Term
| What are the four different thermal sprays coatings? |
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Definition
TWIN ARC
PLASMA non transferred arc
HVOC
DIFFUSION BONDING |
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Term
| Describe the twin arc thermal spray process. |
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Definition
| his process is often used for heavy coating build-up and salvage/repair applications, where very hard surfaces are required. In this example, we are rebuilding the journal surfaces of an agitator. Longevity's computer-controlled system ensures coatings of consistency and repeatability. |
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Term
Describe the PLASMA (NON-TRANSFERRED ARC)
process. |
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Definition
| re, a nitrogen hydrogen plasma plume is used to deposit a plasma coating of chromium oxide to a shaft. Because of the extreme temperatures reached with plasma, often up to 30,000°F, this process is ideal for high melting point materials such as chromium oxide, aluminum oxide, other ceramics as well as refractory materials. |
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Term
Describe the diffusion bonding
process. |
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Definition
| This process produces a fully dense hard surfacing with a metallurgical bond. In this example, a nickel chromium hard-facing alloy coating is being applied. A post-treatment will bring the coating to its plastic state and it will be densified in the process. |
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Term
| Describe the HVOF (High Velocity Oxygen Fuel) process. |
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Definition
| Today's standard for applying carbide and metal coatings. In our version of HVOF, the gases go through a converging diverging nozzle, with gas velocities reaching near 8000 fps. Use of this extremely high velocity torch produces coatings with near wrought densities and unsurpassed bond strength—which is particularly crucial when applying tungsten carbide coatings. |
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Term
| Describe the shot peening process. |
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Definition
| Used to improve the fatigue life of a metal, shot peening is when a metal is bombarded by tiny cermaic or metallic spheres in which induces a compressive stress. A bar only breaks from. So by putting both sides in compression, the applied force will have to overcome the compressive forces from SP before tension is induced in the system. |
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Term
| What are the different methods of non-destructive testing? |
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Definition
Magnetic particle inspection
Radiography
Ultrasonic Testing
Phase arrays
eddycant testing |
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Term
| Describe the magnetic particle testing. |
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Definition
| A NDT method used by spraying a ferromagnetic spray or applying an ink onto the specimen. Then a magnetic flux is used to run through the specimen. Once this is done, wherever the cracks are located, the flux will move to that area. |
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Term
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Definition
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