Thermal Spray
HVOF Coating
Wear and erosion protection with high-performance systems such as WC-CoCr, WC-Co and Cr₃C₂-NiCr.
Learn More →Surface Engineering · Repair · Remanufacturing
Restore Worn Parts.
Put Critical Equipment Back into Service.
We combine HVOF, PTA, arc spray, weld restoration, machining and precision grinding in a single engineering workflow. We analyse the wear mechanism, select the right material system and bring the part back to its target dimensions.
4,500+Completed projects
ISO 9001:2015Quality management system
1,800 m²Ankara site area
1,100 m²Covered production area
HVOFPTAARC SPRAYHARDFACINGGRINDING
Company Film
Get to Know UMEK on Film
HVOF, PTA, arc spray, remanufacturing and precision grinding: a short film covering the whole process, from the part's damage mechanism to its final dimensions.
What Is Your Problem?
We Match Surface Damage to the Right Mechanism
Rather than forcing a technology onto the part, we select the process according to wear, impact, temperature, corrosion and tolerance requirements.
01
Wear
Material loss caused by abrasion, adhesion and high contact loads.
02Erosion
Surface loss caused by particles, slurry or high-velocity flow.
03Corrosion
Surfaces attacked by chemical media, temperature and wear acting together.
04Dimensional Loss
Dimensional restoration of shafts, bearing seats, seal areas and critical geometries.
Solutions
Not a Single Process, but the Right Combination of Processes
By combining coating, welding, machining and grinding within one project, we don't just coat the part; we make it reusable.
Hardfacing
PTA Weld Overlay
Thick, metallurgically bonded hardfacing solutions with NiCrBSi, Stellite and tungsten carbide composites.
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Large Area Protection
Arc Spray
Fast metallic spray solutions for boilers, large surfaces and dimensional restoration.
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Repair & Manufacturing
Remanufacturing
Remanufacturing of critical parts through reverse engineering, weld restoration, machining and precision grinding.
Learn More →Why UMEK?
More Than a Coating Shop
Every project is planned by evaluating the part's operating conditions, wear mechanism, base material and final dimensional requirements together.
About UMEK01
Engineering Approach
Process and material are selected according to operating conditions.
02
Single-Site Production
Coating, welding, machining and grinding in one project workflow.
03
Multiple Technologies
HVOF, PTA, arc spray and weld restoration options.
04
Dimensional Control
Post-coating machining focused on final tolerance and surface quality.
05
We Build Our Own Equipment
We manufacture our twin wire arc spray power unit in our own workshop.
06
Parts up to 7 m
7 m robotic coating travel; long shafts and cylinders can be coated in one piece.
Real Applications
Selected Projects from Different Industries
See our solution approach across industries through real part photos and application-focused process information.
Hydropower
Francis Turbine Runner Restoration
Geometry restoration and surface engineering on turbine surfaces exposed to erosion and cavitation.
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Energy / CFB
CFB Boiler Tube Protection
Arc spray based on-site protection system for boiler tubes exposed to erosion.
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Galvanising
Sink Roll HVOF
Restoration of a roll operating in molten zinc with WC-CoCr coating and final machining.
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Recycling
FORREC Bag Opener
Weld restoration of shaft and blade geometries and renewal of wear zones with hardfacing.
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Wood / MDF
Refiner Feed Screw
Profile restoration of worn screw flights and hardfacing tailored to the working zone.
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Oil & Gas
PDC Bit Repair
Drilling tool repair to prepare the body and insert areas for return to service.
View Project →Production Capability
A Real Facility, Measurable Capacity
From robotic coating to final grinding, we manage critical operations at our Ankara facility.
7 mRobotic coating travel
Ø1,250 mmMachining diameter capacity
4 mMachining length
8 AxesRobot + linear axis + positioner
HVOF Cell
DJ2700-based HVOF processes with robotic part handling.
PTA Hardfacing
Automated hardfacing and wear surface renewal.
Arc Spray
Metallic spray infrastructure suited to both workshop and on-site applications.
Machining & Grinding
Post-coating control of final dimensions, tolerances and surface roughness.
Quality Assurance
Applying a Coating Isn't Enough. It Has to Be Measured.
The inspection plan is defined by project requirements. Dimensional inspection, coating thickness, hardness, surface roughness and microstructure evaluation are all part of the production flow.
Surface preparationCoating thicknessHardness testingSurface roughnessFinal measurementMicrostructure / metallographyProject documentationISO 9001:2015
Reverse Engineering & Remanufacturing
OEM Lead Times Too Long?
We measure and re-model critical parts that have no drawings, are no longer manufactured or come with long lead times, and where appropriate we upgrade their wear zones with coating or hardfacing systems tailored to the operating conditions.
Industries
We Assess Each Part in Its Own Operating Environment
Oil, Gas & DrillingPDC · Stabilizer · Downhole Tools
Power & BoilersCFB · Recovery Boiler · Tube Protection
Galvanising LinesSink Roll · Stabilizer Roll
HydropowerFrancis · Pelton · Shafts
Wood, MDF & PanelRefiner · Chipper · Press Components
RecyclingShredder · Bag Opener · Wear Parts
MiningCrusher · Screws · Wear Components
Cement & MineralsCrusher · Mixer · Fan
Iron & SteelRolls · Shafts · Furnace Components
Pulp & PaperRecovery Boiler · Rolls · Fans
Chemicals & PetrochemicalsPumps · Valves · Shafts
General Machinery & OEMReverse Engineering · Remanufacturing
Selected Customers
Selected Companies We Have Served
We provide surface engineering, repair and remanufacturing services to global and local manufacturers across a range of industries.
ANDRITZBaker HughesKochendörferTosyalıTAQATPAOViking InternationalFocus
Technical Knowledge Center
Real Engineering Questions Before You Buy
We answer the technical questions maintenance and purchasing teams ask most often when selecting a process, with tables and decision criteria.
Process Selection
PTA or Laser Cladding?
Real selection criteria for heavy industry, thick overlays, impact and cost.
Process EconomicsIs Laser Always Necessary?
Where do MIG/MAG, PTA and laser cladding really offer an advantage?
HVOF MaterialsCr₃C₂-NiCr or WC-CoCr?
Selection by temperature, wear and corrosion conditions.
Co-baseStellite 6, 12 and 21
The right alloy for wear, impact, galling and temperature.
Ni-baseHow to Select an Inconel Alloy
625, 617 and 718 are not used for the same purpose.
ComparisonThe Difference Between HVOF and PTA
Selection by bonding mechanism, thickness and use case.
MaterialsWC-Co vs WC-CoCr
Selecting a carbide system for wear and corrosion conditions.
Final MachiningGrinding After Coating
Tolerance, roughness and functional surface requirements.
Frequently Asked Questions
Short Answers on Coatings and Services
What is tungsten carbide coating and which parts is it used on?
Tungsten carbide (WC-Co) coating is applied to a part's surface by thermal spraying (HVOF) and provides very high hardness and wear resistance. It is used on drilling equipment, PDC bit bodies, pump shafts, valve sealing surfaces, hydraulic cylinders and all kinds of industrial parts in contact with abrasive media.
What is the difference between HVOF and arc spray coating?
HVOF (High Velocity Oxygen Fuel) sprays powdered alloy at very high velocity and relatively controlled temperature, producing a dense, low-porosity coating; it is the preferred method for high-performance alloys such as tungsten carbide. Arc spray melts metal with an arc struck between two wire electrodes and sprays it; it is faster and more economical, and suited to dimensional repair of large surfaces and moderate wear/corrosion protection.
When is PTA weld overlay (hardfacing) the preferred choice?
PTA (Plasma Transferred Arc) is preferred where much thicker layers than thermal spray can provide are needed (typically 2-8 mm), together with a low-dilution bond that is metallurgically fused to the base material. It is used for build-up and repair of valve seating surfaces, cutting equipment and large-diameter shafts exposed to heavy impact and wear.
Does UMEK provide repair, maintenance and overhaul services for worn parts?
Yes. UMEK's core business is the repair, maintenance, overhaul and refurbishment of worn or damaged industrial parts by hardfacing, weld overlay and thermal spray. In addition to work carried out at our facility, our field team performs on-site overhauls of large equipment such as kilns and ball mills.
Which industries does UMEK serve?
UMEK provides surface coating and welding services to hydropower plants (Pelton/Francis turbine components), oil & gas (drilling equipment, PDC bits, pipeline equipment), mining, iron and steel (rolling mill rolls), power generation, recycling and the paper/packaging industries.
How are coating thickness and final tolerance determined?
Final thickness is determined by engineering calculation according to the part's operating conditions (type of wear, impact, corrosive environment); the grinding allowance is taken into account and the required tolerance is achieved by CNC grinding after coating. In typical applications the grinding allowance ranges from 100 to 500 microns, and it is calculated part by part at the quotation stage.
How quickly will I receive a response to a quotation request?
Once complete technical drawings or sample part information have been received, a quotation including price and delivery time is usually prepared within 24-48 hours for standard applications. For complex projects or those requiring new development, this may take longer to allow for engineering evaluation.
Technical Assessment
Let's Define the Right Solution for Your Part Together
Send us a photo or technical drawing. Our technical team will assess the operating conditions and recommend the appropriate process and material system.