Kunststoffschweißtechnik
Starting and operating
Chapter 5
01.02.2012
Working Instructions WIDOS 2500 / OD 250
Page 18 of 45
5.5. Welding process
T h e r e s p e c t i v e l y v a l i d w e l d i n g p r e s c r i p t i o n s ( I S O / C E N / D V S . . . ) a r e t o
b e b a s i c a l l y f o l l o w e d .
•
Wear safety gloves as protection against combustion!
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A stop-watch must be available for recording the actual times for heating and cooling.
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A welding table must be available from which the parameters for the pipe dimensions to be
welded prescribed by the welding prescriptions may be taken.
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The heating element surfaces must be clean, especially non greasy, therefore they need to
be cleaned shortly before each welding or in case of dirtiness by means of a fiber-free paper
and a cleaning agent.
The anti-stick coating of the heating element is to be undamaged in the working area.
5.5.1.
How to align and clamp the pipes
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Screw the reduction inserts according to the pipe outside diameter to be welded.
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Align the pipe brackets according to the pipe outside diameter (chapter: 5.2).
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Open the clamping tools. Put the pipes with the same overhang to the inside of the clamping
tools.
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Close them and clamp pipes.
5.5.2.
How to plane the pipes
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Switch on the planer (chapter: 4.2, Nr. 8).
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Keep the button (no. 9) at the planer handle pressed.
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Drive workpieces to the planer with the cross handle and plane with low pressing force.
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You will have to carry out planing as long as a bilateral rotating chip has been produced.
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Open the support again, release button and swivel out the planer.
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Remove the produced cuttings without touching the worked surfaces.
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Close the support.
5.5.3. Mismatch compensation
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Check pipe mismatch and gap on the joining pipe ends. According to DVS 2207, the
mismatch on the pipe outer side must not exceed 0.1 x pipe wall thickness, the admissible
gap must not exceed 0.5 mm.
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The mismatch compensation is carried out by further tightening or releasing of the clamping
nuts. In case mismatch compensation was carried out, planing must be repeated afterwards.
