Total Encapsulation

There are several methods used to totally encapsulate a screw with wear and/or corrosion-resistant material. The methods include detonation guns, high velocity oxygen fuel (HVOF) spray systems and various spray weld processes. A wide selection of materials can be used ranging from the types of materials used for flight hard-surfacing to customized products containing very hard wear resistant carbides.

As long as the screw and its coating is intact, the encapsulation process produces a superior solution to preventing adhesive, abrasive and/or corrosive wear. If the encapsulation is cracked or nicked, a rather rapid deterioration of the base metal can occur which encourages further “shelling off” of the encapsulation and, ultimately, severe wear of the screw. Encapsulated screws can be repaired but the process is rather difficult and somewhat expensive.

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