Opitimization on F.P.I. process and procedure for signaling lead pipe of anti-asthmatic presure

During the fluorescent penetrant inspection of signaling lead pipe of anti-asthmatic pressure, different F.P.I results for the parts can often be presented among the different production departments even the parts to be inspected have not been undertaken any procession. This paper aims to solve the above-mentioned problems and to analyze the reason of such different results by combining theoretical study with process examination. Some reasonable and effective methods based on the reason analysis were deduced.