国产剧情AV麻豆香蕉精品,国产女人A级毛片18视频,人妻丰满熟人熟妇av无码,久久99国产精品9床震网站

Steel welding requirements

Steel welding requirements:

1 welder
Remember:
Foshan Steel engaged in steel welder welding work passed an examination and obtain a certificate. Welders welding must pass the examination within the project and its scope of accreditation.
For already parting press metallurgy, electric power, shipbuilding, boiler and pressure vessel industry qualification examination required to obtain a basic welder, you can remove the corresponding items of basic exam, otherwise should be "welded steel construction Technical Specification" (JGJ81) require appropriate qualifications exam.
(2) non-destructive testing full penetration of the design requirements of a secondary weld ultrasonic testing should be used to check for internal defects, remember:
When ultrasonic testing can not make judgments on the shortcomings should be used in radiation detection, classification and testing its internal shortcomings approach should fit the current national standards.