EN 
ES
PT
SV
DE
TR
FR
Weld metal bellows spring and break mechanical seal leakage
Time : 2019-07-26 Hits : 277
Fracture, spring fracture is also one
of the main forms of spring failure. According to the properties of
spring load, the working environment and fracture modes are fatigue
fracture, stress corrosion cracking and overload fracture.
The
cause of fatigue fracture of spring or metal bellows mostly belongs to
fatigue crack expansion caused by improper design, material defect,
manufacturing and poor working condition. The fatigue crack often result
in high stress area, such as the inner surface of the compression
spring is broken, often enter the direction angle and 45 degree angle of
outer surface and fracture with spring material; metal corrugated pipe
fracture often appear in the bellows groove.
Welded
metal bellows can produce greater stresses if they are made by defects,
such as wave plate spacing, and rupture of these wave plates in some
waves. Manufacturing defects are irregular wave plate spacing, wave
depth range, and different slice thickness. Install static metal bellows
mechanical seals that may be connected to the state and defects at the
bearing point due to glands. The defect will also cause stress in the
wave plate and rupture.
In
many cases, the periodic shrinkage frequency of welded metal bellows is
equal to the natural frequency of the sealing device, which may
resonate and cause greater stress, leading to early fatigue.
