
multistation welding systems.
It is shown that the main drawback
of multistation systems based on ballast rheostats, consisting in
increased energy consumption, can be prevented in their replacement by
electronic controllers of welding current made on power transistor
switches of the third and fourth generations. These schemes are based on
welding current coverters using pulse-width modulators with wide
functional capabilities of welding-technological properties.
| 16 |
| ISHCHENKO A.YA. Investigation and development of the
technology of light alloy welding at the PWI.
| 25 |
DOVBISHCHENKO I.V. and STEBLOVSKY B.A. Development of
methods for arc welding of aluminium
and its alloys.
History of development and upgrading
of methods and technologies for arc welding of aluminium and its alloys by
the Department for Physical-Metallurgical Processes of Welding Light
Metals and Alloys at the E.O. Paton Electric Welding Institute is
described. The role of the Institute in mastering the technologies for
welding specific parts is noted.
| 27 |
VOROPAJ N.M. Distribution of rate and pressure of
plasma flows in welding arcs.
Radial and axial distribution of
gas-dynamic characteristics of plasma flows in welding arcs has been
studied. Arc column shape was approximated in the form of a truncated cone
of a height, equal to arc length, and radii of upper and lower bases
determined as corresponding sizes of a luminous region on the arc filming
frames. Comparison of calculated data with available experimental data
showed a satisfactory correlation of results obtained for the rate and
pressure of plasma flows in definite welding arcs.
| 31 |
ISHCHENKO A.YA., DOVBISHCHENKO I.V., MASHIN V.S. and
PASHULYA M.P. Features of consumable-electrode arc welding of
aluminium alloys in neon and its mixtures
with helium and argon.
Volt-ampere characteristics of the
steady and impulse arc in mixtures of different inert gases and features
of weld formation and geometry are analyzed. A fundamental possibility and
cost-effectiveness of application of helium-neon mixtures for protection
of the welding zone is demonstrated.
| 35 |
POKLYATSKY A.G., LOZOVSKAYA A.V. and GRINYUK A.A.
Prevention of formation of oxide films in welds on Li-containing
aluminium alloys.
Effect of different technological factors on formation
of extended filamentary inclusions of oxide films in TIG welds on
Li-containing aluminium alloys is considered. It is suggested that these
defects are caused primarily by a higher melting temperature of filler
metal, compared with base metal. Recommendations allowing production of
quality welded joints on Li-containing aluminium alloys are
given.
| 39 |
SKORINA N.V. and MASHIN V.S. Coated electrodes of
UANA grade for welding and surfacing aluminium and its alloys.
The paper gives the characteristics
and some features of the technology of manufacturing coated electrodes for
manual arc welding of aluminium and its alloys, developed at the PWI. The
need is shown for completion of chemical reactions, proceeding in
preparation of the coating mass to stabilize it during extrusion. The
optimal temperature of electrode baking is established, which provides a
low susceptibility of coatings to absorption of atmospheric
moisture. | 43 |
VOROPAJ N.M. and MISHENKOV V.A. Combined method for
plasma and arc welding using different-polarity current pulses
(Hidra-process).
The process of combined plasma and
arc welding of aluminium alloys 10-30 mm thick was developed. The process
provides for feeding pulses of current (reverse polarity) to the first and
third tungsten electrodes as welding progresses, and, in the intervals
between them, pulses of current (straight polarity) to the central
plasmatron. Design of the device for realisation of the process and its
technological capabilities are given.
| 46 |
TARARYCHKIN I.A. Method of determination of
corrective actions in statistical control of welding processes.
Procedure of a simultaneous
construction of charts of control of condition and relative accuracy for
defining corrective actions directed to the recovery of a disturbed
accuracy of the technological process is offered. Procedure capabilities
are shown on example of making a circumferential weld using technology of
narrow-gap arc welding.
| 48 |
KHORUNOV V.F., SABADASH O.M., MAKSIMOVA S.V. and STEFANIV
B.V. Dispersion-strengthened heat-resistant solder.
Methods for production, properties
and microstructure of dispersion-strengthened solder Sn-39Pb were studied.
Short-time strength of soldered joints made by using the
dispersion-strengthened solder, depending upon the content of the
strengthening phase, was evaluated.
| 50 |
Index of articles for TPWJ'2002, No. 1-12.
| 53 |
List of authors.
| 59 |
English
