Gas flow tester is a simple devise which helps accurately check and set the correct amount of gas required is being delivered at the torch outlet.
You simply place the Gas Flow Tester over the end of your MIG/TIG torch, press the welding torch trigger and adjust your gas regulator until you get the required flow rate is shown in the calibrated tube.
The general recommendations for Mig welding are around 7-12 litres per minute for mild steel solid wires, higher for stainless and aluminium at around 16-20 litres per minute and Tig welding around 6-12 litres per minute irrespective of the material.
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