Mixing Gas In An Old Cylinder
(Bay Area, CA.)
MIG Gas Cylinder Mixing Gases Through Convection In The Sun.
I bought an nice Miller MIG welder from an older guy who cant weld anymore for health reasons. It came with a gas cylinder that is full. The mixture is 75% Argon, 25% C02. But he said that it's been in his garage for years without use. He said I should mix the gases since C02 is heavier than Argon, and since it hasn't been used for so many years.
He mentioned rolling it around on the ground. But I was with an old Airgas engineer and he told me that one of his guys back in the day would leave the old cylinders with Argon and/or C02 in them out in the sun because the heat created a natural convection flow inside the cylinder and it mixed the gases naturally that way. He said 4 hours is about good enough to mix them up.
The picture above is my cylinder getting that convection going. What do you think?