+GF+ SG 160, Instruction Manual

Page: 40 / 60

8 Fusion Operating instructions SG 160
36
8.2.3 Failure Analysis in Socket Fusion
Feature Description
Internal state of joint
Different bead formation or no bead
on one or both sides (over the entire
joint length or only a part). Possible
cause:
•
heating element temperature
too high
•
heating time too long
•
inadmissible tolerances
Different bead formation or no bead
on one or both sides (over the entire
joint length or only a part). Possible
cause:
•
heating time too short
•
heating element temperature
too low
•
inadmissible tolerances
Different bead formation or no bead
on one or both sides (over the entire
joint length or only a part). Possible
cause:
•
unworked fusion surface
•
soiled fusion surface
•
heating element temperature
too high
A pipe joined at an angle on one or
both sides to the fitting, with or
without some stress, for example
due to alignment error.
Distorted or oval-shaped pipe end
or fitting with local fusion pressure
being too low, for example. Possible
cause:
•
bend radius at collars too low
•
pipe/fitting incorrectly stored
•
clamped too hard in clamping
device