Decomposition of the USSR and
emergence of independent republics
in the post-Soviet space
at the start of 1990s was accompanied
by upsetting of industry
operation, breaking up and loss
of production links, mass stoppage of production.
In 1993 in Kiev a joint Russian-Ukrainian Company
«TM VeldTek Ltd.» was set up by the initiative
of PWI staff. The Company was successfully
developing in the direction of flux-cored
wire manufacture. This was promoted by the support
of «Dnepropetrovsk Hardware Production
Association», where the management appreciated
the idea of restoring flux-cored wire manufacturing
in Ukraine.
In 2001 flux-cored wire manufacturing was
moved to a separate subdivision –
«TM.WELTEC Ltd.».
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Over 25 years of operation the Company implemented
a number of important engineering
measures on repair and upgrading of the main
equipment, in particular, flux-cored wire production
lines, charge section improvement, has mastered
modern forms of product supply, has optimized
technologies of manufacturing wires of
1.0—6.0 mm diameter. Series of modern welding
and surfacing flux-cored wires have been developed
and are manufactured at present. Such results
have been achieved owing to dedicated efforts
of highly qualified engineering and technical
staff and workers.
Positive result of cooperation with enterprises
is achieved owing to application of comprehensive
approaches to order fulfillment, including,
if required consultative assistance on selection of
material, optimum technology and equipment for
its application and engineering support.
High scientific and technical potential of the
Company, irrespective of the range and volume
of batches, allows fulfilling the orders in the
shortest time, taking into account customer requirements.
Such an approach allowed occupying
a quite large market segment in Ukraine, ensuring
stable foreign contacts and becoming a firm partner
for many enterprises. Experience of interaction
and cooperation with research institutes and
universities of Ukraine and Russia is to the company’s
credit.
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By their applications and performance
WELTEK wires now are not inferior to the products
of leading foreign companies, that is confirmed
by their high evaluation in the local and
foreign exhibitions and independent ratings,
company’s recognition as a reliable supplier by
leading enterprises of Ukraine and CIS, continuous
widening of consumption regions and growth
of sales.
«TM.WELTEC» developed a number of new
flux-cored wires for building-up by surfacing.
WELTEK-N470 flux-cored wire of 2.0—4.0 mm
diameter in combination with fluxes AN-20 and
AN-26 and WELTEC-H470S self-shielded wire of
2.0—2.4 mm diameter are manufactured for building-up
by welding of CCM rolls. These wires
ensure self-separation of slag crust, absence of
pores or cracks in the deposited metal in case of
following the technological recommendations.
Comparative testing of WELTEC-H470 and
WELTEC-H350-RM wires showed that they are on
the level of those of leading foreign companies.
Built-up rolls have the service life of not less
than 1.5 mln t.
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«TM.WELTEC» together with metallurgical
plants «Krivorozhstal», «Dneprovsky F.E. Dzerzhinsky»
and «Zaporozhstal» performed a package
of work aimed at improvement of surfacing
consumables, technology and equipment for mill
roll surfacing. Standard flux-cored wires of FCW-Sw-35W9Cr3SiVand FCW-Sw-25Cr5VMoSi grades
were used to optimize the alloying systems and
develop new flux-cored wires WELTEK, allowing
for mill roll operating conditions, namely WELTEC-H370-RM, WELTEC-H460, WELTEC-H500-RM, WELTEC-H505-RM, WELTEC-H550-RM. Surfacing
by these wires is performed using AN-20,
AN-26 and AN-348-A fluxes. Application of the
proposed wires improved the effectiveness of mill
roll operation.
In cooperation with Nikopol Plant of Seamless
Pipes «Niko Tube» performed work on introduction
of hardsurfacing of continuous mill rolls by
WELTEC-H350-RM flux-cored wire with C—Si—Mn—Cr—V—Mo—W alloying system. The wire
provides a stable process of DCRP surfacing using
AN-20S and AN-26P fluxes, easy separation
of slag crust, absence of cracks and pores in the
deposited metal. Deposited metal hardness is
HRC 50—56.
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Self-shielded flux-cored wire WELTEC-H250-RMof 1.6—3.0 mm diameter is successfully
applied at reconditioning of mill stand and shear
pads, spindels and couplings of roll drives,
sprockets, bushings, shafts, hubs, etc.
Surfacing of dogging crane cores and striper
crane jaws, exposed to impact and compressive
loads at high temperatures in service, was implemented.
For this purpose, 2.0 mm self-shielded
flux-cored wire of WELTEC-H480S grade with
C—Cr—W—Mo—V—Ti alloying system was applied,
which ensures deposited metal hardness
after surfacing equal to HRC 50—54, and hot
hardness of HRC 40—44 at 600 °C. Application
of mechanized surfacing with WELTEC-H480Swire instead of T-590 and T-620 electrodes allowed
extending core service life 4—5 times. The
problem of core reconditioning was solved in a
comprehensive manner (equipment—material—technology).
Flux-cored wires of WELTEC-H350-RM and
WELTEC-H350-RM grades of 1.6—4.0 mm diameter
are proposed for crane wheel surfacing. Surfacing
is performed with AN-348 and AN-60
fluxes or in CO2. Over the recent years WELTEC-H300-RMwire has been successfully applied instead
of solid wire Np-30KhGSA. Technology of
surfacing using AN-348 flux and 3.6 mm fluxcored
wire of WELTEC-H285 grade has been developed
for heavy-duty crane wheels. Chromiummanganese
deposited metal with the structure of
metastable austenite ensures high wear resistance
of the wheels through development of the process
of self-strengthening at cold working.
The Company is taking an active social stand,
providing financial support to local sports, medicine
and science.
