Operating instructions SG 160
8 Fusion
37
Feature
Description
Internal state of joint
Insufficient fusion joint length with
completely or only partially melted
fusion surface. Possible cause:
•
heating time too short
•
pipe ends not right-angled
•
heating element
temperature too low
•
pipe/fitting slipping away
•
change-over time too long
Jointing error with insufficient form-
locking Local, axially on surface or
circular
formation
of
channel.
Possible cause:
•
notches in the pipe surface
•
diameter tolerance of pipe
or fitting exceeded
•
incorrect mechanical
working
•
pipe not aligned with
fitting
Compressed
pipe
cross-section
during heating or fusion. Possible
cause:
•
fusion pressure too high
•
fusion of thin-walled pipes
•
heating time too long
•
fusion temperature too
high
Pores due to foreign substances
Single, very widespread or local
concentrations
of
pores
or
inclusions. Possible cause:
•
vapors formed during
fusion (water, solvents)
•
soiled heating element
Содержание SG 160
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