Failure Analysis - GF ECOS 160 Bedienungsanleitung

Operating instructions ECOS 160/250/315
External state of joint
9

Failure analysis

Feature Description
Cracks running length-wise or
cross-wise to weld. They may
be located:
In the weld
•
In base material
•
In heat affected zone
•
Continuous or local notches
length-wise to weld with notch
root in base material, caused
by, for example:
Insufficient joint
•
pressure
Warming-up time too
•
short
Cooling time too short
•
Notches in edge of
material, length-wise or cross-
wise to weld, caused by, for
example:
Clamping tools
•
Incorrect transport
•
Fault in edge
•
preparation
Joint faces are displaced relative
to one another or thickness
variations are not adjusted
For example:
- Machine fault
•
- layout fault
•
Excessive and sharp edged
welding flash over part all of
weld length or weld girth due to
wrong welding parameters,
especially caused by
excessive joint pressure with
polyolefin's only
Evaluation group
I II
Not Not
Permissible Permissible
Not Not
Permissible Permissible
base Locally Locally
permissible permissible
if ending if ending
flat and flat and
∆s ≤ 0.1s ∆s ≤ 0.1s
but max . but max . 1
0.5mm mm
Permissible Permissible
if if
e ≤0.1s but e≤0.15s but
max 2 mm max 4 mm
Permissible Permissibile
if if
e ≤1 mm e ≤ 2 mm
Not Not
Permissible Permissible
an
9 Failure analysis
III
Not
Permissible
Not
Permissible
Permissible
if ending
flat and
∆s ≤ 0.15s
but max .
5mm
Permissible
if
e≤0.2s but
max 5 mm
Permissibile
if
e ≤ 4 mm
Not
Permissible
23