(503) 286-7791INFO@WESTERNMACHINE.COMMON - FRI 7AM - 11PM24/7 Rapid ResponseContact HOME SERVICES INDUSTRIES ABOUT US PROJECTS REQUEST A QUOTE THERMAL SPRAY SERVICES Utilizing a twin-wire arc thermal spray process, worn out equipment and bearing fits are restored to OEM specifications or better. Your critical equipment is repaired, restored, and reconditioned, at less time and cost compared to a full replacement. Our thermal spray technicians make a difference. They are highly skilled with extensive experience in thermal spray coating that meets ASTM standards including ASTM 633-01(2008) and ASTM G98. Our technicians can meet customer’s specifications, combining mastery of thermal spray equipment, material, process, dimensional verifications, and quality checks. There is no shortcut to quality, so our technicians are meticulous in every aspect of the thermal spray process, including masking of the areas to be thermal sprayed, surface preparation, grit blasting, and parameter controls. Thermal Spray Services Combustion Flame Spray Two-Wire Electric Arc Spraying Custom Coatings Traction Coatings WHAT YOU NEED TO KNOW ABOUT THERMAL SPRAYING What is Thermal Spraying? Thermal Spraying is an industrial process which involves the projection or spraying of a coating particle onto a cleaned and prepared surface, using a combined kinetic and thermal energy to provide resistance to wear, erosion, cavitation, corrosion, or abrasion. Thermal spray coating is a mechanical bonding process which uses a variety of spray materials such as steel, nickel alloys, copper, bronzes, ceramics, tungsten carbides, etc. It can be applied at various thicknesses, typically 100-750 microns. Thermal spraying is a tried and tested technique used in various industries to repair and restore worn or damaged components. OUR THERMAL SPRAYING CAPABILITIES Western Machine Works specializes in various types of thermal spraying processes for industrial applications: COMBUSTION FLAME SPRAY Combustion flame spraying is a thermal spray process used to coat substrates that are stress sensitive. In combustion flame spraying, a gaseous fuel source and oxygen are combined to melt the coating compound feed stock. Usually, the coating material takes the form of a fine powder, wire, or rod that is melted at about 4600-4800 °F. The molten particles are propelled to the substrate surface using compressed air at about 80 feet per second. Combustion flame spraying offers several benefits: Advantages Resistant to corrosion, wear, heat and oxidation Substate does not warp or distort Electrical resistivity and conductivity TWO-WIRE ELECTRIC ARC SPRAYING Western Machine Works utilizes the twin-wire arc metal spray process for component restoration. The material deposited is 420 Stainless Steel. This system feeds two wires to the gun. The wires are charged with opposite polarities. When the wires are brought together at the contact point, the opposing charges on the wires create enough heat to continuously melt the tips of the wires. Compressed air is used to atomize the now molten material and accelerate it to the workpiece surface where it is embedded to form the coating. Components are prepared by previously machining to the proper pre-buildup size, then carefully masked and prepared with appropriate grit blasting. Advantages Speed – Restorations using this method can be done in a fraction of the time it takes to brush plate the same fit. Environmental – No hazardous waste products are generated using this process. Flexibility – This process can be used to restore a part requiring as much as .050” per side on a 4” diameter journal. Brush plating is limited to about .010” per side without adding copper as a base material. Proven Serviceability – Thousands of bearing fits have been restored using this process. Proven Reliability – Western Machine has never had a restored bearing fit fail when using this process. Conclusion: A 420 stainless steel thermal spray coating produced using a twin wire arc process improves the galling and fretting resistance of the material. In terms of thickness, oxide content, and porosity level, the coating has a notable amount of variation between samples. However, in all cases coating integrity is good. TABLE 1 — Summary of results for the bond strength test of the 420 stainless steel coating Sample Tensile Strength, PSI Load, lbs Cross-Sectional Area, sq in Mode of Failure 1 5430 4252 0.7830 90% adhesive 2 5085 3978 0.7823 90% adhesive 3 4790 3755 0.7838 90% adhesive Average 5102 – – – Crosshead Speed: 0.04 in./min through fracture; Epoxy: FM1000 Lot #6062-0004; Method(s): ASTM C 633-01 (2008) TABLE 2 — Results for a blank specimen (no coating) Sample Tensile Strength, PSI Load, lbs Bond bar 12,493 9773 Crosshead Speed: 0.04 in./min through fracture; Epoxy: FM1000 Lot #6062-0004; Method(s): ASTM C 633-01 (2008) TABLE 3 — Summary of test data for this evaluation ID Counterface Material (hardness) Rider scan diameter, mm 52100 rider wear scar volume, cu. mm Counterface wear scar volume, cu. mm 1 4340 (42-44 HRC) 1.016 0.01661 0.00115 2 4340 (42-44 HRC) 0.889 0.00971 0.00041 3 420 SS coated 4340 (42-44 HRC) 0.762 0.00524 0.00014 4 420 SS coated 4340 (42-44 HRC) 0.762 0.00524 0.00016 Download Flyer CUSTOM COATINGS STAINLESS STEEL COATINGS Thermal sprayed stainless steel coatings are a practical, efficient way to protect essential components. Stainless steel is abrasive and corrosion resistant, and cost-effective when compared to other compounds. Applications that stainless steel is good for include shafts, cylinder linkers, crankshaft bearings, and most moving parts. Advantages High strength coating Low shrinkage High elongation Crack resistant on shafts Technical Specifications Material Composition: 13% Cr, .5% Si,.5% Ni, .5% Mn,.35% C, Balance Fe. Manufacturer product description: High chrome stainless steel, excellent wearing qualities, fair corrosion resistance, best all-purpose material for machine element work. Hardness: Rc 40-43 Bond Strength: 4000 – 6000 PSI Density: 85 – 95 % Wrought material Thickness Limitation: .100” TUNGSTEN CARBIDE COATINGS Tungsten carbide is a chemical compound of equal amounts of tungsten and carbon atoms. When it is in powder form, it is a gray color. One of the characteristics of tungsten carbide is it has a very high Mohs hardness level. Advantages Less than 1% Porosity High resistance to wear Hardness Exceeding Rc70 Corrosion-resistant Bonding Strength Average of 8,500psi Can be finished down to 6 Ra TRACTION COATINGS Traction coatings are used on rolls in the printing and papermaking industry to grab and feed paper. Because the traction of the coating depends substantially on the degree of its surface roughness, nearly any material can be used to create a traction coating. However, in most applications where a traction coating is required there is also a great amount of wear present and, therefore, the most common traction coating materials are carbides, stainless steels, and nickel alloys. Western Machine Works are experienced in the application of traction coatings to various types of rolls and rotating components. Traction coatings are used to increase coating integrity and customize surface textures, increase roll runnability, reduce downtime, and extend the service life of the equipment. WHERE CAN THERMAL SPRAY BE USED? Thermal spray coatings are used in various industries: Marine Pulp & Paper Wind Power Hydropower Steel Printing Food Processing Thermal Thermal spray has the following uses and applications: Bearing Fit Repairs Seal Fit Repairs Wear Resistance Corrosion Resistance Galling and Fretting Resistance THERMAL SPRAY COATING PROJECTS Minimize Downtime with 24/7 Rapid Response Achieve Peak Operating Performance Increase Your Engineering Resources Simplify Project Planning OUR ENGINEERS HAVE VAST EXPERIENCE WITH THE THERMAL SPRAY PROCESS The thermal spray process utilizes a 420 Stainless Steel coating material that performs well under compression and resists corrosion and erosion. The resulting bond strength, hardness, and coating integrity are suitable for applications in the wind & hydropower, marine, aerospace, and other critical heavy equipment industries. View technical sheet. Let’s talk about your project. REQUEST A QUOTE Let’s discuss how our project managers, engineers, and skilled team can help you with your equipment repair and engineering needs. 12005 N. Burgard Road Portland, OR 97203 (503) 286-7791 SERVICES Engineering Services Industrial Repair Precision Roll Grinding Thermal Spray Services Precision Grinding New Roll Manufacturing INDUSTRIES Industrial Equipment Wind Turbines HydroPower Pulp & Paper 24/7 Rapid Response Copyright © 2021 Western Machine Works, LLC • Privacy Policy • Sitemap