Repair of base material defect after HVOF Coating

[Pranab_hvof]

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.

[Johnny_Blaze]

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

[sushil1405]

Hi Team,

I suggest to go for Conforma clad seat and valve ball.It will be metallurgical bond and can be machined also.
Please reach out to us.

Regards


Sushil Kumar
Business Development Manager-India
sushil.kumar@kennametal.com
T :+918022198226
M :+919780891405,
Kennametal India Limited, | CIN: L27109KA1964PLC001546
Kennametal India Limited, 8-9th Mile, Tumkur Road, Bangalore-560073 Karnataka-India www.kennametal.com
Kennametal® manufactures sophisticated alloys in the form of castings, powders, coatings, consumables, and machined parts that resist wear, corrosion, and abrasion