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5.4 Contact nozzles
Contact nozzles are selected according to electrode diameter, type of buffer gas and
the strength of the current being used. See table on page 118.
The contact nozzles are initially selected with the guidance of the CO2table. If
seizing occurs in the event of high welding data with Argon or mixed gas, select on
the basis of the MIX, AR table.
For HELIX, the table applies regardless of buffer gas type. HELIX contact nozzles
must be combined with a special nozzle, see spare parts list. Note that the item
number for HELIX includes 2 contact nozzles + 1 locking nut for installation.
5.5 Electrode holder
In order to achieve good welding rod feed, the welding rod guide should be selected
in accordance with the table on page 119. A Teflon--based welding rod guide
produces less friction and is kinder to the electrode, but normally has a shorter
service life than a steel spiral. It is suitable for all types of electrode, except for the
majority of core wire types thicker than 1.2 mm.
Steel spirals can be used for all except for stainless steel and aluminium electrodes.
For changing electrode guides – see the enclosed instructions.
Note! All welding guns are supplied with electrode guides. Steel spiral for welding
rod ∅1.0.
5.6 Gas nozzles
If you want a gas nozzle with a smaller opening diameter, this is available as an
accessory for each gun. See the spare parts list. Note that it is also possible to
exchange the connector type.
IMPORTANT! There is a spray guard in the gas nozzle. This must be in place to
prevent welding spray penetrating the connector.
For good function, the gas nozzle must always be screwed in as far as it will go.
5.7 Gas protection
Several factors combine to provide good gas protection. The most important of these
are:
1. Choice of buffer gas. -- Mixed gas and argon require a greater flow than carbon
dioxide
2. Set flow quantity. -- See technical data (should be measured at the gas nozzle).
3. Set welding current. -- High current requires a greater gas flow.
4. Position of the welding joint. -- A vertical position requires a greater gas flow.
5. Type of welding joint. -- An outer corner joint requires a greater gas flow than a
butt joint. A fillet weld joint requires a correspondingly smaller gas flow.
6. The angle of the welding gun against the workpiece. Below 45°entails a risk of
poor gas protection.
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