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Repair of base material defect after HVOF Coating



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Repair of base material defect after HVOF Coating
04-07-2015, 02:42 AM,
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Pranab_hvof Offline
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Video  Repair of base material defect after HVOF Coating
Hi everyone..

We do HVOF coating for Valve ball & seats. Recently, one we faced an issue of surface defect of base material. A pin hole was observed during grinding operation of ball, which we could not notice after blasting/during coating.

The blow hole is very near to sealing area & will affect the performance in terms of leakage, or may result in coating pill off during hydro testing & cycling of valve.

Is there any method to seal/ repair the porosity, without having to go for stripping?

Please guide.
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06-20-2015, 06:45 PM,
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Johnny_Blaze Offline
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RE: Repair of base material defect after HVOF Coating
(04-07-2015, 02:42 AM)Pranab_hvof Wrote: Hi everyone..

We do HVOF coating for Valve ball & seats. Recently, one we faced an issue of surface defect of base material. A pin hole was observed during grinding operation of ball, which we could not notice after blasting/during coating.

The blow hole is very near to sealing area & will affect the performance in terms of leakage, or may result in coating pill off during hydro testing & cycling of valve.

Is there any method to seal/ repair the porosity, without having to go for stripping?

Please guide.


Hi Pranab,
Did you find an answer to this problem?

Regards,
John
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