22 years of secondary construction engineer mechanical and electrical engineering core points after welding inspection, second construction excellent student notes

2022-06-25 0 By

22 years of secondary construction engineer mechanical and electrical engineering core points after welding inspection, the second construction of outstanding student notes, long press like + forward + evaluation continue to update oh, the version of my profile picture private letter me: 2022 (a) visual inspection 2.For direct visual inspection, sufficient space for human eyes to observe should be provided within 600mm of the surface to be inspected, and the inspection Angle of view should not be less than 30°.When this can not be met, indirect visual detection should be carried out by using mirrors, endoscopes, optical fiber cables and cameras.(2) Nondestructive testing 1. Nondestructive testing methods for welded joint surfaces usually refer to magnetic particle testing and penetrant testing;Internal nondestructive testing methods are usually radiographic testing and ultrasonic testing.(3) heat treatment 1. For the local heating heat treatment of the weld, should check and record the heating rate, cooling rate, constant temperature and constant temperature time, temperature difference between any two temperature measuring points and heating area width.2. The effect of heat treatment of weld shall be checked according to the inspection method stipulated in the design document or the current national standard.Local heat – treated welds should be tested for hardness.3. When the heat treatment effect is unqualified or the heat treatment record curve is abnormal, other testing methods (metallographic analysis or residual stress test) should be used for reexamination or evaluation.