Gas direction

[Psymon]

Ok knowing that most shielding gas is heavier than air which is the best torch position for each gas is it always aiming from the top down? What happens to the gas when you weld something above or uphill? Does it fall away really quickly from the nozzle or not? Should you have the torch shroud really close to the work or do you need to turn up the gas LPM? And does the same theory work for ar/co2 or co2, ar. What about Helium mixtures? (not that I would use it but maybe useful to others)

 

[Glenn1968]

MIG/MAG welding should be around 15l/min - position of the torch will have no effect on the gas, but will have an effect on the weldpool - i.e overhead you could end up wearing more weld than you put down!

TIG welding flow rates are 4 - 8l/min

Helium mixtures need ahigher flowrate as helium molecules are smaller and flowmeters read incorrectly for those mixtures - as a rule of thumb if you want 15l/min in helium mixtures, set your flowmeter to 20/22l/min.