Penetrants Check and HVOF ,which process should be first ?
Penetrants Check and HVOF ,which process should be first ?
(OP)
Our parts need to be checked for using penetrants and coated by HVOF,but we don't know which one should be first?Penetrants Check is for base material or coated material?Thanks!





RE: Penetrants Check and HVOF ,which process should be first ?
I am assuming that the penetrant check is to detect surface cracks. If this is true, then the penetrant must be used and read prior to coating. The coating will obscure surface defects, and render the penetrant test useless.
RE: Penetrants Check and HVOF ,which process should be first ?
RE: Penetrants Check and HVOF ,which process should be first ?
The first step in the HVOF process is to roughen up the surface with a 60 grit Aluminum Oxide blast. This in itself would make Penetrant examination impossible. The whole point of the inspection is to assure the quality of the base material prior to covering it up. Hope this helps.
Sincerely,
DJ Kallhof
Quality Engineer
NDT Level III