+GF+ SG 160 - Page 34

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