For basic bench soldering, setting the gas and oxygen pressure
between 2-5 lbs should be fine. Too much pressure, and they will be
difficult to adjust for a soft or neutral flame. Higher pressures may
be necessary for melting metal, but I prefer to melt only the solder
when I'm joining metal
If your regulators won't hold a steady pressure when set that low,
you may have a WELDING set. You need to take them to a welding shop
and have them sent out to have LOW PRESSURE DIAPHRAGMS installed. It
will make a huge difference.
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