Design and function
Function specification
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099-510050-EW501
07.03.2022
5.7.2 Measuring the welding fume flow rate
• Setting values of the welding smoke flow rate
> see 8 chapter
.
• Calculate the welding smoke flow rate as a function of the altitude
> see 12.1 chapter
.
• Insert the welding fume extractor torch with the welding fume extraction nozzle installed vertically from
above as far as it will go into the nozzle holder of the airflow meter.
• The airflow meter must also be held with one hand at the top (green ticks).
• The intake opening at the bottom must not be covered by fingers or a hand (red cross).
• The minimum distance between the airflow meter and an object should be at least 50 cm / 19.7 in-
ches.
• The openings of the welding fume extraction nozzle must not be clogged and must be free of dirt.
• The openings of the extraction nozzle must be located completely inside the airflow meter and must
not be covered by the diaphragm grommet of the nozzle holder.
• Note the installation direction of the floater. The O-ring of the floater must point downwards.
• The welding fume extraction nozzle of the welding fume extractor torch must sit precisely in the airflow
meter.
• Close the bypass slider on the welding fume extractor torch.
• Switch on the filter and extraction system.
• The welding smoke flow rate is indicated at the centre of the O-ring of the floater, on the scale of the
airflow meter’s measuring tube.
• Readjust the welding fume flow rate on the controller of the extraction system until the specified value
Q
vn
and the displayed value match.
5.8 Function specification
5.8.1 General
A usable MIG/MAG welding torch consists of: Tube package, handle and torch neck with the relevant fit-
tings and consumable parts.
All elements together form a functional unit which, supplied with the relevant operating materials, genera-
tes an arc for welding. For welding, a wire electrode is fed through the tube package and the welding
torch. The arc and molten pool are shielded using inert gas (MIG) or active gas (MAG).
The wire electrode is a melting solid or cored wire which is conveyed through the contact nozzle. The
contact nozzle transfers the welding current onto the wire electrode. The arc is formed between the wire
electrode and workpiece. The welding torches are gas or fluid cooled depending on the version. The tube
package is equipped accordingly.
The torch button on the MIG welding torch is normally used for starting and stopping the welding process.
The operating elements on the UP/DOWN torch and POWERCONTROL torch provide additional func-
tions over and above those of a standard torch.
Removing the extraction nozzle during welding leads to a reduction in welding smoke capture. As
a result, the welding torch no longer conforms to the standard and the performance specifications
in the technical data.
