7. Istruzioni per una saldatura di tasca corretta

7.2 Fusion
7.2.1 Mark the pipe
Mark the pipe for depth of penetration into
the heater bush and fitting (see table).
The mark must remain visible under heating
and joining.
7.2.3 Joint pipe & fitting
Joint the pipe & the fitting and push the pipe
until it reaches the mark (that has to stay
outside).
During the jointing time the welded part of
pipe and fitting must remain fix, without any
rotation.
During the cooling time, the welded part of
pipe and fitting can be adjusted until cold.
7.2.2 Heat pipe & fitting
Push the pipe and the fitting into the heating
tools. Once pipe and fitting are hot (after the
correct time), pull out pipe and fitting very
slowly.
7.2.4 Fusion inspection
Fusion inspection.
The outer fusion seam must be inspected.
The seam must be present all around the
pipe.
Summary Value table
pipe minimum wall insert heating jointing cooling
diameter thickness depth time time time
(mm) (mm) (mm) (sec.) (sec.) (min.)
20 3,4 14 6 4 2
25 4,2 16 7 4 3
32 5,4 18 8 6 4
40 6,7 20 12 6 4
50 8,4 23 18 6 5
63 10,5 26 25 8 6
75 12,5 28 30 8 8
90 15,0 31 40 10 8
110 18,4 33 50 10 8
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