8 Fusion
Operating instructions SG 160
30
Feature
Description
Evaluation group
I
II
III
External state of joint
Welding flash too wide or too
narrow over part or all of weld
length, caused by, for example:
•
incorrect warming-up
time
•
incorrect heating-
element temperature
•
incorrect joint pressure
See pg.14
DVS 2202-1
guidelines
See pg.14
DVS 2202-1
guidelines
See pg.14
DVS 2202-1
guidelines
Non angular joint plane, leading
to variations in form of welding
flash over part or all of weld
length, caused by, for example:
•
edge preparation faults
•
incorrect welding unit
Permissible
if
b1≥ 0,7 x b2
Permissible
if
b1≥ 0,6 x b2
Permissible
if
b1≥ 0,5 x b2
Feature
Description
Evaluation group
I
II
III
Internal state of joint
No fusion or incomplete fusion
on joint faces, over part or the
whole of weld cross-section
caused by, for example:
•
contaminated joint faces
•
oxidized joint faces
•
excessive reversal time
•
heating element
temperature too low
•
heating element
temperature too high
Not
Permissible
Not
Permissible
Not
Permissible
Hollow space in joint planes
caused by, for example:
•
Insufficient joint pressure
•
Insufficient cooling time
Not
Permissible
Not
Permissible
Not
Permissible
Isolated, numerously dispersed
or locally concentrated pores or
inclusions
caused
by,
for
example:
•
Vapour formation during
welding
•
Contaminated heating
element
Permissible
if
∆
s
≤ 0.05 x s
Permissible
if
∆
s
≤ 0.10 x s
Permissible
if
∆
s
≤ 0.15 x s
Содержание SG 160
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