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
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