The correct gas flow rate is crucial for reliable shielding gas coverage and thus for the quality of the weld seam. A flow rate that is too low leads to inadequate protection and porosity, while a flow rate that is too high can cause turbulence and also impair the shielding effect. The optimal setting depends on the welding process used and the wire or gas nozzle diameter. Below you will find the adjustment methods and rule of thumb for MIG-MAG-welding.
Setting the Gas Flow Rate
Shielding gas is only required when welding with solid wire, rutile, and metal powder flux-cored wire. When welding with self-shielding flux-cored wire, you can skip this step.
The gas flow rate is displayed on the flow meter of the pressure regulator. The pressure in the gas cylinder is shown on the content pressure gauge.
Setting the Gas Flow Rate Using the Torch Button
Danger from protruding wire electrode.
As soon as the wire electrode contacts the contact tip, an arc can be ignited by touching conductive objects. An unintentionally ignited arc can cause serious injuries and damage objects. Furthermore, the wire electrode may pierce body parts when protruding from the torch.
Make sure to hold the torch so that the wire electrode does not contact electrically conductive objects and is not directed towards people.
- Open the gas valve of the gas cylinder.
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Press and hold the torch button while adjusting the gas flow rate using the adjustment screw on the pressure regulator. Use the following rule of thumb:
- MIG welding: Wire diameter [mm] x 13.5 = Gas flow rate [l/min]
- MAG welding: Wire diameter [mm] x 11.5 = Gas flow rate [l/min]
Setting the Gas Flow Rate Using the Software Function (Gas Test)
- Ensure that the welding process is set to “MIG”.
- Open the gas valve of the gas cylinder.
- Press the “Gas check” button on the control panel to open the solenoid valve of the power source and start the gas test.
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Adjust the gas flow rate using the adjustment screw on the pressure regulator. Use the following
rule of thumb:
– MIG welding: Wire diameter [mm] x 13.5 = Gas flow rate [l/min]
– MAG welding: Wire diameter [mm] x 11.5 = Gas flow rate [l/min] - Press the “Gas check” button on the control panel again to close the solenoid valve and end the gas test.
You now know how to set the gas flow rate. If you would also like to learn about the suitable types of shielding gas in advance, feel free to visit our article Which Shielding Gas for Which Welding Process?
Detailed information on operation and further instructions for handling RED devices can be found in the respective operating manual of your welding machine.