The regulator reduces the pressure of the welding gas from bottle pressure to about 15 psi
It also sets the flow rate, with a #5 nozzle you should be between 15 to 20 cfh, Insufficient
shielding gas will cause the arc to sputter and the weld to oxidize and burn up the tungsten.
When welding it is important to not be in a drafty area as it will blow away the shielding gas
and cause problems.
There is also a regulator with a different style flow meter, it is a column with a floating ball,
they work well and are more precise, but are more expensive.
When installing the regulator open the gas valve and let out a short blast of gas to clear the
connection, this keeps dirt from clogging the regulator. When you are done welding turn off
the gas valve on the bottle, if left on all the time you will lose your gas.
The Torch holds the tungsten electrode and nozzle cup. It has a regulator valve on it and
can be used to control gas flow. The HF welder has an automatic gas valve so the valve
on the torch should be fully open.
Collets are used to hold the tungsten in the torch, you need the proper size to fit the
tungstens you are using. They will deform after a while so having spares on hand is a
good idea. They are only about $2.00 ea.
The cups come in different sizes, #5 & #6 should cover all your welding needs, they also
are cheap have a couple extras on hand.