Fronius MTG 250i Instructions De Service page 22

The following components are responsible, amongst other things, for the degree of toxi-
city of welding fumes:
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The relevant material safety data sheets and manufacturer's specifications for the listed
components should therefore be studied carefully.
Recommendations for trade fair scenarios, risk management measures and for identify-
ing working conditions can be found on the European Welding Association website under
Health & Safety (https://european-welding.org).
Flammable vapours (e.g. solvent fumes) should be kept away from the arc's radiation
area.
Close the shielding gas cylinder valve or main gas supply if no welding is taking place.
Risks from wel- An electric shock is life threatening and can be fatal.
ding current
Do not touch live parts either inside or outside the device.
During MIG/MAG or TIG welding, the welding wire, the wirespool, the drive rollers and all
metal parts that are in contact with the welding wire are live.
Always set the wire-feed unit up on a sufficiently insulated surface or use a suitable,
insulated wire-feed unit mount.
Make sure that you and others are protected with an adequately insulated, dry temporary
backing or cover for the earth or ground potential. This temporary backing or cover must
extend over the entire area between the body and the earth or ground potential.
All cables and leads must be complete, undamaged, insulated and adequately dimensio-
ned. Loose connections, scorched, damaged or inadequately dimensioned cables and
leads must be repaired/replaced immediately.
Do not sling cables or leads around either the body or parts of the body.
The electrode (rod electrode, tungsten electrode, welding wire, etc) must
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Double the open circuit voltage of a welding machine can occur between the welding
electrodes of two welding machines. Touching the potentials of both electrodes at the
same time may be fatal under certain circumstances.
Switch off unused devices.
Meandering wel- If the following instructions are ignored, meandering welding currents can develop with
ding currents the following consequences:
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Ensure that the workpiece is held securely by the workpiece clamp.
Attach the workpiece clamp as close as possible to the area that is to be welded.
Position the device with sufficient insulation against electrically conductive environments,
e.g. Insulation against conductive floor or insulation to conductive racks.
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Metals used for the workpiece
Electrodes
Coatings
Cleaners, degreasers, etc.
Welding process used
never be immersed in liquid for cooling
never be touched when current is flowing.
Fire hazard
Overheating of parts connected to the workpiece
Irreparable damage to ground conductors
Damage to device and other electrical equipment