5 OPERATION
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6. Fit the tip adaptor and the gas nozzle.
7. Fit the welding torch on the power source.
a) Turn the connecting section counterclockwise until it resistance is met.
b) The wire guide should go in.
5.4 Gas nozzle
There is a spatter protector fitted inside the gas nozzle. This must be in position during
welding in order to prevent the welding spatter jamming and thereby causing a short circuit in
the swan neck.
Gas nozzles with larger and smaller openings are available as accessories for each type of
welding torch. See the "Wear parts" chapter.
5.5 Gas protection
Several factors are important for good gas protection. The most important are:
1. Selection of shielding gas. Mixed gas and Argon require a greater flow
than carbon dioxide.
2. Set flow quantity. See Technical data (to be measured at the
gas nozzle.)
3. Set welding current. High welding currents requires greater gas
flow.
4. Position of welding joint. A vertical position requires greater gas flow.
5. Type of welding joint. External corner joints require a greater gas
flow than butt joints. Conversely, fillet joints
require a lower gas flow.
6. Smoke evacuation on the welding torch. Using smoke evacuation increases the need
for inert gas by 10-12%.
7. Angle of welding torch to the job. Anling the welding torch at less than 45° may
result in poor gas protection.
5.6 Gas flow meter
A gas flow meter to measure gas flow through the welding torch is available as an accessory
see the "Accessories" chapter .
5.7 Centrovac
Integrated smoke evacuation
You can tailor the level of suction by opening the damper on the topside of the handle.
PSF 250C/PSF 315C LD
When welding in narrow positions it may be necessary to reduce the suction. This can be
achieved by opening the slots as shown below.
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