– Small gas holes or pinholes on the surface caused by trapped gases during pouring.
I can provide the precise alignment steps for your quality control process. Share public link mss sp 55 pdf
Often cited in purchasing specifications, MSS SP-55 ensures that castings are scrutinized for surface defects that could compromise pressure boundaries. Developed by the MSS Technical Committee 304, it provides a standardized, recognized method for acceptance or repair. How to Acquire the MSS SP-55 Document (PDF) – Small gas holes or pinholes on the