3atv002国产在线精品_亚洲性爱视频久久_91亚洲中文天堂在线观看_欧美色精品视频在线观看_亚洲高清无码久久久

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.