Design and function
Gas supply (shielding and plasma gas)
099-008232-EW501
26.05.2020
15
Welding current
Eye protection filter
< 1 A
Level 5
1 to 2.5 A
Level 6
2.5 to 5 A
Level 7
5 to 10 A
Level 8
10 to 15 A
Level 9
> 15 A
Level 10
5.7 Gas supply (shielding and plasma gas)
WARNING
Risk of injury due to improper handling of shielding gas cylinders!
Improper handling and insufficient securing of shielding gas cylinders can cause seri-
ous injuries!
• Observe the instructions from the gas manufacturer and any relevant regulations concern-
ing the use of compressed air!
• Do not attach any element to the shielding gas cylinder valve!
• Prevent the shielding gas cylinder from heating up.
Allow the plasma gas to flow through the welding torch for a few minutes to blow out any moistu-
re. This prevents ignition problems.
Using the special welding torch caps prevents the penetration of air humidity during longer
breaks (overnight, weekend).
5.7.1 Hydrogen
Follow the safety precautions below to exclude the risk of explosion during plasma welding with hydrogen
in the gas mixture:
1. Pipes, hoses, screw connections and machines through which gases flow must be gas-tight and kept
that way. Therefore, it is necessary to check the leak-tightness at regular intervals (weekly) with a leak
detection spray or soapy water.
2. A ceiling-mounted extraction system is recommended.
3. Set up the gas cylinders only in a place where no flying sparks can occur (even during the connec-
tion). The gas cylinder must be secured against falling over.
4. The connection nozzles of the gas cylinder valves and that of the pressure regulator must not be di-
rected towards other gas cylinders.
5. Unused manometers for gas quantity must remain closed during welding.
6. After the welding has been completed, close the gas cylinder valves, depressurise the pressure regu-
lator and disconnect the system from the mains.
5.7.2 Plasma gas
Figure 5-6
Item Symbol Description
0
1
Pressure regulator
2
Output side of the pressure regulator
3
Shielding gas cylinder
4
Cylinder valve
