28
9.0
USE OF WELD HEAD ON PREHEATED PIPE.
If the Pipeliner Head and Guide Ring are to be used on preheated pipe, precautions may
be required to prevent damage for preheats of 95º C (200ºF) or lower, no special action
is required. For preheat higher (especially if preheat temp is to be over 150ºC (300ºF) it
is necessary to use an oversize Guide Ring and spacers (adaptors) to create additional
air spaces between the Guide Ring/weld Head and hot pipe surface. We recommend
using a Guide Ring which is oversized compared to the pipe OD by 10cm (4”) – using
5cm (2”) spacers (adaptors) attached to each of the square tubes of the Guide Ring.
This will increase the radial distance required for welding. We recommend that the
heating coils be wrapped with insulating material to minimize heating of the Head and
Guide Rings.
Содержание Pipeliner II 609A
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Страница 40: ...37 Undercutting 1 Reduce power 2 Reduce welding speed 3 Shorten arc length...
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Страница 46: ...43 14 0 ELECTRODE EXTENSION OFTEN NEGLECTED WHEN USING SELF SHIELDED CORED WIRES...
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Страница 49: ...46 15 0 PREVENTING THE EFFECTS OF MOISTURE CONTAMINATION OF FLUX CORE WIRE...
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